鄂尔多斯盆地泾河油田长7_(3)亚段页岩油地质评价  

Geological evaluation of Chang 73 shale oil in Jinghe Oilfield, Ordos Basin

作　　者：伍岳 刘传喜[1] 夏东领[1] 付育璞[1] 夏冬冬[1] 李庆[2] WU Yue;LIU Chuanxi;XIA Dongling;FU Yupu;XIA Dongdong;LI Qing(SINOPEC Petroleum Exploration and Development Research Institute,Beijing 100083,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《天然气地球科学》2024年第7期1214-1222,共9页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2017ZX05049-006)资助。

摘　　要：综合岩心、薄片、扫描电镜及各类实验测试资料,对鄂尔多斯盆地南缘泾河油田延长组长7_(3)页岩油开展地质特征分析及资源潜力评价。主要认识如下:长7_(3)页岩层系纵向上发育3套岩相组合,从底到顶依次为厚层凝灰岩夹薄层页岩组合、厚层页岩夹薄层凝灰岩组合及页岩、凝灰岩、粉细砂岩薄互层组合,反映了静水悬浮与重力流交互的混合沉积过程;有机质丰度高,TOC平均含量为14%,类型以Ⅰ—Ⅱ_(1)型为主,成熟度RO值介于0.6%~0.8%之间,部分已进入主生烃期;凝灰岩夹层平均孔隙度为7.19%,宏孔占比高,是最有利的储层类型,其次为富有机质硅质页岩和黏土质页岩,页岩孔隙类型以粒间孔、粒内孔及晶间孔等无机孔隙为主;页岩总油含量高,S_(1)+S_(2)值平均为16.6 mg/g,游离油占比低,平均为32%,页岩油主要以吸附态赋存于黏土矿物或干酪根表面;初步估算研究区页岩油地质资源总量约为9.17×10^(8)t,其中游离油资源量约为3.42×10^(8)t,资源品位一般,总体属于中国石化页岩油资源评价标准下的Ⅲ类;研究区东北部页岩厚度大、有机碳含量高、成熟度高、生烃潜力大,是下一步重点勘探目标区。Based on core,thin section,scanning electron microscope and various experimental test data,a sys⁃tematic study has been carried out on the Chang 73 shale series in the Yanchang Formation,Jinghe Oilfield,the southern margin of Ordos Basin,and the geological characteristics,exploration potential and next exploration direction of shale oil have been clarified.The main understanding is as follows:Three types of lithofacies combi⁃nations are developed in Chang 73 shale series longitudinally,which are thick tuff with thin shale,thick shale with thin tuff,and shale.The thin interbed type of tuff and siltstone reflects the interactive sedimentation pro⁃cess of hydrostatic suspension and gravity flow;the abundance of organic matter is high,reaching the level of rich carbon and high carbon.The kerogen type is mainlyⅠ-Ⅱ_(1),and the maturity R_(o) is 0.6%-0.8%.Some shale enters the main hydrocarbon generation stage;the pore type of the reservoir is dominated by inorganic pores such as intergranular pores,intragranular pores and intercrystalline pores.The organic matter pores are underde⁃veloped,in which the tuff macropores account for a high proportion and the porosity is large,with an average of 7.19%,which is the most favorable reservoir type,followed by organic rich siliceous shale and clayey shale;Shale oil occurs in inorganic pores or clay minerals and kerogen surfaces in free,adsorbed and dissolved forms.The total oil content is high,but the proportion of free oil is low,averaging 32%,which is related to the low degree of thermal evolution.According to preliminary estimation,the total amount of shale oil geological re⁃sources in the study area is about 917 million tons,including 342 million tons of free oil resources.The resource potential is large,but the resource taste is general,and it generally belongs to category III under the SINOPEC shale oil evaluation standard.The northeast of the work area is about 400 km^(2),with large shale thickness,high organic carbon content,high maturity,and large hydrocar

关 键 词：鄂尔多斯盆地 页岩油 地质评价 长73 中低成熟度 

分 类 号：TE122.113[石油与天然气工程—油气勘探]