沁水盆地榆社—武乡区块二叠系煤系页岩储层地质建模及“甜点”预测  

Geological modeling and“sweet spot”prediction of Permian coal measures shale reservoirs in Yushe-Wuxiang block,Qinshui Basin

作　　者：申有义 王凯峰 唐书恒[3,4] 张松航 郗兆栋[3,4] 杨晓东 SHEN Youyi;WANG Kaifeng;TANG Shuheng;ZHANG Songhang;XI Zhaodong;YANG Xiaodong(Key Laboratory of Monitoring and Protection of Natural Resources in Mining Cities,Ministry of Natural Resources,Jinzhong 030600,Shanxi,China;Coal Geological Geophysical Exploration Surveying&Mapping Institute of Shanxi Province,Jinzhong 030600,Shanxi,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering,Beijing 100083,China)

机构地区：[1]自然资源部矿业城市自然资源调查监测与保护重点实验室,山西晋中030600 [2]山西省煤炭地质物探测绘院有限公司,山西晋中030600 [3]中国地质大学(北京)能源学院,北京100083 [4]非常规天然气能源地质评价与开发工程北京市重点实验室,北京100083

出　　处：《岩性油气藏》2024年第4期98-108,共11页Lithologic Reservoirs

基　　金：NSFC-山西煤基低碳联合基金重点项目“沁水盆地高煤阶煤层气井产能控制因素与增产机理研究”(编号:U1910205);国家自然科学基金面上项目“煤储层润湿性与气水可动性基础研究”(编号:42272197);山西省揭榜招标项目“煤层气、致密气、页岩气“三气”综合开发技术与示范”(编号:20201101003)联合资助。

摘　　要：沁水盆地煤系页岩气资源丰富,但勘探开发处于初期阶段。基于钻井、测井和地震解释资料,结合有机地球化学与储层物性实验测试数据,通过三维地质建模技术,建立了沁水盆地榆社—武乡区块二叠系山西组底部—太原组上部煤系页岩地质模型,并预测了煤系页岩气“甜点”区。研究结果表明:(1)沁水盆地榆社—武乡区块石炭系—二叠系煤系地层模型反映了煤系页岩储层的发育主要受控于构造活动,呈“东浅西深、整体连续”的分布格局。(2)基于序贯指示法建立沉积相模型,指示研究区在太原期—山西期由海陆过渡相转变为近海陆相沉积环境,为稳定优质页岩储层的形成提供了有利的沉积环境。(3)通过相控属性建模实现了储层参数空间分布模拟和精细表征,泥地比、孔隙度、含气量、总有机碳含量和镜质体反射率的平均值分别为0.57,10.02%,1.21 m^(3)/t,2.18%,2.45%,揭示了研究区煤系页岩较好的储集能力、含气性、有机质丰度和资源潜力,脆性指数模型指示出页岩压裂后的有利区带。(4)在精细三维地质建模的基础上,将三维网格单元赋值积分,计算研究区二叠系煤系页岩气地质资源量为1 344.98×10^(8)m^(3),运用层次分析法和模糊评价法预测页岩气“甜点”区,Ⅰ类“甜点”区为地质与工程双重甜点,分布于研究区东北部、中部和西北部局部区域。The coal measures shale gas resources in Basin are abundant,but exploration and develop‐ment are still in the early stages.Based on drilling,well logging,and seismic interpretation data,combined with organic geochemistry and reservoir physical property experimental test data,a three-dimensional geological mode-ling technique was used to establish a geological model of coal measures shale from the bottom of Shanxi Formation to the upper Taiyuan Formation of Permian in Yushe-Wuxiang block,Qinshui Basin,and“sweet spot”areas of coal measures shale gas were predicted.The results show that:(1)The Carboniferous-Permian coal measure strata model for Yushe-Wuxiang block reflects that the development of coal measures shale reservoirs is mainly controlled by tectonic activities,showing a distribution pattern of“shallow in the east and deep in the west,and overall continuous”.(2)The sedimentary model based on sequential indicator method indicate that the transition from marine-continental transitional facies to nearshore continental facies sedimentary environments during Taiyuan to Shanxi period in the study area,providing a conducive sedimentary environment for the formation of stable and high-quality shale reservoirs.(3)Facies-controlled attribute modeling achieved spatial distribution simulation and fine characterization of reservoir parameters.The average values of mudstone ratio,porosity,gas content,total organic carbon content,and vitrinite reflectance are 0.57,10.02%,1.21 m^(3)/t,2.18%and 2.45%,respectively,revealing the favorable reservoir capacity,gas content,organic matter abundance,and resource potential of coal measures shale.The brittleness index model indicates favorable zones after shale fracturing.(4)On the basis of fine three-dimensional geological modeling,the three-dimensional grids were assigned integrals,and the geological resource of Permian coal measures shale gas in the study area is estimated at 18344.98×10^(8) m^(3).Analytical hierarchy process and fuzzy evaluation methods were used to pr

关 键 词：煤系地层 页岩气 地质建模 储层特征 “甜点”预测 地质资源量 二叠系 榆社—武乡区块 沁水盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]