Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas
Mou Chuanlong1, 2, Wang Xiuping1, 2, Wang Qiyu1, 2, Zhou Kenken1, 2, Liang Wei1, 2, Ge Xiangying1, 2, Chen Xiaowei1, 2
1 Chengdu Center,China Geological Survey,Chengdu 610081,Sichuan; 2 Key Laboratory of Sedimentary Basin and Oil and Gas Resources,Ministry of Land and Resources,Chengdu 610081,Sichuan
Abstract：On the basis of detailed study of sedimentary facies of the Lower Longmaxi Formation of Silurian in southern Sichuan Basin and its adjacent areas,combining with the results of experimental methods such as polarizing microscope,X-ray diffraction and element geochemistry,the relationship between sedimentary facies and shale gas geological conditions were studied. Tidal flat and shallow shelf facies are the two main sedimentary facies in the study area. The lower section of the Longmaxi Formation is rich in organic matters and siliceous shales,which were conducive to the enrichment and development of shale gas. The formation of siliceous shale riched in organic matter of the lower member of Longmaxi Formation was due to the anoxic retention environment,layered water caused by a rapid transgression,appropriate deposition rate and relative high biological yield. The tidal flat deposits are unfavourable for shale gas formation. Deep-water shelf facies in the depocenter are dominated by carbonaceous siliceous shale,carbonaceous shale and calcium carbonaceous silty shale,which are favorable for shale gas formation. Sandy and muddy shallow shelf is the secondary favorable area for shale gas development containing more organic matters;marlite and muddy shallow shelf is composed mainly of “calcareous mudstone and carbonaceous argillaceous limestone”,which are not favorable for shale gas formation with relative low organic matter content.
Mou Chuanlong,Wang Xiuping,Wang Qiyu et al. Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas[J]. JOPC, 2016, 18(3): 457-472.
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