中上扬子地区下古生界页岩气资源前景分析

Perspectives of the Lower Palaeozoic shale gas resources in the middle-upper Yangtze area

我国中上扬子地区下古生界黑色页岩是震旦系、二叠系大中型气田的重要烃源岩,同时其自身也具有形成页岩气藏的巨大潜力。初步研究表明,中上扬子地区下古生界有利页岩气层主要发育在下震旦统陡山沱组、下寒武统筇竹寺组、上奥陶统五峰组和下志留统龙马溪组,这些层位的黑色页岩厚度、有机碳含量、以及Ro值等各项参数均符合形成页岩气藏的特征,是今后页岩气勘探的潜力地层。

The Lower Palaeozoic black shales in the middle-upper Yangtze area have proven to be important source rocks of the Sinian to the Permian large-to medium-sized gas fields,and also are of great potential in the accumulation of shale gas.The results of the preliminary study show that the favourable shale gas horizons are mainly developed in the Lower Sinian Doushantuo Formation,Lower Cambrian Qiongzhusi Formation,Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation.All these strata may be potential stratigraphic horizons for the future exploration of the shale gas due to favourable thickness of black shales,organic carbon contents and Ro values.