张家滩地区长6油层组储层对致密油富集的控制作用  

Control effect of reservoirs on tight oil distribution-a case study ofChang 6 oil layer group in Zhangjiatan area of Ordos Basin

作　　者：鲁萌萌 汤延帅 LU Mengmeng;TANG Yanshuai(College of Earth Science and Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an 710065,Shaanxi,China;Qilicun Oil Production,Yanchang Oilfield Co.,Ltd,Yanan 716000,Shaanxi,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 [3]延长油田股份有限公司七里村采油厂,陕西延安716000

出　　处：《石油地质与工程》2024年第4期58-62,68,共6页Petroleum Geology and Engineering

基　　金：陕西省教育厅科研计划项目“鄂尔多斯盆地志丹地区长9、长10致密油形成机理研究”(18JS090);陕西省自然科学基础研究计划项目“湖相富有机质页岩储集空间定量表征及含油性研究”(2017JM4014)联合资助

摘　　要：利用岩性、物性、高压压汞数据以及铸体薄片、扫描电镜资料并结合测井、试油和试采数据,分析张家滩地区长6油层组储层对致密油富集的控制作用。结果表明:长6储层含油岩性为细砂岩,粉砂岩不含油;油层厚度与砂体厚度呈现正相关关系,平面上集中分布于中西部和南部地区;孔隙结构主要分为两类:I类为细孔微细喉,以油浸、油斑级为主,Ⅱ类为细-微孔、微细喉-微喉,以油迹和荧光级别为主;各种成岩作用和沉积环境导致较强的储层非均质性,控制了石油的差异富集;层内非均质性形成相对高孔高渗砂体并控制致密油的聚集部位,平面非均质性导致油层厚度大的区域主要分布在砂体厚度大且稳定的区域。Based on lithology,physical properties,high pressure mercury injection data,casting sheet,scanning electron microscopy data,combined with well logging,oil test and production test data,the control effect of reservoir on Chang 6 tight oil distribution was analyzed.The results show that the oil-bearing lithology of Chang 6 reservoir in Zhangjiatan is fine sandstone,while the siltstone does not contain oil.There is a positive correlation between the thickness of oil layers and the thickness of sand bodies,which is concentrated in the central,western,and southern regions on a plane.The pore structure is mainly divided into two categories,with Class I being fine pore and micro throat,dominated by oil leaching and oil spot levels,Class II being fine-microporous and microfine throat-microthroat,dominated by oil traces and fluorescent.Various diagenetic processes and sedimentary environments result in strong reservoir heterogeneity,controlling the differential enrichment of oil.Heterogeneity within the layer forms relatively high porosity and high permeability sand bodies and controls the accumulation of tight oil.While planar heterogeneity results in areas with large oil layer thickness mainly distributed in areas with large and stable sand body thickness.

关 键 词：鄂尔多斯盆地 张家滩地区 长6油层组 致密油 

分 类 号：TE112.23[石油与天然气工程—油气勘探]