沁水盆地武乡地区煤系泥页岩储层特征及勘探建议——以山西武乡地区ZK-42井为例  

Characteristics and Exploration Proposals of Coal Measures Argillutite Reservoir in Wuxiang Area of Qinshui Basin——an Example from ZK-42 Well in Wuxiang,Shanxi Province

作　　者：赵欣[1] 刘杰刚 张尚锟 丁恋 尹亚磊 孙杰 蒋喆 ZHAO Xin;LIU Jiegang;ZHANG Shangkun;DING Lian;YIN Yalei;SUN Jie;JIANG Zhe(Carbon neutral research institute,CNACG,Beijing 100039;College of Eco-environment Engineering,Guizhou Minzu University,Guizhou,550025;PetroChina Coal bed Methane Company Limited,Beijing 100028;General Prospecting Institute,CNACG,Beijing 100039;China University of Mining&Technology(Beijing),Beijing,100083)

机构地区：[1]中国煤炭地质总局碳中和研究院,北京100039 [2]贵州民族大学生态环境工程学院,贵州贵阳550025 [3]中石油煤层气有限责任公司,北京100028 [4]中国煤炭地质总局勘查研究总院,北京100039 [5]中国矿业大学(北京),北京100083

出　　处：《中国煤炭地质》2023年第4期29-36,共8页Coal Geology of China

基　　金：中国煤炭地质总局科技创新项目“碳评价、捕集与封存技术研究”(ZMKJ-2021-ZX02)。

摘　　要：我国沁水盆地发育多套富有机质泥页岩,是煤系气勘探的有利目标层系。以山西武乡地区ZK-42井钻遇泥页岩为研究对象,利用X射线衍射、扫描电镜、总有机碳含量测试、泥页岩含气量测定等测试方法,系统研究了太原组泥页岩的空间展布、矿物组成和储层物性特征,评价了煤系泥页岩勘探潜力。结果表明:(1)矿物组分以黏土矿物和石英为主,黏土矿物质量分数平均为52.8%,主要为伊/蒙混层,石英质量分数平均为26.2%。(2)有机质类型属于Ⅲ型干酪根,具有较强的生气潜力;有机质丰度TOC含量为1.9%~4.8%,平均为2.84%;R_(o)为1.9%~2.9%,平均为2.48%,处于过成熟干气阶段,该区有机质整体成熟度较高。(3)储层物性特征,泥页岩储层孔隙度总体较低,平均为4.34%;渗透率为0.000 123 96~0.009 361 3mD,平均为0.003 935mD;泥页岩实测总含气量较小,为0.35~0.60m^(3)/t,平均为0.47m^(3)/t。(4)本区煤系气勘探建议以太原组15^(#)煤层为主,泥页岩可作为辅助气源补充,采用煤层与泥页岩合层压裂开采方式,进行煤系气资源的综合开发利用。There are many sets of organic-rich argillutite in Qinshui Basin of China,which is a favorable target area for coal-measure gas exploration.Takeing the argillutite of ZK-42 well in Wuxiang,Shanxi Province as the research object,the spatial distribution,mineral composition and reservoir physical properties of argillutite in Taiyuan Formation are studied by means of X-ray diffraction,scanning electron microscope,total organic carbon content test and argillutite gas content determination.The exploration potential evaluation of coal measures argillutite is carried out.The result has shown:①The mineral components are mainly clay minerals and quartz.The average mass fraction of clay minerals is 52.8%,mainly composed of illite/smectite mixed layers,and the average mass fraction of quartz is 26.2%.②The organic matter type belongs to type III kerogen,which has strong gas generation potential;TOC content of organic matter abundance is 1.9%~4.8%,with an average of 2.84%,with a large organic carbon content;R_(o) is 1.9%~2.9%,with an average of 2.48%,which is in the stage of over-mature dry gas.The overall maturity of organic matter in this area is high.③In terms of reservoir physical properties,the porosity of argillutite reservoir is generally low,with an average of 4.34%.The permeability varies widely,ranging from 0.00012396 to 0.0093613mD,with an average of 0.003935mD.The measured total gas content of argillutite is 0.35~0.60m^(3)/t,with an average of 0.47m^(3)/t.④The exploration of coal-measure gas in this area is recommended to focus on the No.15 coal seam of Taiyuan Formation,and argillutite can be used as an auxiliary gas source supplement.Comprehensive development and utilization of unconventional natural gas resources in coal measures are carried out by using the combined fracturing mining method of coal seams and argillutite.

关 键 词：煤系泥页岩 储层特征 勘探建议 沁水盆地 

分 类 号：P618.13[天文地球—矿床学]