Reservoir Accumulation Model at the Edge of Palaeohigh and Significant Discovery of Shale Gas in Yichang Area, Hubei Province
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摘要: 在对四川盆地内威远古隆起、盆外雪峰古隆起和汉南古隆起等构造研究的基础上,创新提出"古老隆起边缘控藏模式"页岩气成藏模式,古老隆起边缘控藏模式认为古隆起周缘具有埋藏深度适中、抬升较早、构造变形较弱的特点,有利于页岩气的富集和保存,以此为指导,通过部署页岩气基础地质调查和二维地震勘探,优选了鄂西长阳页岩气有利区,通过实施鄂阳页1井,获得寒武系天河板组、牛蹄塘组和震旦系灯影组、陡山沱组页岩气与天然气"四层楼"式重大发现.开辟了南方古老层系页岩气勘查新领域.Abstract: Based on the research on paleo-uplift of Weiyuan in Sichuan Basin, extrabasinal Xuefeng paleo-uplift and Hannan paleo-uplift, "the ancient uplift margin controlling reservoir model for shale gas accumulation mode" was innovatedly put forward. The ancient uplift margin has the characteristics that the buried depth is moderate around the magin with early uplift and weak tectonic deformation. All the information is conducive to the enrichment and preservation of shale gas. Under this guide theory and through the shale gas geological survey and 2D seismic exploration, preferably favorable areas of shale gas in Changyang in the west of Hubei Province were delineated. Through the drilling of Eyangye 1 well, "four floors" great discoveries of Tianheban Formation, Cambrian Niutitang Formation, Sinian Doushantuo Formation and Dengying Formation shale gas and natural gas were achieved, and this opens up a new field of shale gas exploration in South China.
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