鄂尔多斯盆地苏75区块中部盒8段储层特征及主控因素  

Characteristics and main controlling factors of He 8 Member reservoir in the middle of Block Su75,Ordos Basin

作　　者：赵立平 李祖兵 付亮亮 潘秀英 郭宁 王猛 ZHAO Liping;LI Zubing;FU Liangliang;PAN Xiuying;GUO Ning;WANG Meng(Sulige Exploration and Development Branch,Huabei Petroleum Administration Bureau Co.,Ltd.,PetroChina,Wushenqi 017300,China;Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development(Chongqing University of Science and Technology),Chongqing 401331,China)

机构地区：[1]中国石油华北石油管理局有限公司苏里格勘探开发分公司,内蒙古乌审旗017300 [2]复杂油气田勘探开发重庆市重点实验室(重庆科技大学),重庆401331

出　　处：《断块油气田》2025年第1期88-95,共8页Fault-Block Oil & Gas Field

基　　金：中石油创新基金项目“深部优质火山岩储层成因机理研究”(2013D-5006-0104);重庆市重点产业共性关键技术创新专项“盆缘山区页岩气赋存特征及页岩气资源评价”(cstc2016zdcy-zd90001);中石油华北石油管理局有限公司苏里格勘探开发分公司与重庆科技大学校企合作项目“苏75区块储层精细描述研究”(HBSYT-SLG-2022-JS-122)。

摘　　要：文中基于岩心、薄片鉴定、物性测试及区域地质资料,对鄂尔多斯盆地苏75区块中部盒8段的储层特征及主控因素进行了研究。结果表明:苏75区块盒8段致密砂岩储层主要发育石英砂岩及少量的岩屑石英砂岩和长石岩屑砂岩,局部可见含砾砂岩;储层主要表现为特低孔超低渗特征,部分为低孔低渗;储集空间为各类溶蚀孔隙、溶蚀缝和少量的原生孔隙,但溶蚀孔隙占比超过90%;不同岩相及沉积相中的储层物性差异较大,其中含砾粗砂岩的物性较其他岩性好,河道沉积微相中的储层较心滩微相及泛滥平原好;压实作用使得最初沉积时的孔隙度平均减小了22.36百分点,胶结作用使得原生孔隙度平均丧失了22.50百分点,溶蚀作用使得储层的孔隙度平均增加了15.80百分点;构造作用使得盒8段地层遭受多次不均匀抬升,形成了多条穿越盒8段的断层,地下流体沿着断层流动并与岩石发生各种溶蚀作用,进而扩大了储集空间,增强了储层的渗流能力。Based on core,thin section identification,physical property testing and regional geological data,the characteristics and main controlling factors of He 8 Member reservoir in the middle of Block Su75,Ordos Basin are studied.The results show that the dense sandstone reservoir of He 8 Member in Block Su75 mainly develops quartz sandstone with a small amount of debris quartz sandstone and feldspar debris sandstone,and gravel sandstone can be seen in local areas.The reservoir is mainly characterized by ultra-low porosity and ultra-low permeability,with some parts exhibiting low porosity and low permeability.The reservoir space is composed of all kinds of dissolved pores,dissolved fractures and a small number of primary pores,but the dissolved pores account for more than 90%of the reservoir space.There are great differences in physical properties in different rock facies and sedimentary facies.Among them,the physical properties of conglomerate rough sandstone are better than that of others,and reservoirs in river channel sedimentary microfacies are better than that of mid-channel bar microfacies and flood plains.Compaction resulted in an average reduction of 22.36%in porosity during initial sedimentation,while cementation caused an average loss of 22.50%in primary porosity,and dissolution resulted in an average increase of 15.80%in porosity of the reservoir.Tectonic action caused multiple uneven uplifts in the strata of He 8 Member,forming multiple faults crossing He 8 Member.Underground fluids flowed along the faults and underwent various dissolution reactions with the rocks,thereby expanding the reservoir space and enhancing the flow capacity of the reservoir.

关 键 词：储层特征 主控因素 盒8段 苏75区块 

分 类 号：TE122.2[石油与天然气工程—油气勘探]