鄂尔多斯盆地M80井区延8段储层特征研究  

Study on Reservoir Characteristics of Yan 8 Reservoir in M80 Well Area in Ordos Basin

作　　者：王印章 赵永刚[1] 王博[1] WANG Yinzhang;ZHAO Yonggang;WANG Bo(School of Geosciences and Engineering Shaanxi Key Laboratory of Oil and Gas Accumulation Geology,Xi′an University of Petroleum,Xi′an 710065,China)

机构地区：[1]西安石油大学、地球科学与工程学院/陕西省油气成藏地质学重点实验室,西安710065

出　　处：《重庆科技学院学报（自然科学版）》2023年第2期27-32,57,共7页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家科技重大专项“中生界低渗透储层非均质性评价技术”(2016ZX05050006);陕西省自然科学基础研究计划项目“基于高光谱图像的碳酸盐岩岩溶识别及其表征研究”(2019JM-381)。

摘　　要：鄂尔多斯盆地延安组延8油层组是M80井区主力产油层位,已投产井区面临含水上升加快、稳产较困难等问题。为进一步保障后期开发工作的顺利进行,综合利用薄片资料、孔渗资料、压汞测试资料对M80井区储层特征作了系统研究。研究表明:延8油层组主要砂岩类型为长石岩屑砂岩和岩屑砂岩,主要孔隙类型为粒间孔、粒间溶孔、长石溶孔。根据孔渗等参数特征,确认研究区延8储层整体上属于中孔-中渗储层,发育期间主要经历了压实、胶结和溶蚀作用,其中溶蚀作用是改善研究区储层物性的主要因素。延8储层已达到中成岩阶段A期,M80井区延8_(1)段与延8_(2)段非均质性均较强。Yan 8 reservoir of Yan’an Formation is the main producing oil layer in M80 well area,while the well block that has been put into production faces problems such as rapid water cut rise and difficulty in stable production.In order to ensure better development in the later stage,the reservoir characteristics of M80 well area in southwestern Ordos Basin are systematically studied by using various means such as cast thin sections,porosity and permeability data and mercury injection experiment data.The results show that the sandstone types of Yan 8 reservoir group are mainly feldspathic lithic sandstone and lithic sandstone,and intergranular pores,intergranular dissolved pores and feldspar dissolved pores are the main pore types.According to the parameters such as porosity and permeability,it is considered that the Yan 8 reservoir in the study area belongs to the medium porosity and medium permeability reservoir as a whole,which has mainly underwent compaction-pressure dissolution,cementation and dissolution,and dissolution is the main factor to improve reservoir physical properties in the study area.It is concluded that the diagenetic evolution stage of Yan 8 reservoir in the study area reaches the middle diagenetic stage A.The heterogeneity of Yan 8_(1)and Yan 8_(2)in M80 well area is relatively strong.

关 键 词：M80井区 延8储层 储层特征 非均质性 

分 类 号：P618[天文地球—矿床学]