摘要
鄂尔多斯盆地西缘麻黄山地区延长组长8段属于典型的致密砂岩油藏,物性差、油层低阻、流体识别困难等导致无法高效勘探开发。为此,文中根据岩心测试、地层水分析、核磁实验和全岩矿物X射线衍射等资料,开展油层低阻主控因素分析和储层含油性指示参数表征研究。基于低阻主控成因、储层含油性和流体可动性,创建了致密砂岩流体识别方法。研究认为,高地层水矿化度是造成油层低阻的主控因素,高束缚水饱和度和黏土矿物附加导电也为重要因素。采用自然电位法计算得出地层水电阻率,进而求取含油饱和度(S_(o)),利用双视地层水电阻率比值法建立含油指示因子(OI),构建可动油指示因子(MOI)表征可动流体孔隙度中的含油量。利用孔隙度、OI、S_(o)和MOI参数间的交会分析,创建流体识别标准。新方法相较传统方案有较高流体识别精度,符合率达90%。研究成果为同类型油藏的流体识别提供了理论和方法参考。
Chang 8 Member of Yanchang Formation in Mahuangshan area on the western margin of Ordos Basin is a typical tight sandstone reservoir,which can not be efficiently explored and developed due to poor physical properties,low-resistivity oil layers and difficulty in fluid identification.Therefore,based on datas from core tests,formation water analysis,nuclear magnetic experiments,and whole-rock mineral X-ray diffraction,this paper conducts research on the main controlling factors of low-resistivity oil layers and the parameters characterization of reservoir oil-bearing indicative properties.Based on the low-resistivity main controlling genesis,reservoir oil-bearing and fluid mobility,a fluid identification method for tight sandstone was established.The research shows that the high salinity of formation water was the main controlling factor for low-resistivity oil layers,while high saturation of bound water and the additional conductivity of clay minerals were also important factors.The resistivity of formation water was calculated by the spontaneous potential method,followed by the oil saturation(S_(o)).The oil-bearing indicator(OI)was established by using the dual-apparent formation water resistivity ratio method,and the movable oil indicator(MOI)was constructed to characterize the oil-bearing in movable fluid porosity.Fluid identification standard was created using intersection analysis between porosity,OI,S_(o) and MOI parameters.New method had a higher fluid identification accuracy compared with the traditional scheme,with a compliance rate of 90%.The research results provide theoretical and a methodological references for fluid identification of the same type of reservoirs.
作者
宿伟
高杰
吴文圣
王帅
赵子龙
王晓壮
彭丽君
SU Wei;GAO Jie;WU Wensheng;WANG Shuai;ZHAO Zilong;WANG Xiaozhuang;PENG Lijun(College of Geophysics,China University of Petroleum(Beijing),Beijing 102249,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 102206,China;School of Earth Science and Engineering,Xi′an Shiyou University,Xi′an 710065,China)
出处
《断块油气田》
北大核心
2026年第1期74-81,共8页
Fault-Block Oil & Gas Field
基金
中国石油科技创新基金项目“深部流体相关Re-Os和U-Pb同位素定年及油气地质意义”(2024DQ02-0104)。
关键词
低阻油层
流体识别
地层水矿化度
长8段
麻黄山地区
鄂尔多斯盆地
low-resistivity oil layer
fluid identification
formation water salinity
Chang 8 Member
Mahuangshan area
Ordos Basin
