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黔西红梅井田煤层气有序开发的水文地质条件

DOI: 10.1167/j.issn.1001-8166.2015.04.0456, PP. 456-464

Keywords: 含煤层气系统,水文地质,煤层气开发,灰色关联分析,评价因子

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Abstract:

在多煤层含煤地层中,往往形成垂向上叠置发育的多个独立含煤层气系统,系统之间的相互干扰严重妨碍了煤层气井的有效排水降压。解决这一问题的关键,是查明不同系统之间水文地质条件的差异。基于水文地质勘探成果,分析了黔西织纳煤田红梅井田上二叠统含煤地层不同含煤段的水动力条件和水化学特征,提取视储层压力、压力系数、钻孔单位涌水量、渗透系数、影响半径等与煤层气开发相关的有用信息,发现不同含煤段之间的水文地质条件差异显著,垂向上可能发育与三级地层层序格架相吻合的多层叠置独立含煤层气系统,运用灰色关联分析建立了基于水文地质信息的煤层气开发条件评价因子。在此基础上,评价了不同含煤段的煤层气开发潜力,对煤层气开发顺序进行了概念性设计。研究认为,17~30号煤层段的煤层气开发条件优于其上、下2段,应优先开发,其次是6~16号煤层段;31号煤层至底部开发条件相对较差,应最后开发。

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