中国二叠系海陆交互相页岩气富集成藏特征及前景分析

Enrichment and accumulation characteristics and prospect analysis of the Permian marine conticental multiphase shale gas in China

关键词:  二叠系  海陆交互相  页岩气  富集成藏  资源前景

Key words:  Permian  marine and continental multiphase  shale gas  enrichment and accumulation  resource prospect

摘要:

我国二叠系海陆交互相富有机质泥页岩层系分布广泛，主要有以山西组、太原组和龙潭组为代表的形成于滨浅海环境的含煤建造型和以孤峰组、大隆组为代表的含硅质建造型。本文通过大量页岩气富集评价参数资料对比和综合评价，得出两种层系富有机质页岩具有“有机质含量高、热演化适中、含气量高、孔隙度高”等特点，可与四川盆地已经开发的志留系龙马溪组海相页岩参数相媲美。按照页岩气形成富集成藏“岩相控碳、成岩控烃、构造控藏”的三大主控因素，综合评价和优选了鄂尔多斯盆地东缘、沁水盆地、南华北盆地、开江-梁平裂陷槽、城口-鄂西裂陷槽、皖江裂陷槽及湘中、川南-黔西等页岩气勘查远景区，期待对我国二叠系海陆交互相页岩气勘查开发提供支持。

Abstract:

In China, the marine and continental multiphase shale systems of Permian are widely distributed, mainly including coal bearing formation in the coastal shallow water environment represented by Shanxi formation, Taiyuan Formation and Longtan Formation, and siliceous bearing formation represented by Gufeng formation and Dalong formation. Based on the comparison and comprehensive evaluation of a large number of shale gas enrichment evaluation parameters, two types of organic rich shale that have the characteristics of "high organic matter content, moderate thermal evolution, high gas content and high porosity", which can be compared with the marine shale parameters of Silurian Longmaxi formation in Sichuan Basin are confirmed. According to the three main controlling factors of shale gas enrichment and accumulation, which are lithofacies controlling carbon, diagenesis controlling hydrocarbon and structure controlling reservoir, the shale gas exploration prospect areas such as the eastern margin of Ordos Basin, Qinshui Basin, the north of South China Basin, Kaijiang-Liangping trough, Chengkou-Exi trough, Wanjiang trough, Central Hunan and South Sichuan-Qianxi are comprehensively evaluated and optimized. These shale gas exploration prospect areas will provide support for exploration and development of Permian marine continental multiphase shale gas of China.