川中蓬莱气区下寒武统沧浪铺组混积岩储层测井评价  

Logging Evaluation of Mixed-sediments Reservoirs of the Lower Cambrian Canglangpu Formation in Penglai Gas Area,Central Sichuan Basin

作　　者：王海青 汪泽宇 赖强[2] 李淑荣 吴煜宇 张明勇 王雅情 WANG Haiqing;WANG Zeyu;LAI Qiang;LI Shurong;WU Yuyu;ZHANG Mingyong;WANG Yaqing(Shandong Leading Petro-Tech CO.LTD.,Dongying,Shandong 257100,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610041,China)

机构地区：[1]山东立鼎石油科技有限公司,山东东营257100 [2]中国石油西南油气田分公司勘探开发研究院,四川成都610041

出　　处：《测井技术》2024年第5期670-682,共13页Well Logging Technology

基　　金：西南油气田分公司科技(研发)计划项目“蓬莱气田寒武系沧浪铺组、龙王庙组储层测井评价关键技术研究”(20230301-12)。

摘　　要：川中古隆起北斜坡蓬莱气区下寒武统沧浪铺组为近几年获得油气勘探突破的新层系。沧一段碳酸盐岩沉积物和硅质碎屑在纵向上呈互层或在平面上交叉沉积,岩石类型多样,准确计算多种矿物含量难度大。混积岩储层评价以准确计算矿物组分、物性参数和评价储层有效性为主,整体来看,孔渗关系规律性差,含气丰度在电性上分异特征模糊,传统的参数计算模型不适用,亟需研究形成有效的测井评价方法。利用铸体薄片、全岩分析、物性等岩心分析数据和测录井、试气资料,形成一套系统评价方法:应用降维法、神经网络法、元素反演法计算矿物组分;基于三孔隙度测井变骨架参数计算孔隙度;利用岩性细分模式计算渗透率,利用阵列声波结合电成像测井定量评价储层储集性、连通性和渗透性,确定了有效储层下限和储层分类标准。研究表明,降维法等方法解决了4种以上混积矿物组分及含量计算问题,计算结果与岩性扫描测井具有高度一致性;变骨架参数计算孔隙度和岩性细分模式计算渗透率与岩心分析吻合程度高;电成像结合声波远探测、声速层析成像判断孔隙空间类型特征及储层有效性应用效果较好。综合各项技术可以有效完成对沧浪铺组混积岩的储层测井评价。The Canglangpu formation of Lower Cambrian,Penglai gas area,north slope of central Sichuan paleo-uplift is a new formation which has achieved breakthrough in oil and gas exploration in recent years.In the first member of Canglangpu formation,carbonate sediments and siliciclastic detritus present the depositional pattern of vertical alternation or horizontal succession,it is difficult to accurately calculate the contents of various minerals because of the variety of rock types.The evaluation of mixed-sediments reservoirs is mainly based on the accurate calculation of mineral composition,physical parameters and the evaluation of reservoir effectiveness.From an overall perspective,the regularity of porosity to permeability is poor,the electrical differentiation of gas abundance is fuzzy,so the traditional parameter calculation model is not applicable,and it is urgent to study an effective logging evaluation method.Using the core analysis data such as cast thin section,XRD,physical property,logging data and gas testing data,the paper studied a systematic evaluation method for calculating the mineral component by dimensionality reduction,neural network analysis and element content to mineral content inversion method,calculating porosity by variable matrix parameters on the basis of tri-porosity logging curves,calculating permeability by lithologic subdivision model,and quantitative evaluation of reservoir property,connectivity and permeability by array acoustic wave combined with electrical imaging logging,then determined the lower limit of effective reservoir and the classification standard of reservoir.Results show that,the dimensionality reduction method and other methods have solved the problem of calculating the composition and content of more than four kinds of minerals,and the calculation results are highly consistent with the Litho Scanner logging data,the porosity calculated by variable matrix parameters on the basis of tri-porosity logging curves and the permeability calculated by subdivision model are in go

关 键 词：混积型碳酸盐岩 复杂矿物组分 变骨架参数 孔隙度谱 声速层析成像 

分 类 号：P631.84[天文地球—地质矿产勘探]