Study On The Characteristics Of The Main Marine-continental Facies Mud-shale Reservoir Of Basin In China

At present,domestic and international marine shale gas research have great progress,marine shale gas rich integrated reservoir model is established,in southern China has complex structures,marine shale evolution degree higher characteristic.This characteristic,the establishment of the marine shale gas "deep water shelf facies is the foundation,good preservation condition is key of binary enrichment pattern.To establish a " ladder migration,sink anticline,fault slip fracture control,box shaped accumulation of accumulation mode,for China's marine shale gas exploration and development provides a theoretical basis,southern marine mud shale exploration degree is higher,resource potential is enormous,in North China,land and sea in the western region cross each other and terrestrial mud shale stratum exploration degree relatively low,but its huge conventional oil and gas resources indicates that non conventional resources in this area can not be ignored.Paralic organic rich shale can be further divided into shale and shale and coal of two types.Shale rich organic shale mainly interbedded with other detrital rocks constitute a shale gas layer,mainly in the Dian Qian GUI area Permian Liangshan formation and Pingle depression depression in Lower Permian system in Xiaojiang River side groups,such as.Shale and coal type: shale and coal seam type and other clastic rock,carbonate rock constitute a shale gas layer,mainly in the southern region Longtan group,the north area of Taiyuan Formation and Shanxi formation.By referring to a large number of domestic and foreign related shale gas research data,summed up the focus of China's land and sea interaction shale gas formation of the geological background,geological conditions,development model,comparison of the North China area south of North China Basin,Qinshui Basin,Ordos Basin of Shanxi Formation and Taiyuan Formation,and southern Sichuan Basin,Western Hunan area of Longtan Formation of mud shale reservoir set features,integrate through the data comparison,for China Sea Land alternation facies shale gas exploration and evaluation to provide a reliable basis.Through the comparison of the Ordos Basin,Qinshui Basin and the southern North China Basin of Taiyuan Formation and Shanxi formation,and Sichuan Basin,Western Hunan area of Longtan Formation of mud shale reservoir layer the geological conditions can be found: II-type III kerogen types,organic matter maturity reach maturity-high level of maturity is China's land and sea interaction phase shale of the basic characteristics,these characteristics formed late in shale gas exploration and development of favorable factors.On the other hand,the higher content of clay mineral composition is another prominent feature of mud shale in the study area,Qinshui Basin of Shanxi Formation in the clay mineral content is the highest,the average value of 58%;secondly,Ordos Basin and the southern North China Basin;clay mineral content less for the Sichuan Basin,mean is only about 13%.The formation of high clay mineral content is unfavorable to the development of shale gas in later stage.Comprehensive analysis that the transitional facies strata of shale gas distribution,large thickness and distribution is relatively stable,sand and mud interbed is rhythm development,multi intercalated with coal seams,dominated by type II and III type of organic matter,high abundance of organic matter,paralic facies shale facies change fast,monolayer thickness,average thickness of generally less than 15 m,often with coal,and tight sandstone and limestone interbedded developed separately the thin layer of shale gas in coal measures face the great challenge in the development costs and technology in general,shale gas,tight gas and coalbed methane multi objective layer joint development is a new effective way.