准噶尔盆地吉木萨尔凹陷二叠系芦草沟组致密油储层成岩作用与储集空间特征  

Diagenesis and Reserving Space Characteristics of Tight Oil Reservoirs of Permian Lucaogou Formation in Jimusar Sag of Junggar Basin, China

作　　者：操应长[1,2] 朱宁 张少敏 葸克来 薛秀杰[1] CAO Ying-chang;ZHU Ning;ZHANG Shao-min;XI Ke-lai;XUE Xiu-jie(School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China;Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, Shandong, China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《地球科学与环境学报》2019年第3期253-266,共14页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金委员会-中国石油天然气集团公司石油化工联合基金项目(U1762217);国家重点基础研究发展计划("九七三"计划)项目(2014CB239002)

摘　　要：利用岩芯观察、铸体薄片及荧光薄片鉴定,结合激光共聚焦显微镜、扫描电镜、X射线衍射、恒速压汞等分析测试手段,分析了准噶尔盆地吉木萨尔凹陷二叠系芦草沟组致密油储层成岩作用与储集空间特征及其相互关系。结果表明:吉木萨尔凹陷芦草沟组致密油储层主要发育碳酸盐岩类、陆源碎屑岩类、火山碎屑岩类和混积岩类等4种岩石类型,储集空间可分为次生溶孔、晶间孔和微裂缝3类;不同岩石类型经历了不同的成岩作用过程,发育了不同类型的储集空间。①碳酸盐岩类中,泥晶云岩成分单一,压实致密,胶结作用弱,储集空间以白云石晶间孔为主;随着粉砂质和凝灰质含量增加,压实作用变弱,长石和凝灰质发生强溶蚀,粉砂质砂屑云岩及凝灰质云岩的储集空间以长石粒内孔、铸模孔及凝灰质溶蚀孔为主。②陆源碎屑岩类中,凝灰质粉砂岩的压实作用中等,粉砂级长石颗粒粒内及边缘、分散状凝灰质溶蚀,且溶蚀孔中有大量的黏土矿物充填,储集空间以蜂窝状长石溶蚀孔、凝灰质溶蚀孔为主;而云质泥岩压实作用强,溶蚀作用不发育,仅可见晶间孔及微裂缝。③火山碎屑岩类中,粉砂质凝灰岩、云质凝灰岩压实作用中等,长石、凝灰质易溶,但胶结物种类较多,储集空间以次生溶蚀孔为主,发育少量的晶间孔。The core observation, casting and fluorescence thin section authentication, combined with confocal laser scanning microscope(CLSM), scanning electron microscope(SEM), X-ray diffraction and rate-controlled mercury intrusion, were employed to characterize tight oil reservoir space properties of Permain Lucaogou Formation in Jimusar sag of Junggar Basin, China, aiming at analyzing the diagenesis, reservoir space and relationship between them. The results show that tight oil reservoir of Lucaogou Formation in Jimusar sag is mainly composed of carbonate, terrigenous detrital, pyroclastic and normal mixed sedimentary rocks, and the reservoir spaces include secondary solution pores, intercrystalline pores and microcracks;the different types of rock undergo different diagenesis processes and develop different reservoir spaces.①In the carbonate rocks, micritic dolostones are characterized by single component, severe compaction and weak cementation, and the reservoir space is dominated by dolomite intercrystalline pores;with the increasing of silty and tuffaceous contents, the silty arenites and tuffaceous dolostones are characterized by weaker compaction, stronger dissolution and cementation, and the reservoir space is mainly composed of feldspar inner pores, mold holes and tuffaceous dissolution pores.②In the terrigenous detrital rocks, tuffaceous siltstones are characterized by moderate compaction, and widespread dissolution of feldspar and dispersive tuffaceous, the dissolution pores are filled by a great amount of clay mineral, and the reservoir space is mainly composed of honeycomb feldspar dissolution pores and tuffaceous dissolution pores;the dolomitic mudstones are characterized by strong compaction and poor dissolution, and intercrystalline pores and microcracks can be observed in it.③In pyroclastic rocks, the characteristics of silty and dolomitic tuffites are similar to those of tuffaceous siltstones, but the kinds of cement are a lot, the main reservoir spaces are secondary dissolution pore with a few in

关 键 词：致密油储层 成岩作用 储集空间 物性 成岩差异 芦草沟组 吉木萨尔凹陷 准噶尔盆地 

分 类 号：P618.13[天文地球—矿床学]