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Numerical analysis of water-alternating-CO_(2) flooding for CO_(2)-EOR and storage projects in residual oil zones 被引量:1
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作者 Boyu Liu Jun Yao Tunan Sun 《International Journal of Coal Science & Technology》 EI CAS CSCD 2023年第5期1-11,共11页
Residual oil zones(ROZs)have high residual oil saturation,which can be produced using CO_(2) miscible flooding.At the same time,these zones are good candidates for CO_(2) sequestration.To evaluate the coupled CO_(2)-E... Residual oil zones(ROZs)have high residual oil saturation,which can be produced using CO_(2) miscible flooding.At the same time,these zones are good candidates for CO_(2) sequestration.To evaluate the coupled CO_(2)-EOR and storage perfor-mance in ROZs for Water-Alternating-CO_(2)(WAG)flooding,a multi-compositional CO_(2) miscible model with molecular diffusion was developed.The effects of formation parameters(porosity,permeability,temperature),operation parameters(bottom hole pressure,WAG ratio,pore volume of injected water),and diffusion coeffcient on the coupled CO_(2)-EOR and storage were investigated.Five points from the CO_(2) sequestration curve and the oil recovery factor curve were selected to help better analyze coupled CO_(2)-EOR and storage.The results demonstrate that enhanced performance is observed when formation permeability is higher and a larger volume of water is injected.On the other hand,the performance diminishes with increasing porosity,molecular diffusion of gas,and the WAG ratio.When the temperature is around 100℃,coupled CO_(2)-EOR and storage performance is the worst.To achieve optimal miscible flooding,it is recommended to maintain the bottom hole pressure(BHP)of the injection well above 1.2 minimum miscibility pressure(MMP),while ensuring that the BHP of the production well remains sufficiently high.Furthermore,the tapered WAG flooding strategy proves to be profitable for enhanced oil recovery,as compared to a WAG ratio of 0.5:1,although it may not be as effective for CO_(2) sequestration. 展开更多
关键词 Residual oil zone WAG injection Carbon sequestration Enhanced oil recovery Injection strategies
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Reservoir heterogeneity controls of CO_(2)-EOR and storage potentials in residual oil zones:Insights from numerical simulations 被引量:1
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作者 Yan-Yong Wang Xiao-Guang Wang +4 位作者 Ren-Cheng Dong Wen-Chao Teng Shi-Yuan Zhan Guang-Yong Zeng Cun-Qi Jia 《Petroleum Science》 SCIE EI CSCD 2023年第5期2879-2891,共13页
Residual oil zones(ROZs)have large potential for CO_(2)enhanced oil recovery(EOR)and geologic storage.During CO_(2)injection,the migration of CO_(2)in ROZs controls the performance of both EOR and storage.However,it h... Residual oil zones(ROZs)have large potential for CO_(2)enhanced oil recovery(EOR)and geologic storage.During CO_(2)injection,the migration of CO_(2)in ROZs controls the performance of both EOR and storage.However,it has not been clearly visualized and understood that how geological heterogeneity factors control the transport of CO_(2)in ROZs.In this study,the oil recovery performance and geologic storage potential during continuous CO_(2)injection in a representative ROZ are studied based on geostatistical modelling and high-fidelity three-phase flow simulation.We examined the influence of autocorrelation length of permeability,global heterogeneity(DykstraeParsons coefficient),and permeability anisotropy on cumulative oil recovery and CO_(2)retention fraction.Simulation results indicate that,as the permeability autocorrelation length increases,the cumulative oil recovery and CO_(2)storage efficiency decrease.This results from the accelerated migration of CO_(2)along high permeability zones(i.e.,gas channeling).The increase in global heterogeneity and permeability anisotropies can lead to low oil recovery and poor CO_(2)sequestration performance,depending on the degree of CO_(2)channeling.The net utilization ratio of CO_(2)(CO_(2)retained/oil produced)unfavorably increases with both autocorrelation length and Dykstra eParsons coefficient,but decreases with the increase in kv/kh.Such a decrease is attributed to enlarged swept volume induced by gravity override.The study provides important implications for fieldscale CO_(2)EOR and storage applications in ROZs. 展开更多
关键词 Residual oil zones CO_(2)injection Enhanced oil recovery Geologic sequestration
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Preservation Potentials of Essential Oils of Ocimum basilicum and Ocimum gratissimum from Two Agro-Ecological Zones on Freshwater Smoke-Dried Oreochromis niloticus Fish Sold in Some Local Markets in Cameroon
