古地理学报2016，Vol.18Issue(3)：457-472,16.DOI:10.7605/gdlxb.2016.03.032
川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系
Relationship between sedimentary facies and shale gas geological conditions of the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its adjacent areas
摘要
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 be-tween sedimentary facies and shale gas geological conditions were studied.Tidal flat and shallow shelf faci- <br> es 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 For-mation was due to the anoxic retention environment,layered water caused by a rapid transgression,appro-priate 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,carbo-naceous 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.关键词
岩石类型/沉积相/页岩气/龙马溪组/下志留统/川南及邻区Key words
rock type/sedimentary facies/shale gas/Longmaxi Formation/Lower Silurian/south-ern Sichuan Basin and its adjacent area分类
天文与地球科学引用本文复制引用
牟传龙,王秀平,王启宇,周恳恳,梁薇,葛祥英,陈小炜..川南及邻区下志留统龙马溪组下段沉积相与页岩气地质条件的关系[J].古地理学报,2016,18(3):457-472,16.基金项目
中国地质调查局地质调查项目（编号12120115004301）与国家自然科学基金项目（编号41302093）共同资助。@@@@［Co-funded by the Geological Survey Project of China Geological Survey （No.12120115004301） and the National Natural Science Foundation of China （No.41302093）］ （）
