川东北地区陆相页岩油气储层特征及控制因素  

Characteristics and control factors of continental shale oil&gas reservoirs in northeastern Sichuan Basin

作　　者：车正强 崔永旭 王泽宇 何硕 杨琳 唐谢 CHE Zhengqiang;CUI Yongxu;WANG Zeyu;HE Shuo;YANG Lin;TANG Xie(Geological Exploration&Development Research Institute,CNPC Chuanqing Drilling Engineering Company,Chengdu,Sichuan 610056,China;Northwest Sichuan Gas Mine,PetroChina Southwest Oil&Gas Field Company,Jiangyou,Sichuan 621700,China)

机构地区：[1]中国石油川庆钻探地质勘探开发研究院 [2]中国石油西南油气田分公司川西北气矿

出　　处：《录井工程》2025年第1期130-136,共7页Mud Logging Engineering

基　　金：中国石油集团川庆钻探工程有限公司重大项目“超深层地质录井技术研究”(编号:CQ2023B⁃57⁃1⁃1)。

摘　　要：四川盆地川东北地区凉高山组优质烃源岩是陆相页岩油气勘探开发的重要层位。为了指导该区域陆相页岩油气的下步勘探开发,通过岩石热解、扫描电镜和X射线衍射等录井技术进行储层的宏观、微观特征分析,深入探讨了凉高山组页岩油气主控因素。结果表明:凉高山组主要发育3类典型岩性组合序列,纵向上表现为一次较完整的湖侵-湖退旋回;不同烃源岩生烃潜力差异较大,其中黑色页岩的生烃能力最强,具有高总有机碳(TOC)、高游离烃(S1)、高热解烃(S2)的特征,而泥质粉砂岩的生烃能力最弱;优质页岩储集空间以无机孔、有机质孔和微裂缝为主,其主要矿物类型为石英和黏土矿物,储集性和可压裂性好。进一步分析认为,凉高山组大套优质湖相页岩主要受沉积环境控制,形成于水体较深的还原环境,有利于有机质的埋藏保存,较大的地层厚度使页岩油气难以克服运移阻力而多滞留于烃源岩的中部,且上部和下部页岩中少量油气可能在压力作用下部分发生了排运。综合分析认为,川东北地区凉高山组湖相页岩有机质热演化程度适中,微裂缝发育,可压裂性好,具有良好的页岩油气富集与开发潜力。The highquality source rock of Lianggaoshan Formation in northeastern Sichuan Basin is an important horizon for continental shale oil&gas exploration and development.To guide the future exploration and development of continental shale oil&gas in this area,the macro and micro characteristics of the reservoirs were analyzed by mud logging techniques such as rock pyrolysis,scanning electron microscope and Xray diffraction,and the main control factors of shale oil&gas in Lianggaoshan Formation were deeply discussed.The following findings are obtained:There are three types of typical lithological combination sequences in Lianggaoshan Formation,which reflect a relatively complete lacustrine transgressionlacustrine regression cycle vertically;The hydrocarbon generation potential of different source rocks varies greatly,among which black shale has the strongest hydrocarbon generation potential with high total organic carbon(TOC),high free hydrocarbon(S1)and high pyrolytic hydrocarbon(S2),while argillaceous siltstone has the weakest hydrocarbon generation potential;The highquality shale reservoir space is mainly composed of inorganic pores,organic pores and microfractures,and its main mineral types are quartz and clay minerals,with good reservoir performance and fracability.The following understandings have been obtained from the further analyses:The dominated highquality lacustrine shale of Lianggaoshan Formation are mainly controlled by sedimentary environment and formed in reducing environment with deeper water bodies,which is conducive to the organic matter burial and preservation.The larger thickness of the strata makes it difficult for shale oil&gas to overcome the migration resistance and is mastly retained in the middle of the source rocks,and a small amount of oil&gas in the upper and lower shales may partially have expulsion and migration under pressure.It is concluded that the lacustrine shale of Lianggaoshan Formation in northeastern Sichuan Basin has the moderate degree of organic matter evolution,good microf

关 键 词：页岩油气 川东北地区 凉高山组 烃源岩 地球化学 岩石热解 扫描电镜 

分 类 号：TE132.1[石油与天然气工程—油气勘探]