中扬子地区泥页岩发育特征与页岩气形成条件分析

中扬子地区在震旦系和古生界发育多套海相暗色页岩,在上三叠统—下侏罗统发育了1套高炭泥质煤系地层,在江汉盆地发育2套古近系陆相暗色泥岩。这些泥页岩厚度大、有机碳含量高、成熟度适宜,与美国产页岩气盆地具有很好的对比性。在前人对中扬子地区的研究基础上,结合页岩气的最新研究成果,探讨中扬子地区泥页岩的发育特征和页岩气形成条件。通过分析,认为中扬子地区具备形成页岩气藏的良好地质条件,尤其是鄂西渝东、湘鄂西区、江汉盆地南部和鄂东南具备优先勘探的条件。

Development characteristics of mud shale and shale gas formation conditions in the middle Yangtze region

Multiple sets of marine dark shale were developed in the Sinian and Paleozoic and one set of coal measure strata was developed in the upper Triassic – lower Jurassic in the middle Yangtze region;and two sets of continental dark shale were developed in the Paleogene in the Jianghan Basin.The shale in these areas possesses large thickness,high content of organic carbon and moderate maturity and they correlate well with the American basins that produce shale gas.Based on the previous research results of the middle Yangtze region and the latest research achievements in shale gas,the paper investigated the development characteristics of mud shale and the shale gas formation conditions in the middle Yangtze region.It is concluded that the middle Yangtze region has favorable geological conditions for the formation of shale gas reservoirs,especially the areas west of Hubei and east of Chongqing,western Hunan and Hubei,southern Jianghan Basin and southeast Hubei are the best candidates for exploration.