四川地区志留系页岩气成藏的地质背景

The geologic background of the Siluric shale-gas reservoiring in Szechwan,China

从构造演化入手,以四川地区志留系龙马溪组底部的黑色泥岩为研究对象,探讨其页岩空间分布特征、生烃作用历程及页岩气的成藏过程。研究认为:四川地区龙马溪组黑色页岩是一套富含有机质的烃源岩,属Ⅰ型干酪根,具有厚度大、埋藏适中、有机质成熟度高等有利条件,为页岩气在该地区的形成和聚集成藏,并形成大规模的气藏提供可能;威远、泸州、宜宾和自贡区域龙马溪组页岩气资源潜力很大。

Based on tectonic evolution,took black mudstone in the bottom of Longmaxi formation as study object to research the spatial distribution characteristics,hydrocarbon generating process and accumulation process of shale.The results show that Longmaxi formation black shale is a hydrocarbon source rock rich in organic matter and kerogen type is Ⅰ,with large thickness and buried moderate,high organic matter maturity favorable conditions’for the shale gas formation in the region and aggregation into a reservoir,and makes the formation of large-scale gas reservoir as possible.The study also suggests that Longmaxi shale gas resource potential is great in Weiyuan,Luzhou,Yibin and Zigong region in Sichuan Basin.