Research On Reservoir-Forming Rule In Dehui Depression Middle-shallow Layer Of Song-liao Basin Southeast Uplift Area

This article relies on the researching of the entire song-liao basin southeast uplift area a combination of the latest theories and methods of sequence stratigraphy, sedimentology, structural geology, petroleum geology and seismic stratigraphy etc., the use of seismic, well logging, mud logging, core analysis data, to analysis and research on the southeast uplift Dehui depression sequence stratigraphy framework, sedimentary facies. On this basis, the comprehensive use of petroleum geology, geochemical analysis testing data, research on source reservoir cap assemblage rule in study area, and prediction of middle-shallow layer oil and gas exploration in favorable zone.The study on the southeast uplift Dehui Depression oil and gas sources, source rock quality and hydrocarbon supplying ability of source rocks etc. hydrocarbon source detailed analysis and research. Through the relevant geochemical indicators, including source rock organic carbon, chloroform bitumen "A" content analysis, obtained in middle-shallow layer the original oil and gas sources of oil and gas, mainly from Qingshankou group and Denglouku group, but the number of less difficult to form large-scale oil and gas reservoirs, in middle-shallow layer should still mainly look for the secondary oil and gas reservoirs, its oil and gas mainly comes Yingcheng group and Shahezi group.The cap rock of this area mainly is Qingshankou group mudstone,Quaner segment mudstone, Yingcheng group mudstone and Shahezi group mudstone.This paper comprehensively consider source reservoir cap trap ect.basic conditions for the formation of reservoir ,analysising oil and gas reservoir-forming rule of Dehui depression, in middle-shallow layer the mainly reservoir is the secondary oil and gas reservoirs,main controling factors of hydrocarbon accumulation is control source fault,the middle of Dehui- Xiaohelong depression is middle-shallow layer favorable perspective play,south changshun fault is oil and gas exploration potential favorable zones of middle-shallow and deep layer.