油基与水基泥浆环境下白云岩储层测井响应差异性研究——以川中古隆起灯影组为例  

Study on the differences in logging responses of dolomite reservoirs in oil-based and water-based mud environments:a case study of the Dengying Formation in the central Sichuan paleo-uplift

作　　者：罗洋[1] 刘岩[1] 王亮 张宇 王琼[3] LUO Yang;LIU Yan;WANG Liang;ZHANG Yu;WANG Qiong(College of Energy,Chengdu University of Technology,Chengdu 610059,China;Exploration Business Department of PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China;College of Electrical Engineering and Information,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]成都理工大学能源学院,成都610059 [2]中国石油西南油气田公司勘探事业部,成都610041 [3]西南石油大学电气信息学院,成都610500

出　　处：《地球物理学进展》2024年第2期737-748,共12页Progress in Geophysics

基　　金：国家自然科学基金项目(U2003102,41974117);国家科技重大专项(2016ZX05052001)联合资助。

摘　　要：川中古隆起蓬莱气区灯影组属超深地层.为适应超深地层高温高压环境、提高钻井速度,部分井采用油基泥浆钻井,因此,明确油基与水基泥浆环境下的测井响应差异对于储层测井评价十分重要.为此,本文选择两口井(A井和B井)开展水基泥浆替换油基泥浆实验,并结合岩心及试气资料,明确了油基泥浆和水基泥浆测量环境条件下常规测井和电成像测井响应特征差异.分析结果表明:(1)油基泥浆条件下,扩径段自然伽马、声波时差和补偿中子测井曲线值不受泥浆性质影响;补偿密度测井曲线值略低,且在扩径明显处差异大;未扩径段补偿密度测井曲线值不受泥浆环境影响;(2)油基泥浆条件下阵列感应测井电阻率对水层敏感,在水层处存在负差异现象;(3)水基与油基泥浆条件下双侧向测井电阻率明显高于阵列感应测井电阻率;(4)油基泥浆成像测井可展现与水基泥浆成像测井同等地层信息,不易识别井眼崩落和应力释放缝.结论认为,油基泥浆环境下,扩径段需对补偿密度曲线值进行校正,成像测井可准确识别地质特征,并用于储层评价.The Dengying Formation in the Penglai gas field of the central Sichuan paleo-uplift is an ultra-deep stratum.some wells use oil-based mud drilling to adapt to the high-temperature and high-pressure environment and increase drilling speed.Therefore,it is important to clarify the differences in logging responses between oil-based and water-based mud environments for reservoir logging evaluation.In this study,two wells(well A and well B)were selected to conduct experiments replacing oil-based mud with water-based mud.Combined with core and gas test data,the differences in logging response characteristics under oil-based and water-based mud measurement conditions were clarified for conventional logging and electric imaging logging.The analysis results showed that:(1)Under the condition of oil-based mud,the values of the natural gamma curve,acoustic logging curves and compensated neuron logging curve at the expanded section are not affected by the mud properties;the compensated density logging curve values are slightly lower,and the differences are greater at the expanded section;the values of the compensated neuron curve at the unexpanded section are not affected by the mud environment;(2)Under the condition of oil-based mud,the resistivity logging of the array induction logging is sensitive to the water layer,and there is a negative difference phenomenon in the water layer;(3)Under the conditions of water-based and oil-based mud,the resistivity logging of the dual laterolog is significantly higher than the resistivity logging of the array induction logging;(4)Oil-based mud imaging logging can display the same formation information as water-based mud imaging logging,and it is not easy to identify borehole collapse and stress relief fractures.The conclusion is that in the oil-based mud environment,the compensated density curve values need to be corrected at the expanded section,and imaging logging in the oil-based mud environment can accurately identify geological features and be used for reservoir evaluation.

关 键 词：泥浆环境差异 油基泥浆 阵列感应测井 双侧向测井 

分 类 号：P631[天文地球—地质矿产勘探]