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作者 Tsi Celestine Angu Pride Ndasi Ngwasiri +2 位作者 Lifoter Kenneth Navti Diane Youmbi Yimta Fonteh Florence Anyanwe Angaba 《Advances in Biological Chemistry》 2023年第5期192-207,共16页
Dried fish are susceptible to bacteria and fungi attack and are liable to chemical changes which cause losses in quality and reduction of shelf-life. It is important therefore to maintain the quality of fish because c... Dried fish are susceptible to bacteria and fungi attack and are liable to chemical changes which cause losses in quality and reduction of shelf-life. It is important therefore to maintain the quality of fish because continuous consumption of contaminated fish and their products may predispose consumers to health hazards. Maintenance of high quality fish therefore calls for adequate and effective preservation techniques. The study examined the effectiveness of essential oils of Ocimum basilicum and Ocimum gratissimum from two Agro-ecological zones of Cameroon in limiting the microbial proliferation and preserving the quality of smoke-dried Oreochromis niloticus fish stored at 25˚C for two months. The plant materials were harvested from the Western Highlands and Monomodal Humid Forest agroecological zones of Cameroon. Extraction of the essential oil from the plants was done by hydro-distillation. The fish species (Oreochromis niloticus) used in this study was chosen based on a survey study on the most consumed species of freshwater smoke-dried fish in the Western Highlands and Monomodal Humid Forest Agro-ecological zones of Cameroon. Heterotrophic bacteria counts, fungi counts and Enterobacteriaceae counts were used to assess the level heterotrophic bacteria, fungi and Enterobacteriaceae respectively in the fish samples during storage and were done by culture techniques using total plate count agar, potato dextrose agar and violet red bile glucose agar respectively. Total volatile basic nitrogen, peroxide value, and thiobarbituric acid reactive substance assays were used as spoilage indices to assess the nutritional quality of the fish during storage. From the survey study, Oreochromis niloticus was the most consumed smoke-dried fish in the Western Highlands (35.45%) and Monomodal Humid Forest (34.55%) agroecological zones. All the EOs caused a significant reduction in the microbial loads, total volatile basic nitrogen, peroxide value, and thiobarbituric acid reactive substance of smoke-dried Oreochromis niloticus as storage progressed. However, the reduction in these values was more pronounced in samples treated with essential oils of O. gratissimum from the Western Highlands, with heterotrophic bacteria, fungi and Enterobacteriaceae counts being 5.89, 6.97 and 4.59 log<sub>10</sub> cfu/g respectively at the end of the storage period. This was followed by essential oils of O. gratissimum from the Monomodal Humid Forest with heterotrophic bacteria, fungi and Enterobacteriaceae counts being 6.11, 7.79 and 4.86 log<sub>10</sub> cfu/g respectively at the end of the storage period. Also, essential oils of O. gratissimum from the Western Highlands was more effective in preserving the fish quality as lowest total volatile basic nitrogen (12.29 mg/100g), peroxide value (2.79 mEq O<sub>2</sub>·Kg<sup>−1</sup>) and thiobabituric reactive substance (1.695 mg MDA/Kg) values were observed for fish samples treated with this extract at the end of the storage period. This was followed by essential oils of O. gratissimum from the Monomodal Humid Forest with total volatile basic nitrogen (14.95 mgN/100g), Peroxide value (3.23 mEq O<sub>2</sub>·Kg<sup>−1</sup>) and thiobabituric reactive substance (2.354 mg MDA/Kg) at the end of the storage period. From the results obtained, essential oils from O. gratissimum were more effective than that from O. basilicum in the two agroecological zones and should be considered as natural alternative to chemical preservatives for further application in food preservation. 展开更多
关键词 Oreochromis niloticus Essential oils Fish Quality Ocimum basilicum Ocimum gratissimum Agro-Ecological zone
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Logging-based assessment of low-resistivity oil zones:A case study from Sudan
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作者 Li Chunmei Wu Furong +3 位作者 Zang Dianguang Peng Cai Guo Hongxi Li Jie 《Energy Geoscience》 2023年第2期82-90,共9页
