Based on rock mineral and geochemical analysis, microscopic observation, physical property measurement, and thin laminae separation test, etc., the characteristics of typical laminae of the Paleogene Shahejie Formatio...Based on rock mineral and geochemical analysis, microscopic observation, physical property measurement, and thin laminae separation test, etc., the characteristics of typical laminae of the Paleogene Shahejie Formation carbonate-rich shale in the Jiyang Depression were analyzed, and the organic matter abundance, reservoir properties, and oil-bearing properties of different laminae were compared. Typical shale storage-seepage structures were classified, and the mobility of oil in different types of shale storage-seepage structure was compared. The results show that the repeated superposition of mud laminae and calcite laminae are the main layer structure of carbonate-rich shales. The calcite laminae are divided into micritic calcite laminae, sparry calcite laminae and fibrous calcite vein. The mud-rich laminae are the main contributor to the organic matter abundance and porosity of shale, with the best hydrocarbon generation potential, reservoir capacity, and oil-bearing property. The micritic calcite laminae also have relatively good hydrocarbon generation potential, reservoir capacity and oil-bearing property. The sparry calcite laminae and fibrous calcite vein have good permeability and conductivity. Four types of shale storage-seepage structure are developed in the carbonate-rich shale, and the mobility of oil in each type of storage-seepage structure is in descending order: sparry calcite laminae enriched shale storage-seepage structure, mixed calcite laminae enriched shale storage-seepage structure, fibrous calcite vein enriched shale storage-seepage structure, and micritic calcite laminae enriched shale storage-seepage structure. The exploration targets of carbonate-rich shale in the Jiyang Depression Shahejie Formation are different in terms of storage-seepage structure at different thermal evolution stages.展开更多
Shale oil, an important unconventional resource （Hill R J, et al, 2007, Lucas W B, 2010）, is widely developed in lacstrine basins of East-China （Li Juyuan, et al, 2014）. Having representative geology characters of...Shale oil, an important unconventional resource （Hill R J, et al, 2007, Lucas W B, 2010）, is widely developed in lacstrine basins of East-China （Li Juyuan, et al, 2014）. Having representative geology characters of laetrine basins, the Dongying Depression＇s formation and evolution history provides favorable organic material and geological conditions for shale oil generation and preservation.展开更多
Oil and gas content in shale and mudstone is one of the key factors that influence exploration of shale oil, and how to carry out quantitative study is one of the puzzles to be solved all along. In the last decade, wi...Oil and gas content in shale and mudstone is one of the key factors that influence exploration of shale oil, and how to carry out quantitative study is one of the puzzles to be solved all along. In the last decade, with the progress of exploration practice and improvement of testing method in shale oil, it is possible for researchers to carry out quantitative study on gas content in shale[1-2], and their achievements have widely been applied in shale gas exploration.展开更多
Although a large amount of hydrocarbon exists in shale,only a part of hydrocarbon is movable because of the shale oil＇s flow ability character and the adsorption between hydrocarbon and minerals,kerogen,etc.Nuclear m...Although a large amount of hydrocarbon exists in shale,only a part of hydrocarbon is movable because of the shale oil＇s flow ability character and the adsorption between hydrocarbon and minerals,kerogen,etc.Nuclear magnetic resonance（NMR）cores analysis was commonly used to measure movable oil in conventional cores（Li Tai-wei,et al,2012;Li Zhentao,2011;Xiao Qiusheng,et al,2009）.展开更多
The mechanisms of abnormal high pressures are studied in this paper, and it is concluded that the undercompaction, hydrocarbon generation and stratum denudation are obviously effective to fluid pressure buildup. Becau...The mechanisms of abnormal high pressures are studied in this paper, and it is concluded that the undercompaction, hydrocarbon generation and stratum denudation are obviously effective to fluid pressure buildup. Because of the episodic difference, the hydrocarbon generation and stratum denudation are the main factors influencing oil-gas migration. On the basis of basin evolutionary analysis in the Dongying Sag, it is considered that the undercompaction mainly caused the abnormal pressure before the first denudation by the uplift in Late Paleogene, while hydrocarbon generation was the main factor of abnormal pressure after the denudation. The second denudation occurred in Late Neogene, which changed the pressure field and induced the fluid migration. The development of overpressures is the necessary condition to the formation of lithologic hydrocarbon reservoirs, which have positive correlations to overpressures. According to the fullness of the present reservoirs, the quantitative relations between oil-bearing property and driving forces of reservoir formation were determined, the latter were decided by dynamic source, reservoir capillary pressure, fluid pressure of surrounding rocks and the dynamic attenuation in different conducting systems.展开更多
基金Supported by the China National Science and Technology Major Project(2017ZX05049-004)Sinopec Project(P22083,P23084).
