贵州页岩气源岩特征及页岩气勘探远景分析

贵州在地质历史时期长期处于海洋沉积环境，特别是缺氧沉积环境发育，形成多层位黑色泥页岩。根据黑色泥页岩分布范围及厚度，主要划分出震旦系陡山沱组、下寒武统牛蹄塘组、奥陶系五峰组、下志留统龙马溪组、中泥盆统罐子窑组-火烘组、下石炭统大塘组、二叠系栖霞组-龙潭组。页岩气烃源岩具有层位多\,厚度大\,有机质含量高，成熟度高等特点。同时，根据页岩气烃源岩分布、厚度、有机质含量、成熟度等综合分析，划分出有利的页岩气成藏区，即武陵褶皱、黔中-黔北、南盘江紫云-册亨页岩气有利发育区，并认为南盘江坳陷的册亨-望谟一带是最有利的页岩气勘探远景区。

Characteristics of Organic-rich Shale and Exploration Area of Shale Gas in Guizhou Province

It presented the marine environment at the long term geological time and formed the multi-sequence organic-rich shale under anaerobic deposition environment in the Guizhou province.Based on distribution and thickness of organic-rich shale,we divide into 7 organic-rich shale sequences,such as Sinian Doushantuo Formation,lower Cambrian Niutitang Formation,upper Ordovician Wufeng Formation,lower Silurian Longmaxi Formation,middle Devonian Guanziyao-Huohong Formation,lower Carboniferous Datang Formation,Permian Xixia-Longtang Formation.The shale gas source rocks in the Guizhou are characterized as multi-sequences,large thickness,high organic carbon content,and high thermal maturity.According to thickness and distribution of source rocks,organic carbon content and thermal maturity,we draw three favorable areas of shale gas exploration,i.e.Wuling fold,central-north Guizhou,and Ziyun-Ceheng of Nanpanjiang.The most favorable area of shale gas exploration in the Guizhou province is the Ceheng-Wangmo area in the Nanpanjiang basin.