The reservoirs in the N oilfield in Sudan feature a complex sedimentary environment,which has led to a widespread development of low-resistivity oil zones,accounting for as high as 37%of the total oil zones.In this ca... The reservoirs in the N oilfield in Sudan feature a complex sedimentary environment,which has led to a widespread development of low-resistivity oil zones,accounting for as high as 37%of the total oil zones.In this case,a large number of oil zones will be misinterpreted using conventional methods.Based on the analysis of the core data and logging curves of the study area,this study concludes that the lowresistivity oil zones are formed mainly due to the high irreducible water saturation caused by the high content of illite and smectite and complex pore structure,the additional electrical conductivity induced by clay minerals,and the difference in formation water salinity between the oil zones and water zones.Furthermore,four methods are proposed to qualitatively identify these oil zones and water zones,namely the relationship analysis of five reservoir properties,cross-plotting of sensitive parameters,analysis of pressure testing data,and multi-well correlation.Furthermore,the study quantitatively calculates the initial oil saturation using the capillary pressure data,thus avoiding the conventional empirical saturation formulas depending on electrical resistivity and solving the difficulty in calculating oil saturation of low-resistivity oil zones.Finally,precise logging processing and interpretation of 95 wells in the study area are conducted using the above-mentioned comprehensive assessment system for low-resistivity oil zones.As a result,59 oil zones are newly discovered in 43 wells.Moreover,it is recommended that 17 oil zones in 12 wells should be tested,of which 11 oil zones have been tested as recommended,all proven to be high production oil zones after perforation.The coincidence rate of logging interpretation increases from 75%to 94.3%,and the original oil in place(OOIP)increases by 57.42 million barrels.All these indicate that the assessment system proposed is suitable for low-resistivity zones. 展开更多
关键词 Low-resistivity oil zone Cause analysis Qualitative identification J-function Saturation
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Definition and Classification of Low-Resistivity Oil Zones 被引量:4
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作者 LIU Shuang-lian LIU Jun-lai +1 位作者 LI Hao ZHOU Yong-sheng 《Journal of China University of Mining and Technology》 EI 2006年第2期228-232,共5页
Although the analysis of the microcosmic mechanism for low-resistivity oil zones has received much attention in China, the intrinsic relationship between low-resistivity oil zones and geological background is still un... Although the analysis of the microcosmic mechanism for low-resistivity oil zones has received much attention in China, the intrinsic relationship between low-resistivity oil zones and geological background is still under-developed. Based on the geology and logging analysis, we redefine low-resistivity oil zones. According to their genesis, low-resis- tivity oil zones can be distinguished as five different classes: low-resistivity oil zones formed by tectonic settings, by depositional settings, by diagenetic settings, by invaded settings and those which are formed by the compounding geneses respectively. We make the following observations from this study on the definition and classification of low-resistivity oil zones: 1) A low-resistivity oil reservoir has macroscopic and microscopic unity. 2) The genesis of low-resistivity oil zones varies with the type of petroliferous basin. 3) Some low-resistivity oil zones can be forecasted based on the geological study results. 4) The results in this paper suggest that well logging information is generated from two cause mechanisms, the geophysical factors and the geological setting. Future studies on the geological background cause mechanism and the theory of well logging information will enrich the theory of logging geology and improve the ability to forecast oil zones. 展开更多
关键词 low-resistivity oil zone geologic background GENESIS classification
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Oil source and migration process in oblique transfer zone of Fushan Sag,northern South China Sea 被引量:1
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作者 王观宏 王华 +3 位作者 甘华军 时阳 赵迎冬 陈善斌 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第3期654-668,共15页
