川东地区上二叠统龙潭组页岩气勘探潜力

doi:10.11743/ogg20150317

摘要/Abstract

摘要：

根据前人资料，并结合野外地质调查和钻井资料分析研究表明，川东地区上二叠统龙潭组富有机质泥页岩厚度均大于50 m，最厚可达140 m。岩性组合纵横向变化较大：北部云阳-通江一带以泥质岩为主夹灰岩，中部区广安一带为泥页岩夹煤层和灰岩，南部区为泥页岩夹砂岩及煤层。泥页岩有机质丰度一般大于2%;泥页岩干酪根碳同位素及有机岩石学研究表明，有机质类型主体以Ⅱ型为主，生烃潜力优越。泥页岩X-衍射、镜质体反射率分析揭示出石英等脆性矿物含量高，演化程度高，具较好的可压裂性。钻进过程中龙潭组泥页岩气测异常明显，反映了良好的含气性。页岩气资源预测表明具有良好的页岩气资源潜力和勘探前景。综合分析认为，北部万县—仪陇—通江—奉节一带以及南部宜宾—永川—綦江—赤水一带具有较好的页岩气勘探前景。

关键词: 页岩气, 勘探潜力, 龙潭组, 川东地区

Abstract:

Based on the previous studies and in combination with field geological investigation and drilling data analysis, the research indicates that the thickness of the organic rich shale in the Upper Permian Longtan Formation in the eastern Sichuan Basin is generally over 50 m with the maximum thickness of 140 m.Lithological association varies significantly in both vertical and horizontal direction:there mainly developed shale with limestone interbed in the Yunyang-Tongjiang area in the north, shale with coal seam and limestone interbeds in the Guang'an area in the central, as well as shale with sandstone and coal seam interbeds in the south.The total organic carbon contents(TOC)are generally higher than 2%;Research on carbon isotopic composition of the shale kerogen and the organic petrology indicates that the organic matters are mainly of type Ⅱ with excellent hydrocarbon generation potential.Analysis of X-ray diffraction and vitrinite reflectance indicates that the shale has a high content of brittle minerals such as quartz and displays a high evolution degree with favorable fracturability.The gas logging during drilling inthe Longtan Formation shale displays significant abnormity, reflecting the favorable gas potential.The prediction of shale gas resource suggests largeresource potential and exploration prospect for shale gas.A comprehensive analysis indicates that there have favorable exploration prospect for shale gas in Wanxian-Yilong-Tongjiang-Fengjie area in the north and the Yibin and Yongchuan-Xijiang-Chishui area in the south.

Key words: shale gas, exploration potential, Longtan Formation, eastern Sichuan Basin

中图分类号:

TE122.1

刘光祥,金之钧,邓模,等. 川东地区上二叠统龙潭组页岩气勘探潜力[J]. 石油与天然气地质, 2015, 36(3): 481-487. doi: 10.11743/ogg20150317 Liu Guangxiang,Jin Zhijun,Deng Mo,et al. Exploration potential for shale gas in the Upper Permian Longtan Formation in eastern Sichuan Basin[J]. Oil & Gas Geology, 2015, 36(3): 481-487. doi: 10.11743/ogg20150317

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