靖边油田S井区长6段致密砂岩储层分类评价  

Classification and Evaluation of Chang 6 Member Tight Sandstone Reservoir in S Well Area of Jingbian Oilfield

作　　者：张文 张凤奇 孙越 郭圆圆 杜轩 冀昊宇 茹荣 ZHANG Wen;ZHANG Fengqi;SUN Yue;GUO Yuanyuan;DU Xuan;JI Haoyu;RU Rong(Xi′an Shiyou University,Xi′an 710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi′an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《河北地质大学学报》2025年第2期59-66,共8页Journal of Hebei Geo University

基　　金：陕西省自然科学基础研究计划项目(2017JM4004);西安石油大学创新与实践能力培养(YCS23213069)。

摘　　要：靖边油田S井区长6段油层组,其储层致密、孔隙结构复杂且后期产量递减快稳产难。因此通过铸体薄片、扫描电镜和高压压汞等测试分析手段结合录井、试油等资料,对长6段储层岩石学特征、物性特征和孔隙结构进行了研究。结果表明,研究区长6段储集层岩性主要以中—细粒的岩屑长石砂岩和长石砂岩为主,储集空间以粒间孔和次生溶孔为主,孔隙与渗透率之间相关关系差。以孔隙度为8.5%,渗透率为0.2×10^(-3)μm^(2)作为物性下限,并结合前人致密砂岩储层分类标准将S井区长6段储层划分为Ⅱ_(b)(好)、Ⅲ_(a)(中等)和Ⅲ_(b)(差)3类,为研究区长6段下一步油气勘探以及开发策略的调整提供理论基础。The Chang 6 formation in the S well area of Jingbian Oilfield has dense reservoir,complex pore structure and difficult production decline in the later stage.Therefore,in this paper,the petrological and physical properties and pore structure of Chang 6 reservoir were studied by means of casting thin section,scanning electron microscope and high-pressure mercury injection analysis and testing combined with logging and oil test data.The results show that the lithology of the Chang 6 reservoir in the study area is mainly composed of medium-fine lithic feldspar sandstone and feldspar sandstone.The reservoir space is dominated by intergranular pores and secondary dissolved pores,and the correlation between pores and permeability is poor.Taking the porosity of 8.5%and the permeability of 0.2×10^(-3)μm^(2)as the lower limit of physical properties,combined with the previous classification criteria of tight sandstone reservoirs,the Chang 6 reservoir in S well area is divided into three categories:Ⅱ_(b)(good),Ⅲ_(a)(medium)andⅢ_(b)(poor).It provides a theoretical basis for the next step of oil and gas exploration and development strategy adjustment in the study area.

关 键 词：靖边油田 致密砂岩储层 长6段 储层分类 

分 类 号：TE122[石油与天然气工程—油气勘探]