The oblique transfer zone in the Fushan Sag, a syndepositional dome sandwiched between the Bailian and Huangtong sub-sags, has been the most important exploration target. The major oil observation occurs in the E_2l_1... The oblique transfer zone in the Fushan Sag, a syndepositional dome sandwiched between the Bailian and Huangtong sub-sags, has been the most important exploration target. The major oil observation occurs in the E_2l_1^(L+M) and the E_2l_3~U. 46 oil and rock samples reveal that the oil in the transfer zone is mostly contributed by the Bailian sub-sag, though the source rock conditions, hydrocarbon generation and expulsion histories of the Bailian and Huangtong sub-sags are similar. The E_2l_3~U oil, characterized by high maturity, Pr/Ph ratio and oleanane/C_(30)-hopane ratio, shows a close genetic affinity with the E_2l_3~b source rocks, while the E_2l_1^(L+M) oil, characterized by lower maturity, Pr/Ph ratio and oleanane/C_(30)-hopane ratio, is suggested to be derived from the E_2l_(1+2)~b source rocks. The homogenization temperatures of aqueous fluid inclusions, taking the burial history of the reservoirs into account, reflect that the oil charge mainly occurred from mid-Miocene to Pliocene in the oblique transfer zone. The oil transporting passages include connected sand bodies, unconformities and faults in the Fushan Sag. Of these, the faults are the most complicated and significant. The faults differ sharply in the west area, the east area and the oblique transfer zone, resulting in different influence on the oil migration and accumulation. During the main hydrocarbon charge stage, the faults in the west area are characterized by bad vertical sealing and spatially dense distribution. As a result, the oil generated by the Huangtong source rocks is mostly lost along the faults during the vertical migration in the west area. This can be the mechanism proposed to explain the little contribution of the Huangtong source rocks to the oil in the oblique transfer zone. Eventually, an oil migration and accumulation model is built in the oblique transfer zone, which may provide theoretical and practical guides for the oil exploration. 展开更多
关键词 oblique transfer zone oil-source correlation oil loss oil migration and accumulation model Fushan Sag
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Development and prospect of separated zone oil production technology 被引量:2
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作者 LIU He ZHENG Lichen +4 位作者 YANG Qinghai YU Jiaqing YUE Qingfeng JIA Deli WANG Quanbin 《Petroleum Exploration and Development》 2020年第5期1103-1116,共14页
This article outlines the development of separated zone oil production in foreign countries,and details its development in China.According to the development process,production needs,technical characteristics and adap... This article outlines the development of separated zone oil production in foreign countries,and details its development in China.According to the development process,production needs,technical characteristics and adaptability of oilfields in China,the development of separate zone oil production technology is divided into four stages:flowing well zonal oil production,mechanical recovery and water blocking,hydraulically adjustable zonal oil production,and intelligent zonal production.The principles,construction processes,adaptability,advantages and disadvantages of the technology are introduced in detail.Based on the actual production situation of the oilfields in China at present,three development directions of the technology are proposed.First,the real-time monitoring and adjustment level of separated zone oil production needs to be improved by developing downhole sensor technology and two-way communication technology between ground and downhole and enhancing full life cycle service capability and adaptability to horizontal wells.Second,an integrated platform of zonal oil production and management should be built using a digital artificial lifting system.Third,integration of injection and production should be implemented through large-scale application of zonal oil production and zonal water injection to improve matching and adjustment level between the injection and production parameters,thus making the development adjustment from"lag control"to"real-time optimization"and improving the development effect. 展开更多
关键词 separated zone oil production flowing well zonal oil production mechanical recovery and water plugging hydraulically adjustable zonal oil production intelligent zonal oil production PROSPECT
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Enrichment factors of movable hydrocarbons in lacustrine shale oil and exploration potential of shale oil in Gulong Sag,Songliao Basin,NE China 被引量:5
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作者 ZHAO Wenzhi BIAN Congsheng +9 位作者 LI Yongxin ZHANG Jinyou HE Kun LIU Wei ZHANG Bin LEI Zhengdong LIU Chang ZHANG Jingya GUAN Ming LIU Shijul 《Petroleum Exploration and Development》 SCIE 2023年第3期520-533,共14页
