玛湖凹陷风城组页岩油赋存空间特征及可动性影响因素  

Occurrence Space and Mobility of Shale Oil in Fengcheng Formation,Mahu Sag,Junggar Basin

作　　者：杨旺旺 王振林[1,2] 苏静 胡旋[1] 黄玉越 赖锦 王贵文[3,4] YANG Wangwang;WANG Zhenlin;SU Jing;HU Xuan;HUANG Yuyue;LAI Jin;WANG Guiwen(Research Institute of Exploration and Development,Xinjiang Oilfield Company,Petro China,Karamay,Xinjiang 834000,China;China University of Petroleum(Beijing),School of Petroleum Engineering,Beijing 102249,China;China University of Petroleum(Beijing)School of Geosciences,Beijing 102249,China;China University of Petroleum(Beijing),State Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249 [4]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

出　　处：《新疆石油地质》2025年第2期192-200,共9页Xinjiang Petroleum Geology

基　　金：中国石油科技项目(2023ZZ15YJ02)。

摘　　要：为明确玛湖凹陷风城组页岩油赋存空间与可动性特征,利用岩石薄片、扫描电镜、核磁共振、全息扫描荧光光谱等实验,结合二维核磁共振测井,系统表征页岩储集层微观孔隙结构及原油赋存特征,剖析页岩油可动性影响因素。研究区风城组页岩储集空间主要包括粒间孔、晶间孔、溶蚀孔、有机质孔、微裂缝等,溶蚀孔与裂缝是页岩油的主要赋存空间。不同岩相类型储集层中的页岩油可动性差异明显,富含陆源碎屑粉砂条带的长英质页岩最优,白云质纹层发育的白云质页岩次之,而富黏土矿物的混合质页岩最差,有机质丰度、沉积组构、孔隙结构等是控制风城组页岩油可动性的关键因素。研究区页岩总有机碳含量为0.5%~1.5%时,含油饱和度指数达到最大区间,页岩油可动性较好。薄层状长英质页岩与纹层状白云质页岩中,发育以残余粒间孔和溶蚀孔为主的无机孔及微裂缝,大孔占比较高,易形成页岩油的优势赋存空间和渗流通道,有利于可动油富集。To clarify the occurrence space and mobility of the shale oil in the Fengcheng formation of the Mahu sag,Junggar Basin,the data of rock thin section,SEM and NMR,and experiments such as total scanning fluorescence were used,together with 2D NMR logging data,to systematically characterize the microscopic pore structure and crude oil occurrence characteristics of the shale reservoir,and identify the factors controlling oil mobility.The storage space of the shale reservoir of the Fengcheng formation in the study area is mainly composed of intergranular pores,intercrystalline pores,dissolution pores,organic pores,and microfractures,with dissolution pores and fractures in domi-nance.The mobility of shale oil varies significantly in reservoirs with different lithofacies.The best mobility is found in the felsic shale rich in terrigenous clastic silt-sand bands,followed by the dolomitic shale with well-developed dolomitic laminae,and the worst mobility is found in the mixed shale rich in clay minerals.Organic matter abundance,depositional fabric,and pore structure are key factors controlling the mobility of shale oil in the Fengcheng formation.When total organic carbon(TOC)content of the shale in the study area ranges from 0.5%to 1.5%,the oil saturation index reaches its maximum range,indicating good mobility of the shale oil.In thin-bedded felsic shale and laminated dolomitic shale,pores(mainly residual intergranular pores and dissolution pores)and microfractures are developed,with a high proportion of large pores,which facilitates the formation of favorable occurrence space and flow channels for shale oil,promoting the enrich-ment of mobile oil.

关 键 词：准噶尔盆地 玛湖凹陷 风城组 页岩 储集层 原油赋存状态 页岩油可动性 影响因素 

分 类 号：TE122.221[石油与天然气工程—油气勘探]