School of Energy Resources, China University of Geosciences Hunan Institute Geological Survey Tuha Oilfield
Company, Petro China Company Limited

为了研究湘西北地区下志留统龙马溪组页岩气成藏条件,优选有利区,从有机地化特征、孔裂隙特征等方面对页岩样品进行了测试分析。结果表明:该地区龙马溪组页岩平均厚24 m;有机碳含量(TOC)为0.7%~1.5%;干酪根类型为Ⅰ型,镜质组反射率Ro为1.06%~3.95%,平均值为1.99%,处于成熟-过成熟阶段;孔裂隙发育,孔隙度平均为5.6%。总体认为,湘西北龙马溪组黑色页岩具备页岩气勘探开发的良好条件,有利区位于张家界—桑植—永顺一带。

In order to analyze shale gas reservoir forming conditions of lower silurian series from longmaxi formation in northwestern of Hunan province and find fa vorable areas, the authors tested the features of shale gas from the following aspects, the organic geochemical characteristics, the pore-fracture developing features.T he results showed that the average thickness of the shale of lower silurian series longmaxi formation was 24 meters and the content of total organic carbon (TOC) was between 0.7% ~ 1.5% overall.The kerogen type was I type and the vitrinite reflectance (Ro) was 1.06% ~3.95% and the average value was 1.99%, which indicated the shale gas was at the stages of mature and post mature.The pore-fracture system was well developed and the average porosity was 5.6%.Overall, the black shale of low er silurian series longmaxi formation in northwestern Hunan Province had ideal exploration and development conditions and the favorable area was located in Zhangjaiji e- Sangzhi- _Yongshun district.

国家自然科学基金资助项目(41272176)；高校博士点基金资助项目(20110022110007)；