The geological characteristics and production practices of the major middle-and high-maturity shale oil exploration areas in China are analyzed.Combined with laboratory results,it is clear that three essential conditi... The geological characteristics and production practices of the major middle-and high-maturity shale oil exploration areas in China are analyzed.Combined with laboratory results,it is clear that three essential conditions,i.e.economic initial production,commercial cumulative oil production of single well,and large-scale recoverable reserves confirmed by the testing production,determine whether the continental shale oil can be put into large-scale commercial development.The quantity and quality of movable hydrocarbons are confirmed to be crucial to economic development of shale oil,and focuses in evaluation of shale oil enrichment area/interval.The evaluation indexes of movable hydrocarbon enrichment include:(1)the material basis for forming retained hydrocarbon,including TOC>2%(preferentially 3%-4%),and typeⅠ-Ⅱkerogens;(2)the mobility of retained hydrocarbon,which is closely related to the hydrocarbon composition and flow behaviors of light/heavy components,and can be evaluated from the perspectives of thermal maturity(Ro),gas-oil ratio(GOR),crude oil density,quality of hydrocarbon components,preservation conditions;and(3)the reservoir characteristics associated with the engineering reconstruction,including the main pore throat distribution zone,reservoir physical properties(including fractures),lamellation feature and diagenetic stage,etc.Accordingly,13 evaluation indexes in three categories and their reference values are established.The evaluation indicates that the light shale oil zones in the Gulong Sag of Songliao Basin have the most favorable enrichment conditions of movable hydrocarbons,followed by light oil and black oil zones,containing 20.8×10^(8) t light oil resources in reservoirs with R_(0)>1.2%,pressure coefficient greater than 1.4,effective porosity greater than 6%,crude oil density less than 0.82 g/cm^(3),and GOR>100 m/m^(3).The shale oil in the Gulong Sag can be explored and developed separately by the categories(resource sweet spot,engineering sweet spot,and tight oil sweet spot)depending on shale oil flowability.The Gulong Sag is the most promising area to achieve large-scale breakthrough and production of continental shale oil in China. 展开更多
关键词 Gulong Sag continental shale oil movable hydrocarbon enrichment factor enrichment zone/interval evaluation material basis component flow engineering-associated factor
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Legal Issues and Scientific Constraints in the Environmental Assessment of the Deepwater Horizon Oil Spill in Mexico Exclusive Economic Zone (EEZ) in the Gulf of Mexico
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作者 Luis A. Soto Alfonso Vázquez-Botello 《International Journal of Geosciences》 2013年第5期39-45,共7页
The largest accidental marine oil spill (4.9 million barrels) in the Gulf of Mexico (GoM) seabed (1600 m) caused by the sinking of the Deepwater Horizon oil rig in 2010, put to the test once again the resilient capaci... The largest accidental marine oil spill (4.9 million barrels) in the Gulf of Mexico (GoM) seabed (1600 m) caused by the sinking of the Deepwater Horizon oil rig in 2010, put to the test once again the resilient capacity of the pelagic and benthic realms of this Large Marine Ecosystem. Many are the ecological services provided by its waters (fisheries, tourism, aquaculture and fossil fuel reserves) to neighboring countries (US, Mexico and Cuba). However, the unprecedented volumes of hydrocarbons, gas and chemical dispersants (Corexit) introduced in the system, represent ecological stressors whose deleterious effects are still the subject of civil claims and scientific controversy. Presumably, the short scale effects were confined to the Gulf’s northeastern shallow waters, and the combined actions of weathering, biodegradation, and oil recovery left the system almost under pre-spill conditions. Unfortunately, surface and subsurface oil plumes were detected in the spill aftermath, and their dispersion trajectories threatened Mexico EEZ. Surface oil slicks were detected in the pristine waters of northern Yucatán, while subsurface oil plumes from the Macondo’s well blowout were dangerously advancing southwest towards key fishing grounds in the northwestern GoM. This disaster prompted the Mexican government to implement an ambitious ocean monitoring program adopting a bottom-up approach focused on