岩性油气藏 ›› 2015, Vol. 27 ›› Issue (2): 3845.doi: 10.3969/j.issn.1673-8926.2015.02.007
伊 伟1,熊先钺1,王 伟1,刘 玲2
摘要:
鄂尔多斯盆地合阳地区是我国煤层气勘探的重要区块,在该区进行煤层气赋存特征研究并预测煤层气资源量,对其进一步的开发十分必要。 为此,从地质条件、储层特征(煤层分布、煤层埋藏深度、煤岩特征、煤储层吸附性、煤储层压力、煤储层渗透性及煤层含气性)等方面入手,分析了该区煤层气的赋存特征。结果表明:该区煤层气的保存条件优越;主要含煤地层为二叠系山西组和太原组,含煤层 11 层,可采或局部可采煤层 4 层,煤层累计厚度为 11 m 左右,主力煤层为 5 号煤层,单层厚度超过 3 m;煤质以中—高灰分、低挥发分的贫煤为主,受构造活动破坏的影响较小,煤岩的原生结构较完整,煤储层含气量高且吸附性强。煤层气资源量预测结果表明:该区煤层气主要分布在埋深小于 1 600 m 的范围内,煤层气资源量约为 442.72 亿 m3,其中埋藏深度小于 1 300 m 的煤层气资源量约为 335.01 亿 m3。 由此可见,合阳地区煤层气具有很好的勘探开发前景。
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