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OALib Journal期刊
ISSN: 2333-9721
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深部煤层气成藏条件特殊性及其临界深度探讨
Keywords: 深煤层,煤层气,成藏条件,临界深度,沁水盆地
Abstract:
？深煤层概念及其评价指标的科学界定，是推动深部煤层气基础理论研究的基础。基于对地应力、含气性、储层物性及岩石力学性质等随煤层埋深变化特征的分析结果显示:相对浅部，深部煤孔隙结构变化小，中孔—微孔比例趋于均一；煤层含气量与埋深之间存在一个“临界深度”，超过此埋深之后含气量随埋深进一步增大而趋于降低；渗透率的常用对数与埋深呈线性负相关关系，暗示深部煤储层趋于致密化；深部围压正效应和温度负效应强弱相互转换，煤岩弹性模量随着埋深增加存在“拐点”。构建了基于地应力、饱和含气量、渗透率等深煤层界定指标体系。以沁水盆地为例，将该盆地深煤层界定在750m以深。即在此深度以深，煤层气成藏特征开始发生转换，其开发须针对储层特性变化采取相应的措施。
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