building a base line for more than 42 physicochemical and biological variables for water, sediment and biota from the continental shelf-slope region of the NW GoM. Technological constraints have precluded systematic observations in the vast Mexican EEZ that could discriminate natural variability and oil seep emissions from antropic disturbances. Therefore, preliminary risk analyses relied on seasonal and historical records. Two years of field observations revealed subtle environmental changes in the studied area attributed to antropic disturbances. Waters maintained oligotrophic conditions and zooplankton and benthic infaunal biomass were also poor. Biomarkers in sediments and biota did not exceed EPA’s benchmarks, and sediment’s fingerprinting (δ13C) indicated marine carbon sources. Geomarkers revealed an active transport from the Mississippi towards the NW GoM of phyllosilicates bearing a weathered oil coating. Consequently, shelf and slope sediment toxicity begins to show an increasing trend in the region. The complexity of hydrocarbons bioaccumulation and biodegradation processes in deep waters of the GoM seems to indicate that meso-and large-scale observations may prove to be essential in understanding the capacity of the GoM to recover its ecological stability. 展开更多
关键词 DEEPWATER HORIZON Macondo’s oil SPILL Accident Mexico’s EXCLUSIVE Economic zone GULF of Mexico
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Logging response characteristics and formation process of flushed zone in the Orinoco heavy oil belt, Venezuela
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作者 CHEN Heping CHEN Hao +5 位作者 LI Changwen WANG Yusheng LI Jianping HUANG Rui TIAN Congcong HOU Qiuyuan 《Petroleum Exploration and Development》 2020年第3期585-593,共9页
The origins and logging responses of flushed zones in some blocks of Orinoco heavy oil belt, Venezuela are still unclear. To solve this issue, we examined the conventional logging, nuclear magnetic resonance logging, ... The origins and logging responses of flushed zones in some blocks of Orinoco heavy oil belt, Venezuela are still unclear. To solve this issue, we examined the conventional logging, nuclear magnetic resonance logging, fluid viscosity, core analysis and oil field production data comprehensively to find out the logging responses and origins of the flushed zones. The results show that the main reason for the formation of flushed zone is surface water invasion, which leads to crude oil densification. The crude oil densification produces asphalt membrane(asphalt crust) which wraps up free water, causing special logging responses of the flushed zones. According to the different logging responses, we classified the flushed zones into two types and analyzed the formation processes of the two types of flushed zones. According to the characteristics of logging curves after water flush, we confirmed that the water flush began earlier than the reservoir accumulation. 展开更多
关键词 flushed zone asphalt crust crude oil thickening freshwater leaching foam oil flow Orinoco heavy oil belt
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Enrichment conditions and distribution characteristics of lacustrine medium-to-high maturity shale oil in China
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作者 ZHAO Wenzhi ZHU Rukai +2 位作者 LIU Wei BIAN Congsheng WANG Kun 《地学前缘》 EI CAS CSCD 北大核心 2023年第1期242-259,共18页
Successful breakthroughs have been made in shale oil exploration in several lacustrine basins in China,indicating a promising future for shale oil exploration and production.Current exploration results have revealed t... Successful breakthroughs have been made in shale oil exploration in several lacustrine basins in China,indicating a promising future for shale oil exploration and production.Current exploration results have revealed the following major conditions of lacustrine shale oil accumulation:(1)stable and widely distributed shale with a high organic abundance and appropriate thermal maturity acts as a fundamental basis for shale oil retention.This shale exhibits several critical parameters,such as total organic carbon content greater than 2%,with optimal values ranging from 3% to 4%,kerogen Ⅰ and Ⅱ_(1) as the dominant organic matter types,and vitrinite reflectance(R_(o))values greater than 0.9%(0.8% for brackish water environments).(2)Various types of reservoirs exhibiting brittleness and a certain volume of micro-nanoscale pores are critical conditions for shale oil accumulation,and these reservoirs have porosities greater than 3% to 6%.Moreover,when diagenesis is incipient,pure shales are not favorable for medium-to-high maturity shale oil enrichment,whereas tight sandstone and hybrid rocks with clay content less than 20% are favorable;however,for medium-to-late-stage diagenesis,pure shales with a clay content of 40% are favorable.