鄂尔多斯盆地环西—彭阳地区长8段储层流体性质测井判别方法  

Logging evaluation method for reservoir fluid properties of Chang 8 oil layer to the west of Tianhuan depression-Pengyang region of Ordos basin

作　　者：李栋 胡克来 张燕 赖锦[1,3] 王贵文[1,3] 王松 张祥龙 马源[1] 江程舟 LI Dong;HU Kelai;ZHANG Yan;LAI Jin;WANG Guiwenl;WANG Song;ZHANG Xianglong;MA Yuan;JIANG Chengzhou(College of Geosciences,China University of Petroleum,Beijing 102249,China;The 11th Oil Production Plant of Changqing Oilfield Company,CNPC,Qingyang,Gansu 745000,China;Slate Key Laboratory of Petroleum Resources and Pros pecting,China Universily of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油长庆油田分公司第十一采油厂,甘肃庆阳745000 [3]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《地质学报》2022年第6期2230-2239,共10页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41472115);中国石油大学(北京)科研启动基金项目(编号2462017YJRC023)资助成果。

摘　　要：鄂尔多斯盆地环西—彭阳地区长8段储层蕴含丰富油气资源,但储层非均质性强,孔隙结构复杂,且受异常低压、黏土矿物附加导电以及高束缚水饱和度影响,油水层分异差,测井响应特征差异不明显,流体性质识别难度大。本文通过岩芯薄片观察、常规测井等资料,对长8段储层四性关系等进行了研究,结果表明长8段岩性主要是中、细砂岩,平均孔隙度14.68%,渗透率7.13×10^(-3)μm^(2)。在此基础上引入视地层水电阻率作为有效参数,建立R_(wa)-AC交会图版,该方法考虑了不同储层物性的差异对储层电性的影响,克服了储层孔隙结构复杂因素的影响,突出了含油气信息,能有效识别不同的流体类型,通过该方法实现了12口井70个层位流体性质测井判别,与试油资料验证良好。研究成果对于长8段储层测井评价和油气勘探开发具有指导意见。The reservoirs in the Chang 8 oil layer to the west of Tianhuan depression-Pengyang in the Ordos basin are rich in oil and gas resources with strong heterogeneity,complex pore structures,and are affected by abnormal low pressure,additional conductivity of clay minerals,and high bound water saturation.The oil-water layer is difficult to distinguish,the difference in logging response characteristics are not obvious,and the identification of fluid properties is difficult.In this paper,the well cores,thin sections,well log results were analyzed to study the four properties of Chang 8 oil layer reservoir from the Triassic Yanchang Formation in the Ordos basin.The results show that the lithology of Chang 8 oil layer is mainly medium and fine sandstone,with physical porosity of 14.68%and permeability of 7.13×10^(-3)μm^(2).On this basis,the apparent water resistivity is introduced as an effective parameter to establish the R_(wa)-AC intersection board.This method takes into account the influence of the differences in physical properties of different reservoirs on the electrical properties of the reservoir,and overcomes the influence of the complex factors of the pore structure of the reservoir.The oil and gas information is highlighted,which can effectively identify different fluid types.By this method,the fluid properties of 70 layers in 12 wells are discriminated by logging,which is well verified with the test data.The research results provide guidance for the logging evaluation and oil and gas exploration and development of the Chang 8 oil layer.

关 键 词：流体性质 测井识别 视地层水电阻率 长8段 环西—彭阳地区 

分 类 号：P618.13[天文地球—矿床学]