文摘Based on rock mineral and geochemical analysis, microscopic observation, physical property measurement, and thin laminae separation test, etc., the characteristics of typical laminae of the Paleogene Shahejie Formation carbonate-rich shale in the Jiyang Depression were analyzed, and the organic matter abundance, reservoir properties, and oil-bearing properties of different laminae were compared. Typical shale storage-seepage structures were classified, and the mobility of oil in different types of shale storage-seepage structure was compared. The results show that the repeated superposition of mud laminae and calcite laminae are the main layer structure of carbonate-rich shales. The calcite laminae are divided into micritic calcite laminae, sparry calcite laminae and fibrous calcite vein. The mud-rich laminae are the main contributor to the organic matter abundance and porosity of shale, with the best hydrocarbon generation potential, reservoir capacity, and oil-bearing property. The micritic calcite laminae also have relatively good hydrocarbon generation potential, reservoir capacity and oil-bearing property. The sparry calcite laminae and fibrous calcite vein have good permeability and conductivity. Four types of shale storage-seepage structure are developed in the carbonate-rich shale, and the mobility of oil in each type of storage-seepage structure is in descending order: sparry calcite laminae enriched shale storage-seepage structure, mixed calcite laminae enriched shale storage-seepage structure, fibrous calcite vein enriched shale storage-seepage structure, and micritic calcite laminae enriched shale storage-seepage structure. The exploration targets of carbonate-rich shale in the Jiyang Depression Shahejie Formation are different in terms of storage-seepage structure at different thermal evolution stages.
文摘Shale oil, an important unconventional resource （Hill R J, et al, 2007, Lucas W B, 2010）, is widely developed in lacstrine basins of East-China （Li Juyuan, et al, 2014）. Having representative geology characters of laetrine basins, the Dongying Depression＇s formation and evolution history provides favorable organic material and geological conditions for shale oil generation and preservation.
文摘Oil and gas content in shale and mudstone is one of the key factors that influence exploration of shale oil, and how to carry out quantitative study is one of the puzzles to be solved all along. In the last decade, with the progress of exploration practice and improvement of testing method in shale oil, it is possible for researchers to carry out quantitative study on gas content in shale[1-2], and their achievements have widely been applied in shale gas exploration.
文摘Although a large amount of hydrocarbon exists in shale,only a part of hydrocarbon is movable because of the shale oil＇s flow ability character and the adsorption between hydrocarbon and minerals,kerogen,etc.Nuclear magnetic resonance（NMR）cores analysis was commonly used to measure movable oil in conventional cores（Li Tai-wei,et al,2012;Li Zhentao,2011;Xiao Qiusheng,et al,2009）.
文摘The mechanisms of abnormal high pressures are studied in this paper, and it is concluded that the undercompaction, hydrocarbon generation and stratum denudation are obviously effective to fluid pressure buildup. Because of the episodic difference, the hydrocarbon generation and stratum denudation are the main factors influencing oil-gas migration. On the basis of basin evolutionary analysis in the Dongying Sag, it is considered that the undercompaction mainly caused the abnormal pressure before the first denudation by the uplift in Late Paleogene, while hydrocarbon generation was the main factor of abnormal pressure after the denudation. The second denudation occurred in Late Neogene, which changed the pressure field and induced the fluid migration. The development of overpressures is the necessary condition to the formation of lithologic hydrocarbon reservoirs, which have positive correlations to overpressures. According to the fullness of the present reservoirs, the quantitative relations between oil-bearing property and driving forces of reservoir formation were determined, the latter were decided by dynamic source, reservoir capillary pressure, fluid pressure of surrounding rocks and the dynamic attenuation in different conducting systems.
