四川盆地灯影组多类型流体多期次改造作用下孔隙度演化的定量研究  

Quantitative study on porosity evolution under multi-stage reformation of multi-type fluids in Dengying Formation,Sichuan Basin

作　　者：杨磊磊 魏国 于志超 鲁雪松[2,4] 周慧 王珊[4] 李昌伟[5] YANG Leilei;WEI Guo;YU Zhichao;LU Xuesong;ZHOU Hui;WANG Shan;LI Changwei(State Key Laboratory of Petroleum Resource and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;National Energy Tight Oil&Gas Research&Development Center,Beijing 100083,China;Unconventional Oil and Gas Science and Technology Research Institute,China University of Petroleum(Beijing),Beijing 102249,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Research Institute of Petroleum Exploration&Development in PetroChina Southwest Oil&Gas Oilfield Company,Chengdu 610041,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]国家能源致密油气研发中心,北京100083 [3]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [4]中国石油勘探开发研究院,北京100083 [5]中国石油西南油气田勘探开发研究院,四川成都610041

出　　处：《中国石油大学学报（自然科学版）》2024年第3期15-26,共12页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中石油重点实验室开放课题(2023-KFKT-08);国家自然科学基金项目(42372143);中国石油大学(北京)人才基金(2462023BJRC030);中国石油天然气股份有限公司重大科技专项(2023ZZ02)。

摘　　要：选取四川盆地灯影组四段(灯四段)地层,在传统地质研究的基础上,引入多组分、多相态、温度—流体—化学多场耦合的反应溶质运移模拟技术,基于物质平衡和能量守恒原理,深入探究深层碳酸盐岩储层成岩过程中多类型流体与岩石相互作用的机制,分析计算多期次流体对储层孔隙的叠加改造,定量恢复地质时间尺度的孔隙度演化史。结果表明:灯四段地层受到大气淡水、海水、有机酸和热液4种流体多达6期改造影响,控制孔隙度的主要成岩作用为溶蚀作用、白云石化作用与胶结作用,矿物间以方解石—镁方解石—白云石之间的转化为主;不同类型的流体对储层的改造差异较大,充足的大气淡水为建设性流体,而海水、有机酸和热液均为建设性—破坏性共存的流体;多期次流体对储层的改造有叠加效应,储层最终的物性条件取决于多期次流体的综合改造,同时流体改造的顺序对储层孔隙度的演变影响也极大。In this study,the fourth member of Dengying Formation in Sichuan Basin was examined.On the basis of traditional petrological testing,the reactive solute transport simulation technology was utilized to calculate the superposition and transformation of reservoir pores due to multi-stage fluids and quantitatively restore the porosity evolution history.Results indicate that the reservoir experienced influences from atmospheric freshwater,seawater,organic acid,and hydrothermal fluid.The primary diagenetic processes controlling porosity were dissolution,dolomite formation and cementation,with transformed minerals primarily comprising calcite,magnesium calcite,and dolomite.Different fluid types exhibited varying effects on reservoir reconstruction.Adequate atmospheric fresh water acted as a constructive fluid,while seawater,organic acids,and hydrothermal fluids had both constructive and destructive impacts.Multi-stage fluids contributed to a superimposed effect on the reservoir transformation,with the ultimate physical conditions of the reservoir contingent upon the comprehensive transformation of these fluids.Notably,the sequence of fluid modification significantly influenced the evolution of reservoir porosity.Simutaneously,the sequence of fluid transformation played a pivotal role in shaping the evolution of reservoir porosity.

关 键 词：深层碳酸盐岩储层 多类型流体 叠加改造 孔隙度演化 成岩作用数值模拟 

分 类 号：TE121[石油与天然气工程—油气勘探]