鄂尔多斯盆地周家湾地区长4+5储层特征及控制因素分析  

Analysis of the characteristics and controlling factors of the Chang 4+5 reservoir in Zhoujiawan area,Ordos Basin

作　　者：卢达 吴颖 周凯[3] LU Da;WU Ying;ZHOU Kai(School of Earth Sciences and Engineering,Xi′an Shiyou University,Xi′an,710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi′an Shiyou University,Xi′an,710065,China;Yanchang Oilfield Company Limited,Yan′an 716000)

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]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]延长油田股份有限公司,陕西延安716000

出　　处：《地下水》2024年第2期141-143,共3页Ground water

摘　　要：本文收集整理了周家湾地区延长组长4+5储层的岩心观察,扫描电镜和压汞等测试资料,从岩石学,物性,孔隙类型及结构特征等方面,统计分析了研究区长4+5储层特征及影响储层特征的主要控制因素。结果表明,研究区主要是三角洲前缘亚相中水下分流河道和水下分流间湾微相;区内长4+5储层受沉积作用影响,储层物性最好的区域分布在水下分流河道砂体,物性特征表现为以残余原生粒间孔为主;受成岩作用影响,岩石被压实而致密化,如绿泥石早期环边稳定,孔渗条件难改变,后期环边堵塞喉道使孔渗变差,碳酸盐胶结物降低原生粒间孔、储层孔渗性,但因增加了骨架颗粒强度而部分阻止压实作用;溶蚀作用改善储层孔渗条件。研究区长4+5储层属特低孔隙度,特低渗透率储层。In this paper,the core observation,scanning electron microscope and mercury injection test data of Chang 4+5 reservoir of Yanchang Formation in Zhoujiawan area are collected and sorted out,and the characteristics of Chang 4+5 reservoir and the main controlling factors affecting the reservoir characteristics are statistically analyzed from the aspects of petrology,physical properties,pore types and structural characteristics.The results show that the study area is mainly submerged divergent channel and submerged divergent interbay microphase in the delta front subphase;the Chang 4+5 reservoir in the area is affected by sedimentation,and the best reservoir physical properties are distributed in the submerged divergent channel sand body,and the physical characteristics are dominated by residual primary intergranular pores;influenced by diagenesis,the rocks are compacted and densified,such as chlorite early ring edge stability,pore permeability conditions are difficult to change,and later The carbonate cement reduces the primary intergranular pores and reservoir pore permeability,but partly prevents compaction by increasing the strength of skeletal particles;dissolution improves the reservoir pore permeability.The Chang 4+5 reservoir in the study area is an extra-low porosity,extra-low permeability reservoir.

关 键 词：控制因素 储层特征 延长组长4+5 周家湾地区 鄂尔多斯盆地 

分 类 号：P618.130.21[天文地球—矿床学]