湖北西部上二叠统大隆组页岩气资源潜力评价

Evaluation of shale gas resource potential of Late Permian Dalong Formation in western Hubei province

湖北宜昌秭归地区寒武系及前寒武系页岩气的勘探突破,显示出湖北西部地区良好的页岩气勘探前景。湖北西部地区是目前湖北省页岩气勘探开发的重点区域,也是最有可能实现页岩气商业性突破的地区。通过野外剖面测量与对比、老井复查、泥页岩样品的地球化学和含气性分析认为:湖北西部建始—鹤峰地区上二叠统大隆组主要发育台盆沉积环境,沉积的黑色页岩有效厚度达30 m左右,且成烃物质基础良好;大隆组页岩气钻井现场解析气质量体积均超过2 m^3/t,泥页岩样品等温吸附实验模拟测定的页岩气质量体积均值达2.58 m^3/t,显示出良好的页岩气勘探前景。湖北西部二叠系大隆组是湖北省最有可能成为继秭归地区寒武系及前寒武系页岩气勘探示范区之后又一页岩气勘探示范区,有望揭开湖北省页岩气勘探开发的新局面。

The exploration breakthrough of Cambrian and Precambrian shale gas in Zigui area,Yichang,Hubei province,shows favorable exploration prospects for shale gas in western Hubei province. The western region of Hubei province is the key area for shale gas exploration and development and is also the most likely area to achieve a commercial breakthrough of shale gas. Field profile survey and correlation,old well reexamination,geochemical and gas-bearing property analysis of shale samples were carried out. It is considered that it was mainly basin sedimentary environment in the Late Permian Dalong Formation in Jianshi-Hefeng area. The effective thickness of the deposited black shale is about 30 m,and the hydrocarbon generation material basis is fine. The shale gasmass volume of Dalong Formation is more than 2 m^3/t,and the average shale gas mass volume of the shale samples measured by isothermal adsorption experiment reaches 2.58 m^3/t. showing favorable prospects of shale gas exploration. The Permian Dalong Formation in western Hubei is most likely to be a new demonstration area for shale gas exploration in Hubei province since the demonstration area of Cambrian and Precambrian in Zigui region,which is expected to open up a new situation of shale gas exploration and development in Hubei province.