(3)The retention of a large amount of high-quality hydrocarbons is the factor that best guarantees shale oil accumulation with good mobility.Free hydrocarbon content exceeding a threshold value of 2 mg/g is generally required,and the optimum value is 4 mg/g to 6 mg/g.Moreover,a gas-oil ratio exceeding a threshold value of 80 m^(3)/m^(3) is required,with the optimal value ranging from 150 m^(3)/m^(3) to 300 m^(3)/m^(3).(4)High-quality roof and floor sealing conditions are essential for the shale oil enrichment interval to maintain the overpressure and retain a sufficient amount of hydrocarbons with good quality.Lacustrine shale oil distributions exhibit the following characteristics:(1)major enrichment areas of shale oil are located in semi-deep to deep lacustrine depositional areas with external materials,such as volcanic ash fallout,hydrothermal solutions,and radioactive substances with catalytic action,as inputs;(2)intervals with“four high values and one preservation condition”govern the distribution of shale oil enrichment intervals;and(3)favorable assemblages of lithofacies/lithologies determine the distribution of enrichment area.According to preliminary estimates,China has 131×10^(8) to 163×10^(8) t of total shale oil resources with medium-to-high thermal maturity,among which 67×10^(8) to 84×10^(8) t is commercial.These resources are primarily located in the Chang 7^(1+2) interval in the Ordos Basin,Qing 1+2 members in Gulong sag in the Songliao Basin,Kongdian and Shahejie formations of Cangdong sag,Qikou sag and the Jiyang depression in the Bohai Bay Basin,and Lucaogou Formation in the Junggar Basin. 展开更多
关键词 medium-to-high maturity shale oil sweet-spot zone enrichment conditions distributional characteristics assessment standard onshore China
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THE EVOLUTION OF THE LANKAO-LIAOCHENG FRACTURAL ZONE AND ITS OIL-GAS ACCUMULATION
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作者 WEI Zhouling LIN Ge and QIN Qingxiang (Chang sha Institute of Geotectonies, A cad emia Siniea, Chang Sha, 410013) 《Geotectonica et Metallogenia》 1994年第Z1期33-37,共5页
The Lankao-Liaocheng Fractural Zone is a large-seade NNE-trending struetural zone in the North China Crustoblock. Dated from the Late Arehean-Early Proterozoie, it is stil1 active now. Its nature varied with time in i... The Lankao-Liaocheng Fractural Zone is a large-seade NNE-trending struetural zone in the North China Crustoblock. Dated from the Late Arehean-Early Proterozoie, it is stil1 active now. Its nature varied with time in its developing process. It has became a tensile ultralithospherie fraetural zone at present or in diwa residual-mobility period. Some cenozoic oil-gas-bearing basins are distributed along the fraetural zone which fomed an important oil-gas accumulating belt in the North China Ctustoblock. 展开更多
关键词 Lankao-Liaocheng Fractural zone EVOLUTION oil-gas ACCUMULATION
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塔里木盆地西北缘沙井子断裂带的构造特征与形成演化 被引量:3
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作者 孙崇浩 周慧 +4 位作者 罗新生 杨鹏飞 缪卫东 石磊 黄智斌 《地质科学》 CAS CSCD 北大核心 2024年第1期199-209,共11页
塔里木盆地西北缘的沙井子断裂带,位于塔北隆起的温宿凸起和北部坳陷的阿瓦提凹陷之间。它是塔里木盆地的一条一级断裂带,由沙井子断裂、英雄断裂、温宿断裂和沙南断裂组成。其中沙井子断裂是主干断裂,其它3条是其分支断裂。本轮研究新... 塔里木盆地西北缘的沙井子断裂带,位于塔北隆起的温宿凸起和北部坳陷的阿瓦提凹陷之间。它是塔里木盆地的一条一级断裂带,由沙井子断裂、英雄断裂、温宿断裂和沙南断裂组成。其中沙井子断裂是主干断裂,其它3条是其分支断裂。本轮研究新发现温宿分支断裂,并将沙南断裂解释为英雄断裂前缘的反冲断层,归属沙井子断裂带。沙井子断裂带的雏形形成于奥陶纪末—志留纪初,在泥盆纪末—石炭纪、二叠纪末—三叠纪初、侏罗纪末—白垩纪初、白垩纪末—古近纪初和新近纪—第四纪发生过多期冲断作用和新近纪末—第四纪初的张扭性构造变形后,才最终定型。沙井子断裂带是一条断控油气富集区带,温宿油田、托探1油藏、沙南1油藏、新苏地1油气藏等都受其控制。 展开更多
关键词 沙井子断裂带 温宿断裂 沙南断裂 多旋回冲断构造 断控油气富集带 塔里木盆地西北缘
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中西非裂谷系富油凹陷石油地质特征与勘探方向 被引量:1
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作者 窦立荣 史忠生 +1 位作者 庞文珠 马峰 《石油勘探与开发》 EI CSCD 北大核心 2024年第1期1-13,共13页
基于地震、钻井、烃源岩测试分析等资料,对中西非裂谷系主要盆地富油凹陷石油地质特征进行研究,并探讨未来油气勘探方向。研究表明:中非裂谷系发育下白垩统湖相优质烃源岩,西非裂谷系发育上白垩统陆源海相优质烃源岩,两类烃源岩为中西... 基于地震、钻井、烃源岩测试分析等资料,对中西非裂谷系主要盆地富油凹陷石油地质特征进行研究,并探讨未来油气勘探方向。研究表明:中非裂谷系发育下白垩统湖相优质烃源岩,西非裂谷系发育上白垩统陆源海相优质烃源岩,两类烃源岩为中西非裂谷系油气富集提供了物质基础。中西非裂谷系发育包括基岩在内的多套储集层,并存在下白垩统、上白垩统和古近系3套区域盖层。晚中生代以来,受中非剪切带右旋走滑作用等地球动力学因素的影响,中西非裂谷系不同方向的盆地在裂谷作用期次、区域盖层发育层段、圈闭类型及成藏模式等方面存在差异。其中,北东—南西向盆地主要保存了早白垩世一期裂谷层序,区域盖层位于下白垩统裂陷期地层内,形成反转背斜、花状构造及基岩潜山等圈闭类型,发育“源储一体、源内成藏”及“源上储下、源下成藏”两种成藏模式;北西—南东向盆地具有多期裂谷叠置特征,发育上白垩统和古近系区域盖层,形成披覆背斜、断背斜、反向断块等圈闭类型,以“源下储上、源上成藏”为主要成藏模式。多期叠置裂谷盆地的源内成藏组合、强反转盆地的源内岩性油藏及页岩油是中西非裂谷系盆地未来勘探的重要领域。 展开更多
关键词 烃源岩 区域盖层 圈闭类型 成藏模式 富油凹陷 中非剪切带 中西非裂谷系
