摘要
基于高温高压条件下页岩物性、三轴应力和甲烷等温吸附等针对性实验,对四川盆地及其周缘奥陶系五峰组—志留系龙马溪组深层页岩气富集特征进行研究。结果表明:①深层页岩孔隙度和水平渗透率比中浅层页岩出现较大程度的降低,含气结构以游离气为主。②深层页岩偏应力和轴向应变等参数增大,导致破裂难度增加。③受构造位置和形态、裂缝特征和流体活动期次等控制,深层页岩气保存条件更复杂。④为实现深层页岩气经济开发,深化地质认识是基础,探索针对性压裂改造工程工艺是关键。⑤Metabolograptus persculptus带—Parakidograptus acuminatus带(LM1—LM3笔石带)硅质页岩、含灰硅质页岩是深层页岩气富集高产层段和水平井穿行的有利靶窗,厚度超过10 m的焦石坝、武隆、长宁和泸州等地区是深层页岩气最有利富集区。研究指出深层页岩气勘探应优先在宽缓构造且埋深小于5000 m、LM1—LM3笔石带页岩厚度大于10 m的“深水深层型”页岩气区进行勘探开发部署,开发工程应增加开发井水平段长度,并采用密切割、强加砂、双暂堵等工艺,以最大程度地改造深部页岩储集层。
The enrichment characteristics of deep shale gas in the Ordovician Wufeng-Silurian Longmaxi formations in the Sichuan Basin and its surrounding areas are investigated through experiments under high temperature and high pressure,including petrophysical properties analyses,triaxial stress test and isothermal adsorption of methane experiment.(1)The deep shale layers drop significantly in porosity and permeability compared with middle-shallow shale layers,and contain mainly free gas.(2)With higher deviatoric stress and axial strain,the deep shale layers have higher difficulty to fracture.(3)Affected by structural location and morphology,fracture characteristics,geofluid activity stages and intensity,deep shale gas reservoirs have more complicated preservation conditions.(4)To achieve the commercial development of deep shale gas reservoirs,deepening geological understanding is the basis,and exploring reservoir simulation technology befitting the geological features is the key.(5)The siliceous shale and limestone-bearing siliceous shale in the Metabolograptus persculptus-Parakidograptus acuminatus zones(LM1-LM3 graptolite zones)are the high-production intervals for deep shale gas and the most favorable landing targets for horizontal drilling.Deeps water areas such as Jiaoshiba,Wulong,Luzhou and Changning with deep shale reservoirs over 10 m thickness are the most favorable areas for deep shale gas enrichment.It is recommended to carry out exploration and development practice in deep-water shale gas areas deposited deep with burial depth no more than 5000 m where the geological structure is simple and the shale thickness in the LM1-LM3 graptolite zone is greater than 10 m.It is better to increase the lateral length of horizontal wells,apply techniques including high intensity of perforations,large volume of proppant,far-field and near-wellbore diversions to maximize the stimulated deep reservoir volume.
作者
聂海宽
李沛
党伟
丁江辉
孙川翔
刘秘
王进
杜伟
张培先
李东晖
苏海琨
NIE Haikuan;LI Pei;DANG Wei;DING Jianghui;SUN Chuanxiang;LIU Mi;WANG Jin;DU Wei;ZHANG Peixian;LI Donghui;SU Haikun(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China;Sinopec Petroleum Exploration and Production Research Institute,Beijing 102206,China;School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710300;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;Research Institute of Petroleum Exploration and Development,Sinopec Jianghan Oilfield Company,Wuhan 430223,China;Sinopec East China Company,Nanjing 210019,China;School of Energy Resources,China University of Geosciences,Beijing 100083,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2022年第4期648-659,共12页
Petroleum Exploration and Development
基金
国家自然科学基金“四川盆地五峰组—龙马溪组页岩气储层演化机理及评价方法”(41872124)
国家自然科学重点基金“复杂构造带常压页岩气动态赋存机理与可动性研究”(42130803)
中国石化重点科技项目“深层页岩气勘探/开发/工程一体化设计技术”(P20046)。
关键词
深层页岩气
富集条件
储集层特征
勘探方向
奥陶系五峰组
志留系龙马溪组
四川盆地
deep shale gas
enrichment conditions
reservoir characteristics
exploration direction
Ordovician Wufeng Formation
Silurian Longmaxi Formation
Sichuan Basin
