煤层气“甜点”测井判别与产量预测——以沁水盆地柿庄南区块为例  

Sweet Spot Identification with Well-Logging Data and Production Prediction for Coalbed Methane:A Case Study from Southern Shizhuang Block in Qinshui Basin

作　　者：余杰 秦瑞宝 梁建设 孙建孟 魏晓晗 黄涛 YU Jie;QIN Ruibao;LIANG Jianshe;SUN Jianmeng;WEI Xiaohan;HUANG Tao(Research Institute, CNOOC, Beijing 100028, China;School of Geosciences, China University of Petroleum,Qindao, Shandong 266580, China)

机构地区：[1]中海油研究总院,北京100028 [2]中国石油大学地球科学与技术学院,山东青岛266580

出　　处：《新疆石油地质》2017年第4期482-487,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05025-001)

摘　　要：针对煤层气"甜点"判别与产量预测难的问题,提出了一种利用常规测井曲线评价煤层气"甜点"和产量预测的方法。以沁水盆地柿庄南区块3号煤层为研究对象,从煤层气单井平均日产气量入手,探讨不同单井平均日产气量煤层的敏感测井响应特征,利用井径、自然电位、自然伽马、深侧向电阻率和密度测井曲线,计算煤体结构指数、产能指数、含气量、含气饱和度、临界解吸压力及顶底板特性等煤层关键参数。综合煤体结构指数与产能指数构建了煤层品质参数,结合含气量、临界解吸压力与顶底板特性建立了柿庄南区块煤层气"甜点"测井判别标准;并利用煤层含气量、含气饱和度与产量刻度系数预测产气量,应用该方法处理解释研究区97口煤层气井,预测准确率达84%.The paper introduces a method to solve the problems in sweet spot identification and production prediction in coalbed methane wells by using conventional well logging data.Taking No.3coal seam in southern Shizhuang block of Qinshui basin as an example and starting from the average daily gas production in individual CBM wells,the paper discusses the logging response characteristics of the coal seam and calculates the key parameters of the coal seam such as coal texture index,productivity index,gas content,gas saturation,critical desorption pressure and coal roof&floor features by using caliper,natural potential,gamma?ray,deep lateral resistivity and density logging curves.The paper establishes a composite coal?seam quality parameter by using coal texture index and productivity index,builds up criteria to identify CBM sweet spot with logging data by integrating the composite quality parameter,gas content,critical desorption pressure and coal roof&floor features,and predicts CBM production by using gas content and gas saturation in coal seams,and production scale coefficient.The application results from97CBM wells in the study area show that the accuracy rate of the prediction method can reach84%.

关 键 词：沁水盆地 柿庄南区块 煤层关键参数 测井评价 甜点判别 产量预测 

分 类 号：TE16[石油与天然气工程—油气勘探]