神木地区解家堡区块山西组储层“四性”关系及有效储层下限  

Four property relation and lower limit of effective reservoir of Shanxi Formation in Jiejiapu Block,Shenmu area,Ordos Basin

作　　者：牛艳伟 吴鹏[1] NIU Yanwei;WU Peng(China United Coalbed Methane Co.,Ltd.,Beijing 100011,China)

机构地区：[1]中联煤层气有限责任公司,北京100011

出　　处：《成都理工大学学报（自然科学版）》2023年第5期513-524,550,共13页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金资助项目(42072194,U1910205);国家科技重大专项资助项目(2016ZX05066)。

摘　　要：针对致密砂岩储层物性差、“四性”关系复杂使得气水层识别难度大的问题,以鄂尔多斯盆地神木地区解家堡区块山西组为例,通过薄片、试气、岩心以及测井资料的收集、整理、对比分析,研究储层四性关系并确定有效下限。结果表明:山西组储层岩性以中细粒岩屑砂岩为主,属于致密储层,储层的岩性与物性、含气性,电性有较好的响应。建立了测井解释模型,确定了山1段与山2段孔隙度下限值均为5%;山1段渗透率下限值为0.07×10^(-3)μm^(2),山2段渗透率下限值为0.06×10^(-3)μm^(2);山1段含气饱和度下限值为39%,山2段含气饱和度下限值为47%;山1段与山2段深感应电阻率下限值均为12Ω·m;山1段声波时差下限值为65μs/ft(1 ft=30.48 cm),山2段声波时差下限值为67μs/ft。山西组储层电性复杂主要受沉积作用、成岩作用、黏土矿物与岩石矿物、孔隙流体4个方面的影响。Through the collection,sorting and comparative analysis of thin sections,gas test,core and well logging data,this paper studies the four property relationships of Shanxi Formation in Jiejiapu Block,Shenmu area,Ordos Basin,and determines the effective lower limit,aiming to solve the problems of poor physical property,complex four property relationship and difficulty in identification of gas and water layers in Shanxi Formation tight sandstone reservoirs.The results show that the Shanxi Formation reservoir is mainly composed of medium-fine grained lithic sandstone characteristic of tight reservoir.The lithology of the reservoir responds well to physical property,gas bearing property and electrical property.The established logging interpretation model reveals that the lower porosity limit of Shan-1 member and Shan-2 member is 5%,the lower permeability limit of Shan-1 member and Shan-2 member is 0.07×10^(-3)μm^(2)and 0.06×10^(-3)μm^(2)respectively.The lower limit value of gas saturation in Shan-1 member and Shan-2 member is 39%and 47%respectively.The lower limit value of deep sensing resistivity of Shan-1 and Shan-2 member is 12ωm,the lower limit of the acoustic time difference of the Shan-1 member and Shan-2 member is 65μs/ft(1 ft=30.48 cm)and 67μs/ft respectively.It is recognized that the electrical complexity of Shanxi Formation reservoir is mainly affected by such factors as sedimentation,diagenesis,clay minerals,rock minerals and pore fluids.

关 键 词：山西组 储层“四性”关系 鄂尔多斯盆地 致密砂岩 储层下限 

分 类 号：TE15[石油与天然气工程—油气勘探] TE12