煤层气储层可改造性评价——以郑庄区块为例  

Evaluation of the hydro-fracturing potential for coalbed methane reservoir:A case study of Zhengzhuang CBM field

作　　者：姚艳斌[1,2] 王辉[1,2] 杨延辉[3,4] 刘大锰 鲁秀芹[3,4] 曹路通[1,2] YAO Yanbin;WANG Hui;YANG Yanhui;LIU Dameng;LU Xiuqin;CAO Lutong(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Coal Reservoir Laboratory of National Engineering Research Center of CBM Development&Utilization,Beijing 100083,China;PetroChina Huabei Oilfield Company,Renqiu 062552,China;The CBM Exploration and Development Pilot Test Base of CNPC,PetroChina Company Limited,Renqiu 062552,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]煤层气开发利用国家工程研究中心煤储层物性实验室,北京100083 [3]中国石油华北油田公司,河北任丘062552 [4]中国石油天然气集团公司煤层气开采先导试验基地,河北任丘062552

出　　处：《煤田地质与勘探》2021年第1期119-129,共11页Coal Geology & Exploration

基　　金：国家自然科学基金重点项目(41830427);华北油田股份公司重大专项外协课题(HBYT-YJY-2018-277)。

摘　　要：我国煤层气资源探明率与动用率“双低”,导致煤层气增产显著放缓,已经成为制约我国煤层气产业发展的瓶颈问题。常规煤储层评价较少考虑煤储层的可改造性潜力,导致发现的优质储量偏少,已发现的储量动用率偏低,因此,迫切需要开展煤储层可改造性评价研究。以沁水盆地南部郑庄区块为例,系统开展了岩心与大样物理模拟实验、测井与地震反演分析等;通过对比分析典型井储层地质特征与微地震水力压裂裂缝监测结果,指出影响煤储层可改造性的关键地质因素为煤体结构、宏观煤岩类型、煤层构造变形、煤层地应力、煤层与顶底板的抗拉强度之差,建立了煤储层可改造性综合定量评价模型;并对郑庄区块煤储层可改造性进行了评价分区,其结果得到了区内千余口产气井的验证。研究成果可用于指导尚未动用储量区的煤层气建产和已动用储量区的开发方案优化调整,根据不同区块储层地质特点选择适应性的工程技术与改造方案,以实现地质工程一体化,是我国煤层气“增储上产”的关键。The“double low”rate of exploration and utilization of CBM resources in China leads to a significant slowdown in CBM production,which has become a bottleneck restricting the development of CBM industry in China.The common CBM reservoir evaluation method did not pay enough attention to the hydro-fracturing potential,resulting in low discovery rate of high-quality gas reserves and low mobilization-rate of the present reserves.Thus,it is extremely necessary to do some research regarding to hydro-fracturing potential evaluation.Targeting on the Zhengzhuang CBM field of the southern Qinshui Basin,this study did comprehensive investigations including coal core analysis,physical simulation experiments on large rock samples,geological inversions of well logging and three-dimensional seismic data.Based on the comparison of the geological analysis results with the monitored fracture propagation in hydraulic fracturing,this study concluded five key influence factors for evaluating hydro-fracturing potential of CBM reservoir:i.e.,the coal texture,coal macro-lithotype,coal seam structural deformation,in-situ stress,differences of tensile strength between coal seam and its roof/floor.Based on the analysis of above influence factors,a quantitative comprehensive evaluation model was proposed and applied for evaluating hydro-fracturing potential of the CBM reservoir in the Zhengzhuang field.The evaluation results were validated by the production data of more than 1000 CBM wells.The study is important for predicating production target for the un-mobilized reserve area,and for adjusting or optimizing development plan in the mobilized reserve area.

关 键 词：煤储层 煤层气 可压裂性 储层改造 提高采收率 沁水盆地郑庄区块 

分 类 号：P618.11[天文地球—矿床学]