Principles Of Hydrocarbon Accumulation Of Tight Gas Reservoir In Changling Rift

Changling rift contains two stage rifts in formation and depression formation. Changling fault depression is made up of Qianbei, Daan, Qianshenzl, Hashituo, Heidimiao,Haerjin, Fu longquan seven secondary sub-sags, mainly for the deep rift period sedimentary limnetic facies sand shale strata. Control of shallow strata in Songliao basin depression period evolution, sedimentary mainly fluvial facies, delta facies sand shale formation.Changling fault depression is rich in resources but in addition to Fushuangda zone, deep clastic buried depth, poor reservoir property, the use of high cost, difficult technology, basic research is weak. Main purpose of this study is to evaluate the Changling fault depression and advance peripheral fault depression, the implementation of tight gas and volcanic exploration potential. In Changling sag Denglouku group, the second part of the YingCheng Formation tight sandstone reservoir characteristics and analysis of main controlling factors, and Chang ling fault depression accumulation regularity of tight sandstone gas reservoir, formation of tight sandstone gas reservoir forming model.Patterns through the application of accumulation model Fulongquan fault depression, F14 well group of air flow to get a high yield, reveal new field primary gas reservoir exploration. Fulongquan develops three secondary sub-sags, at the same time is controlled by longquan fracture. The Yingcheng formation, Shahe formation and Huoshiling formation of three sets of dark mudstone and coal seam fire stone mountain group, a total of four sets of hydrocarbon source rock, overall has good hydrocarbon generation ability; Southern of late subsags inversion effect is weak, the fracture development, is to find the preferred primary gas zone; Late middle subsags inversion effect is strong, but the city group of the lower and Shahe formation poor physical properties, with the conditions of the formation of tight sandstone gas reservoir. Second, further evaluation of Daan gas accumulation conditions. Compared with adjacent regions to carry out that Daan down-faulted battalion Yingcheng formation, Shahe formation, Huoshiling formation relative to implement, can develop good hydrocarbon source rock, trap and the development of a variety of types, good preservation condition, is advantageous in search of tight gas zone.