天然气地球科学 ›› 2022, Vol. 33 ›› Issue (5): 799806.doi: 10.11764/j.issn.1672-1926.2021.10.017
Wei GAO1,2,3(),Tongsheng YI1,2(),Zhihua YAN1,Jun JIN1,2
摘要:
基于近年来的勘探认识,阐述了贵州省煤系气主要发育层系的基本特征,研究了主要层系的煤系气成藏地质条件,分析了不同层系的煤系气勘探潜力。结果表明:二叠系龙潭组和石炭系旧司组是贵州煤系气勘探研究的主要层系。龙潭组广泛发育薄至中厚煤层群,煤阶较高,煤层含气性远高于非煤层,烃源岩空间展布不稳定;不同岩性储层物性差异显著,三角洲相砂岩和泥页岩脆性较弱,潮坪—潟湖相砂岩和泥页岩具有较好脆性;垂向叠置含气系统发育,有利区段优选及合层改造难度较大,合采兼容性问题突出。龙潭组主要发育“源储一体型”独立煤层气藏、“源储紧邻型”煤系气(煤层气+煤系页岩气+煤系致密砂岩气)组合气藏2种主要类型,2种次要气藏类型为“源储一体型”煤系“两气”(煤层气+煤系页岩气)组合气藏、“下生上储型”煤系“两气”(煤层气+煤系致密砂岩气)组合气藏。旧司组发育以页岩为主、薄煤层交互且沉积厚度较大的中等富气储层,各类储集层含气性和脆性中等,均质性相对较好,有利于合层改造,主要发育“源储一体型”独立煤系页岩气藏和“源储一体型”煤系“两气”(煤系页岩气+煤层气)组合气藏2类气藏类型。
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