鄂尔多斯盆地东南部盒8段优质储层发育特征及影响因素  

The development characteristics and influencing factors of high-quality reservoirs in the 8th member of Shihezi Formation in the eastern Ordos Basin

作　　者：杜贵超 刘峻峰[3] 郭睿良 李耀龙 尹洪荣[5] 黄杏雨[1,2] 王凤琴 DU Guichao;LIU Junfeng;GUO Ruiliang;LI Yaolong;YIN Hongrong;HUANG Xingyu;WANG Fengqin(College of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Key Laboratory of Petroleum and Gas Reservoir,Xi'an Shiyou University,Xi'an 710065,China;No.5 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi'an 710200,China;Changqing Oilfield Branch Changqing Industrial Group Co.,Ltd.,Xi'an 710018,China;Erploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi'an 710018,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]中国石油长庆油田分公司第五采油厂,陕西西安710200 [4]长庆油田分公司长庆实业集团有限公司,陕西西安710018 [5]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《天然气地球科学》2025年第2期271-283,共13页Natural Gas Geoscience

基　　金：国家科技重大专项“陆相页岩气成藏主控因素及‘甜点’预测”(编号:2017ZX05039-001)资助。

摘　　要：优质储层发育特征及形成机理是认识中—深埋藏储层形成演化的关键问题,也是致密砂岩油气藏高效勘探和经济有效开发的重要基础。通过钻井岩心、测井资料及孔渗、薄片、SEM等分析资料,对鄂尔多斯盆地东部盒8段储层系统开展了优质储层发育特征及影响因素研究。结果表明:研究区盒8段主要发育石英砂岩、岩屑石英砂岩及岩屑砂岩3种储层岩石学类型。石英砂岩及岩屑石英砂岩物性条件较好,为潜在的优质储层;沉积作用是盒8段优质储层发育的基础,主要表现为碎屑组分颗粒越粗、分选越好、刚性颗粒含量越高越有利于原始粒间孔的保存;成岩作用是优质储层发育及演化的核心因素。盒8段早期快速埋藏过程中,强烈机械压实及塑性颗粒的强烈变形导致砂岩孔隙大量、快速损失,是形成致密物性背景的主要原因。不同成岩期的碳酸盐、黏土矿物及硅质胶结堵塞颗粒孔喉空间,进一步破坏储层物性。同时,选择性溶蚀作用有效改善了致密砂岩储集性能,对优质储层形成起到积极贡献。孔隙演化模式表明,受地层早期快速埋藏的影响,盒8段储层在早成岩A1期即遭受了强烈压实,形成了致密物性背景。溶蚀作用主要发育在中成岩A2期,为次生孔隙主要发育阶段,中成岩B期为晚期自生胶结物发育期,部分残余粒间孔及溶蚀孔被充填,砂岩进一步致密化。The study of the development characteristics and formation mechanism of high-quality reservoirs is a key issue in understanding the formation and evolution of medium-deep buried reservoirs,and is also an important foundation for the efficient exploration and economic and effective development of tight sandstone oil and gas reservoirs.Based on drilling core,logging data,porosity-permeability,thin section,SEM and other analytical data,the development characteristics and influencing factors of high-quality reservoirs in the 8th member of Shihezi Formation(He 8 Member)in the eastern Ordos Basin were studied.The results show:Firstly,the He 8 Member mainly develops three types of reservoir petrology:quartz sandstone,lithic quartz sandstone and lithic sandstone.Quartz sandstone and lithic quartz sandstone have better physical conditions and are potentially high-quality reservoirs.Secondly,sedimentation is the basis for the development of high-quality reservoirs in the He 8 Member,which is mainly manifested in the fact that the coarser the particles of the clastic components,the better the sorting,and the higher the content of rigid particles,the more favorable the preservation of the original intergranular pores.Thirdly,diagenesis is a crucial factor in the development and evolution of tight reservoirs.During the early rapid burial process of the He 8 Member,strong mechanical compaction and intense deformation of plastic particles resulted in a significant loss of pore space in the sandstone,which is the main cause of the formation of a tight physical background.Carbonate,clay minerals and siliceous cementation at different diagenesis stages block the pore-throat space of particles,further deteriorating the physical properties of the reservoirs.Meanwhile,under conditions of relatively low rock debris content,selective dissolution effectively improves the reservoir performance of tight sandstone and plays a positive role in the formation of high-quality reservoirs.Fourthly,the pore evolution pattern indicates that,under

关 键 词：盒8段 差异成岩演化 储层物性 优质储层 孔隙演化模式 

分 类 号：TE122.1[石油与天然气工程—油气勘探]