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
赵欣,刘杰刚,张尚锟,丁恋,尹亚磊,孙杰,蒋喆
摘要(Abstract):
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。
关键词(KeyWords): 煤系泥页岩;储层特征;勘探建议;沁水盆地
基金项目(Foundation): 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)
作者(Author): 赵欣,刘杰刚,张尚锟,丁恋,尹亚磊,孙杰,蒋喆
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