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热羽流与置换通风作用下油雾颗粒预测模型
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作者 王非 孟钦鹏 +2 位作者 翁文兵 耿宇 王昕 《空气动力学学报》 CSCD 北大核心 2024年第3期119-128,共10页
高大空间机械厂房采用置换通风系统时,存在竖直方向油雾颗粒浓度分布不均匀的现象。这种现象会影响以降低室内颗粒浓度为目的的需求通风量。为了快速预测竖向油雾颗粒浓度分布,采用区域模型建模方法,考虑壁面流区、热羽流区和主流区等... 高大空间机械厂房采用置换通风系统时,存在竖直方向油雾颗粒浓度分布不均匀的现象。这种现象会影响以降低室内颗粒浓度为目的的需求通风量。为了快速预测竖向油雾颗粒浓度分布,采用区域模型建模方法,考虑壁面流区、热羽流区和主流区等主要区域,基于质量平衡与能量平衡方程,建立了竖向油雾颗粒浓度分布预测模型;同时在实验舱内进行了实验验证,模型计算结果与实验结果趋势相符,最大相对误差不大于20%,表明该模型能够基本满足工程要求;以5种颗粒散发率工况为例进行节能分析,发现引入预测模型后计算得到的置换通风系统需求通风量可比传统变风量系统通风设计方法计算的减少18.83%~44.41%。该预测模型能较为准确地预测高大厂房中置换通风时竖向不同高度的油雾颗粒浓度,可应用于需要快速预测竖向颗粒平均浓度的场景。 展开更多
关键词 机械加工 油雾颗粒 垂直分布 区域模型 热羽流
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深层超深层油气藏高应力下数字岩心构建方法
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作者 姚军 王春起 +3 位作者 黄朝琴 杨永飞 孙海 张磊 《石油钻探技术》 CAS CSCD 北大核心 2024年第2期38-47,共10页
深层超深层油气藏由于埋藏深,其地应力达200 MPa,会显著改变储层岩石孔隙的微观结构。数字岩心是孔隙尺度数值模拟的重要载体,但是现有数字岩心重构方法是基于常温常压下岩心的扫描图像重构,不能反映高应力下的孔隙结构。为此,提出了一... 深层超深层油气藏由于埋藏深,其地应力达200 MPa,会显著改变储层岩石孔隙的微观结构。数字岩心是孔隙尺度数值模拟的重要载体,但是现有数字岩心重构方法是基于常温常压下岩心的扫描图像重构,不能反映高应力下的孔隙结构。为此,提出了一种基于离散元法考虑高应力影响的数字岩心重构方法。首先,采用分水岭算法分割CT图像,利用球面谐波分析方法建立轮廓数据库,并在PFC^(3D)中建立Clump(团簇)模板库;然后,根据孔隙度和粒径分布使用模板库中的Clump建立离散元模型,并用两点相关和线性路径相关函数曲线评价模型的准确性;随后,标定颗粒间微观力学参数,并加载应力模拟得到不同应力下的数字岩心;最后,分析了不同应力下数字岩心的孔隙几何拓扑结构,计算孔隙度和渗透率。以Bentheim砂岩为例,构建了其不同应力下的数字岩心,研究结果表明,应力增大,导致孔隙和喉道半径缩小、喉道伸长、连通性变差、孔隙度和渗透率减小。研究结果为深层超深层油气藏孔隙尺度模拟提供了技术途径。 展开更多
关键词 油气藏 深层超深层 数字岩心重构 离散元法 孔隙几何拓扑结构 渗透率
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二氧化碳地质封存与利用新进展
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作者 王光付 李阳 +2 位作者 王锐 周银邦 贾英 《石油与天然气地质》 EI CAS CSCD 北大核心 2024年第4期1168-1179,共12页
为了推动碳减排,实现碳中和目标,分析研究了CO_(2)捕集、利用与封存(CCUS)技术进展,提出了存在问题和发展方向。研究表明:全球CCUS产业发展迅速,截至2023年底,全球大型CCUS项目数量达到392个,比2022年增加了一倍,已初步具备商业化运营... 为了推动碳减排,实现碳中和目标,分析研究了CO_(2)捕集、利用与封存(CCUS)技术进展,提出了存在问题和发展方向。研究表明:全球CCUS产业发展迅速,截至2023年底,全球大型CCUS项目数量达到392个,比2022年增加了一倍,已初步具备商业化运营的技术条件。CO_(2)封存与利用研究应用不断取得新进展:①CO_(2)地质封存体表征和建模采用表征体元(REV)技术,将微观尺度的属性应用于宏观尺度的地质模型,用应变张量数据进行封存体动态表征和监测。综合应用地球化学成像、微地震、地温以及大气监测技术方法进行封存体泄漏监测。建立不同沉积类型储层模拟技术,模拟封存体内不同CO_(2)羽流迁移情景和封存潜力。②大数据和人工智能广泛应用于CCUS。建立了基于深度学习和耦合地质力学的CO_(2)封存风险快速评估代理模型。用机器学习预测或评估剩余油区CO_(2)提高采收率和封存效率。③CO_(2)驱油新技术及应用新领域取得新进展。发展了CO_(2)驱与低矿化度水驱交替注入、CO_(2)微纳米气泡驱油、CO_(2)加增黏剂驱油和CO_(2)泡沫驱油等技术,应用于矿场试验取得良好效果。CO_(2)驱油领域从中-低渗透砂岩油藏、致密砂岩油藏拓展到残余油带、页岩油藏及天然气藏。CCUS也面临长期封存安全性、经济性、技术不确定性等问题和挑战,需要进一步完善法律、法规,开展多学科研究与技术创新,加强国际合作,大力发展CO_(2)地质封存与利用新技术,保障CO_(2)长期封存安全性,提高商业运营经济性。 展开更多
关键词 安全性评价 表征体元(REV) 微纳米气泡 残余油带(ROZ) 地质封存体 CO_(2)驱油 CO_(2)捕集与封存(CCS) CO_(2)捕集、利用与 封存(CCUS)
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海外大型油田油气过渡带数值模拟研究及开发实践——以哈萨克斯坦K油田为例
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作者 杨永亮 曹光胜 +2 位作者 张远健 庚琪 冉雪玲 《复杂油气藏》 2024年第3期323-328,共6页
通过探讨气顶油藏屏障注水提高开发效果的机理,对气顶油藏屏障注水运移规律、实现油气分隔及压力拟合因素进行分析,利用数值模拟技术证明了气顶油藏在油气界面处建立注水屏障,可以防止油气互窜。模拟结果表明,当注水屏障形成初期,注入... 通过探讨气顶油藏屏障注水提高开发效果的机理,对气顶油藏屏障注水运移规律、实现油气分隔及压力拟合因素进行分析,利用数值模拟技术证明了气顶油藏在油气界面处建立注水屏障,可以防止油气互窜。模拟结果表明,当注水屏障形成初期,注入水分别向气顶和油环流动,补充了油区和气区的地层能量,既有效抑制了气顶膨胀,又减缓了油气界面运移速度,降低了油井生产气油比。当注水屏障形成后,注入水切断油区与气区的通道,保持了油气区之间的压力平衡和产量稳定,提高了油气过渡带的稳定性和整个油田的采出程度。通过优化气顶油环屏障注水参数,结合哈萨克斯坦K油田气顶油藏的开发实践,优选出注水井距离油气边界150 m,注水井井距400 m,采油井井距200 m的注水屏障方案,既保证了油气缓冲区合理开采,还能充分利用气顶能量,该方案在矿场实践中取得较好应用效果。 展开更多
关键词 气顶油藏 水动力屏障 数值模拟 油气过渡带
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松辽盆地敖古拉断裂带构造演化及断控油气聚集机制 被引量:1
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作者 孙国庆 《特种油气藏》 CAS CSCD 北大核心 2024年第3期45-51,共7页
松辽盆地敖古拉断裂带呈现出复杂的运动学特征,各成藏主控要素时空匹配关系研究难度大,为油藏形态精准刻画带来了挑战。针对该问题,综合地质、地震解剖和钻井资料分析,梳理构造发育史及断裂成因,并在成藏认识的基础上,明确断裂控制油气... 松辽盆地敖古拉断裂带呈现出复杂的运动学特征,各成藏主控要素时空匹配关系研究难度大,为油藏形态精准刻画带来了挑战。针对该问题,综合地质、地震解剖和钻井资料分析,梳理构造发育史及断裂成因,并在成藏认识的基础上,明确断裂控制油气富集的机制。研究区断裂密集带可划分为2个级别,并根据断层与层位切割关系将断层分为3类。研究表明:敖古拉断裂带由2条反“S”形主干断裂组成,历经断陷期、坳陷期以及反转期3个阶段;断陷期断裂带活动强度与伸展率最大,坳陷期逐渐减弱,伴生多条反向调节断层,反转期断层活动强度与伸展率再次增强;油源断层是沟通烃源岩和圈闭的垂向运移通道,控制了与断层相关圈闭的形成,为油气运移、聚集提供了有利条件。研究结果能够为进一步寻找有利勘探目标及增储上产提供理论依据。 展开更多
关键词 松辽盆地 敖古拉断裂带 构造演化 断控油气
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LP油田沉降罐过渡带原油破乳脱水实验研究
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作者 张政 童志明 +2 位作者 杨超 王占生 陈武 《日用化学工业(中英文)》 CAS 北大核心 2024年第7期784-794,共11页
LP油田沉降罐过渡带原油中含有起乳化作用的胶态FeS等成分,导致原油脱水困难,不能满足原油进后续电脱水器的要求;分析了过渡带原油物性、原油组分及采出水组成,对FeS脱除剂及破乳剂的筛选进行优化实验,重点研究了FeS脱除剂与破乳剂联合... LP油田沉降罐过渡带原油中含有起乳化作用的胶态FeS等成分,导致原油脱水困难,不能满足原油进后续电脱水器的要求;分析了过渡带原油物性、原油组分及采出水组成,对FeS脱除剂及破乳剂的筛选进行优化实验,重点研究了FeS脱除剂与破乳剂联合破乳效果及适应性。结果表明,筛选出的FeS脱除剂BLJ-01对FeS有很好的溶解效果,体积分数3%的FeS脱除剂BLJ-01和质量浓度800 mg/L的破乳剂X-75联合使用,55℃下可有效去除沉降罐过渡带原油中FeS,沉降罐过渡带原油脱水率达85.78%;BLJ-01与X-75配合使用适应性较强,对含水率超过40%的P2联合站沉降罐过渡带原油脱水率均可达80%以上,且在弱酸或弱碱性条件下都可以表现出优良的破乳效果,也适用于SJ站沉降罐过渡带原油的破乳脱水,并能显著降低破乳剂使用量。 展开更多
关键词 沉降罐过渡带原油 破乳 硫化亚铁 处理剂
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