【摘要】 中扬子地区页岩气资源潜力巨大,为明确该地区志留系页岩气资源潜力,通过对研究区野外露头观察和实验样品测试,对中扬子地区上奥陶统五峰组-下志留统龙马溪组富有机质泥页岩的沉积特征、厚度展布特征、有机地化特征、储集特征和保存条件进行了研究。分析认为:中扬子地区上奥陶统五峰组-下志留统龙马溪组下部主要是一套硅质岩、硅质页岩、碳质泥页岩为主的沉积,属深水陆棚相,页岩气勘探有利区主要分布在湘鄂西—鄂西渝东地区,志留系富有机质泥页岩厚度20～70 m,有机碳含量1.5%～3.5%,有机质类型主要为II1型,镜质体反射率2.6%～4.8%,孔隙度1.23%～1.84%,硅质含量47%～85.46%,微裂缝较发育,具备良好的页岩气成藏条件。更多还原

【Abstract】 The shale gas resource in Middle Yangtze area is abundant. Based on the observing outcrop, sample testing, drilling data review of depleted wells and core analysis of new wells, choose the combination of comprehensive study and the field geological survey, the research has been conducted on sedimentary, thickness distribution, organic geochemistry, reservoir and preservation characteristics of the rich organic matter mud shale of the Upper Ordovician Wufeng Formation-Lower Silurian series Long maxi Formation in middle Yangtze area, the analysis suggests that the lower of Upper Ordovician Wufeng Formation-Lower Silurian series Longmaxi Formation in Middle Yangtze area has a set of deposits mainly in siliceous rock, siliceous shale and carbon mud shale, it represents transgressive systems tract, belongs deep water shelf, the favorable shale gas exploration area is mainly distributed in western Hubei and Hunan-western hubei and eastern Chongqing area, 20 ～70 m of rich organic matter mud shale thickness, 1.5%～3.5% of organic carbon content, type II1 of organic matter type, 2.6%～4.8% of vitrinite reflectance, 1.23%～1.84% of porosity, 47%～85.46% of siliceous content, with developed microfracture, it has good shale accumulation condition.更多还原