扬子区页岩气和煤层气联合开发的地质优选

Geological optimization of shale gas and coalbed methane combined research & develop in Yangtze,China

为了优选煤层气和页岩气联合研究与开发的有利区域,以扬子地区二叠系龙潭组及其上下部组合地层为研究对象,分析页岩气和煤层气的资源分布特点;讨论成藏地质条件及气藏聚集模式,依据龙潭组及其上下部地层组合的分布特征和埋深、页岩气和煤层气的资源潜力等条件,确定优选区域。研究认为,龙潭组在上扬子和下扬子普遍发育;上扬子滇东-黔西等区煤层气资源丰富;上扬子龙潭组及其与局部由长兴组相变而成的大隆组组合,下扬子大隆组—龙潭组—孤峰组组合均发育富含有机质泥页岩,厚度较大、分布连续,有机质含量高,母质类型好,成熟度高,具有页岩气成藏的良好地质条件和丰富的资源潜力,且存在页岩气和煤层气资源的重叠组合性;至少在上、下扬子分别形成三种和两种地层空间气藏聚集模式。上扬子川南资阳、自贡及重庆、黔西北地区和下扬子苏南句容盆地,可作为开展页岩气和煤层气联合研究与开发的优选区域。

The Upper Permian Longtan Formation and the combined upper and lower strata in Yangtze,South of China are as the research objects for the basis of bringing forward the suggestion of combined research develop in the article.It analyzed the distributed features of the resources of the shale gas and the CBM.It discussed the geological conditions of accumulation and the gather mode of the gas pool,and then optimized Yangtze as the favorable region to launch combined research develop of the shale gas and the coalbed methane.The result showed that Longtan Formation is general developed in upper and in lower Yangtze.The CBM resource in Eastern Yunnan and Western Guizhou is very rich.Longtan Formation on the Yangtze region and the Dalong combination which local phase transformed from Changxing Formation,Dalong-Longtan-Gufeng combinations on lower Yangtze grow clay shale,which is rich in the organic matter.The clay shale has a larger thickness and continuous distribution.The type of parent material is good,and its maturity is high.These make it has appropriate geological conditions to form shale gas and rich resource potential.It has the overlapping and combination of the shale gas and CBM resources.In the area,it at least respectively forms three kinds and two kinds of the aggregation model of gas reservoir formation.It is determined that Ziyang and Zigong in southern Sichuan,Chongqing,northwest Guizhou on upper Yangtze and Jurong Basin in southern Jiangsu on lower Yangtze are the optimization regions to launch shale gas and CBM combined research development.