四川盆地下侏罗统自流井组陆相页岩油气地质特征  

Geological characteristics of continental shale oil and gas in Lower Jurassic Ziliujing Formation of Sichuan Basin

作　　者：胡宗全 冯动军[1,2,3] 李鹏 王倩茹[1,2,3] 刘忠宝 王濡岳[1,2,3] 赵国伟 HU Zongquan;FENG Dongjun;LI Peng;WANG Qianru;LIU Zhongbao;WANG Ruyue;ZHAO Guowei(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,Beijing102206;Key Laboratory of Shale Oil/Gas Exploration and Production Technology,SINOPEC,Beijing102206;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing102206;Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi,Jiangsu214126)

机构地区：[1]页岩油气富集机理与高效开发全国重点实验室,北京102206 [2]中国石化页岩油气勘探开发重点实验室,北京102206 [3]中国石油化工股份有限公司石油勘探开发研究院,北京102206 [4]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126

出　　处：《地质论评》2024年第2期591-608,共18页Geological Review

基　　金：国家重大专项课题(编号:2017ZX05036-004);中国石油化工股份有限公司科技攻关项目(编号:P19017-2,P21078-9)的成果。

摘　　要：四川盆地下侏罗统自流井组发育东岳庙段和大安寨段两套富有机质页岩层系,主要为湖相沉积的页岩夹粉砂岩、介壳灰岩。基于页岩、介壳灰岩和粉砂岩之间的组合特征,自流井组共识别出3类7种岩相组合类型。页岩有机质丰度中等,有机质类型以Ⅱ1、Ⅱ2型为主,热演化程度中等,油气共存。页岩储集空间既有无机孔,也有有机质孔,局部发育微裂缝。自流井组页岩中无机矿物与有机质、有机质与有机质孔的配置关系控制着页岩源—储配置的有效性,在较高的演化程度下,随着TOC的增大有机质孔隙度增大,页岩的源—储配置关系变好。刚性矿物稳定支撑格架下保存的固体沥青个体大,内部有机质孔数量多、孔径大;黏土矿物不稳定支撑格架下保存的沥青呈长条形,内部的有机质孔孔径较小。基于页岩层系不同岩性源—储耦合条件评价结果,页岩的源—储耦合条件明显优于夹层,源—储耦合条件好的优质页岩层段是页岩油气的甜点层段,其中黏土质页岩最好,(含)介壳灰质页岩、(含)粉砂质页岩为次;介壳灰岩和粉(细)砂岩夹层不具备烃源条件且储集条件差,只能与相邻的富有机质页岩形成近源聚集体系。The Jurassic Ziliujing Formation in the Sichuan Basin has two organic-rich shale series,the Dongyuemiao Member and Da’anzhai Member,which are mainly lacustrine shale interbedded with siltstone and shell limestone.Methods:Analyzing core samples from the Lower Jurassic Ziliujing Formation in the Sichuan Basin serves multiple research objectives.It involves investigating sedimentation patterns,hydrocarbon resources,and reservoir characteristics,assessing the inorganic pore features across various lithofacies and minerals,studying organic pore development within distinct organic matter types,examining the spatial correlation between different pore types and hydrocarbon sources,evaluating shale gas occurrence capacity,and understanding diagenesis and hydrocarbon generation processes at different stages of evolution.These analyses offer valuable insights for sedimentation studies,understanding hydrocarbon resources and reservoir in lacustrine shale oil and gas.They hold significant value for exploring the enrichment mechanisms of lacustrine shale oil and gas,thus guiding strategic deployment for the exploration of Jurassic shale oil and gas reserves in the Sichuan Basin.Results:Based on the assemblage characteristics of shale,shell limestone and siltstone,3 types and 7 types of lithofacies assemblage are identified in the Lower Jurassic Ziliujing Formation.The organic matter abundance of the shale is medium,the organic matter types are mainly type II1 and type II2,the thermal evolution degree is medium,and oil and gas coexist.There are both inorganic pores and organic pores in shale reservoir space,and micro-fractures are developed locally.The relationship between the allocation of inorganic minerals and organic matter,and between organic matter and organic pores in the Ziliujing Formation shale controls the effectiveness of the source-reservoir allocation of the shale.At a higher evolution degree,the organic matter porosity increases with the increase of TOC,and the source-reservoir allocation relationship becomes b

关 键 词：陆相 页岩油气 源—储耦合 下侏罗统自流井组 四川盆地 

分 类 号：P618.13[天文地球—矿床学]