鄂尔多斯盆地庆城地区三叠系长7段烃源岩特征及控藏作用  

Characteristics and reservoir control of source rocks of Triassic Chang 7 member in Qingcheng area,Ordos Basin

作　　者：王子昕 柳广弟[3] 袁光杰 杨恒林 付利 王元 陈刚 张恒[1,2] WANG Zixin;LIU Guangdi;YUAN Guangjie;YANG Henglin;FU Li;WANG Yuan;CHEN Gang;ZHANG Heng(CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;National Engineering Research Center of Oil&Gas Drilling and Completion Technology,Beijing 102206,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京102206 [2]油气钻完井技术国家工程研究中心,北京102206 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《岩性油气藏》2024年第5期133-144,共12页Lithologic Reservoirs

基　　金：中国石油天然气集团有限公司油气和新能源项目“新能源-工程技术跟踪评价”(编号:2023YQX415)资助。

摘　　要：鄂尔多斯盆地三叠系长7段是页岩油的重点研究领域。通过总有机碳测定、氯仿抽提、岩石热解、XRD全岩矿物分析、扫描电镜观察等,对鄂尔多斯盆地庆城地区三叠系长7段烃源岩特征进行了分析,并利用多元回归线性法建立了有机碳与测井曲线的三维电测模型,明确了烃源岩的空间展布特征及其的控藏作用。研究结果表明:(1)鄂尔多斯盆地庆城地区三叠系长7_(1)、长7_(2)和长7_3小层泥页岩样品TOC平均值分别为5.01%,6.04%和6.76%,氯仿沥青“A”的平均值分别为0.63%,0.67%和0.73%,整体有机质类型以Ⅱ_(1)型和Ⅱ_(2)型为主,处于成熟—高成熟阶段,含油性与可动性均较好,达到较好—极好烃源岩级别。(2)研究区泥页岩样品主要由石英长石与黏土矿物组成,孔隙类型主要为原生粒间孔、晶间孔及有机质收缩缝,但各样品的孔径分布不同。(3)研究区烃源岩TOC下限为1.50%,庆城地区附近长7_(2)小层、庆城与环县地区附近长7_(3)小层为主要有效烃源岩发育区。(4)有效烃源岩的TOC含量及其空间展布特征影响了页岩油藏的含油性,其中TOC含量直接决定了产油量的高低。距离生烃中心越近越有利于油气聚集。The Chang 7 member of Triassic in Ordos Basin is a key research area for shale oil.Through the determination of total organic carbon,chloroform extraction,rock pyrolysis,XRD whole rock mineral analysis,and scanning electron microscopy observation,the characteristics of source rocks of Triassic Chang 7 member in Qingcheng area of Ordos Basin were analyzed.A three-dimensional electrical logging model of organic carbon and logging curves was established by using multiple regression linear method,clarifying the spatial distribution characteristics of the source rocks and their reservoir control effects.The results show that:(1)The average TOC values of shale samples from Chang 7_(1),Chang 7_(2) and Chang 7_(3) submembers in Qingcheng area of Ordos Basin are 5.01%,6.04%and 6.76%,respectively,and the average values of chloroform bitumen“A”are 0.63%,0.67%and 0.73%,respectively.The overall organic matter types are mainly typeⅡ_(1) and typeⅡ_(2),which are in mature to high-mature stage.The oil content and mobility are good,reaching a good to excellent source rock level.(2)The shale samples are mainly composed of quartz feldspar and clay minerals.The pore types are mainly primary intergranular pores,intercrystalline pores and constricted fissures in organic matters,but the pore size distribution of each sample is different.(3)The lower limit of TOC in source rocks in the study area is 1.50%.The 7_(2) submember near Qingcheng area and the 7_(3) submember near Qingcheng and Huanxian areas are the main effective source rock development areas.(4)The TOC content and spatial distribution characteristics of effective source rocks affect the oil content of shale reservoirs,and the TOC content directly determines the level of oil production.

关 键 词：页岩油 多元回归 有机碳预测 烃源岩展布 成熟—高成熟阶段 长7段 三叠系 庆城地区 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]