鄂西鹤峰地区上二叠统大隆组页岩储层特征及资源潜力

在野外地质调查基础上,通过有机地化测试、物性研究和扫描电镜等方法,对鄂西鹤峰地区泥页岩储层及资源潜力进行了研究。结果表明:(1)鹤峰地区大隆组形成于台盆相,岩性以硅质页岩、炭质页岩为主,厚度为47.5~53.9 m。(2)目的层泥页岩具有“有机质丰度高、热演化程度高”等特征,TOC含量平均为6.03%,Ro平均为2.40%,脆性矿物含量平均为81.0%。(3)岩石中吸附气含量较高,质量体积平均为2.08 m^3/t,埋深小于2000 m,具有良好的勘探前景。(4)采用叠合法预测出鹤峰茅坪-石灰窑和鹤峰太平-咸盈一带为页岩气勘探有利区,用概率体积法估算页岩气地质资源量(P50)分别约为303.56×108 m^3和533.33×108 m^3。该研究成果可为鄂西鹤峰地区大隆组页岩气勘探提供借鉴。

Characteristics of Shale Reservoir and Resource Potential Evaluation in the Upper Permian Dalong Formation of Hefeng area in Western of Hubei Province

On the basis of field geological investigation, the shale reservoir and resource potential in Hefeng area of Western Hubei Province have been studied by means of organic geochemistry, physical properties and scanning electron microscope. Results shows that:(1) the Dalong Formation in Hefeng area is formed in platform basin facies, and the lithology is mainly siliceous shale and carbonaceous shale, with a thickness of 47.5~ 53.9 m.(2) the target shale is characterized by high organic matter abundance and high thermal evolution.The average TOC(total carbon content) content is 6.03%, Ro content is 2.40%, and the average brittle mineral content is 81.0%.(3) the content of adsorbed gas in the rock is high, the average mass volume is 2.08 m3/t,and the buried depth is less than 2000 m, so it has a good exploration prospect.(4) it is predicted that the Maoping–Shihuiyao area in Hefeng County and Taiping-Xianying area in Hefeng County are favorable areas for shale gas exploration by superposition method, and the estimated geological resources of shale gas(P50) are about 303.56×108 m^3 and 533.33×108 m^3 respectively. The research results can be used for reference for shale gas exploration of Dalong Formation in Hefeng area, Western Hubei Province.