Structural Evolution Of Haerbin-Suihua Area In East Songliao Basin And Its Control Over Hydrocarbon Formation Condition

The songliao basin is a large superposed petroliferous basin with rift-depression dual structure.lt has multiple stage-times structural movements and multiple stage-times hydrocarbon formation. Structural evolutions control hydrocarbon formation importantly. The Haerbin-Suihua area is located in eastern Songliao basin, suffered uplifting and denuding intensely. The research on the relationship between structural evolution and hydrocarbon formation conditions has important significance in theory and practice .Based on outcrop, geophysical data interpretation, well drilling and geologic data else, by using integral, dynamical, synthetical rule and using basin analysis, tectonic theory, and petroleum system guide, the paper analyzed structural feature and evolution in Haerbin-Suihua aera systematically, structural evolutions have an important control on hydrocarbon formation conditions, sums up oil-gas forming modes of rifted basin, control factors and formation regularity, Predicts favorable exploration zones which have important guide on next exploration of this area.Research shows that the basement of Songliao basin is made up by gneiss, phyllite, schist, slates and granite mainly. It has the feature with divided zones between east and west and fault blocks between south and north cortolled by north-east, north-west and east-west faults. The layer formed in rifted basin stage of Songliao basin have the feature with divided zones between east and west and fault blocks between south and north totality. The rifts are north-north-east, north-east and near to south-north totality. The faults controlled rifts is main north-north-east and north-west orientation. The layer formed in rifted basin stage is divided five structural units: western rifted area, western uprifted area, middle rifted area, middle uprifted area and eastern rifted area.The research on stratigraphic correlation based on making stratigraphic Division with an important parameter well Bincan 1 in Haerbin-Suihua area by using regional label bed, lithologic character, electrical characteristics, palaeobiology and igneous rock ages shows that sedimentary Covers in this area have Mesozoic Erathem Cretaceous system Huoshiling formation, shahezi formation, yicheng formation, denglouku formation, quantou formation, qingshankou formation, nenjiang formation, Cenozoic Erathem Tertiary and Quaternary.Research based on palaeobiology, seismic profile, electrical characteristics, drilling core observation, granularity and trace element data showed that the sedimentary facies type mainly has the alluvial fan, the delta, thelake, the floodplain and volcanic face. Sedimentary facies distribution and evolution are controlled by structure evolution. The period of rifted basin is from Huoshiling formation to Yingcheng formation sedimentary, the sedimentary facies belt distribution and the deposition scope are controlled by the large fault obviously, mainly grows the alluvial fan, the fan delta, the lake and volcanic face. The early time of Denglouku formation sedimentary belongs the transformed stage from rifted basin to depression basin, the sedimentary facies belt distribution still are controlled by large faults. The depression basin stage is from two section of Denglouku formation to Nenjiang formation deposition period, the deposition scope gradually expanded, the depocenter gradually migrated to the basin center, the deposition type is evolved gradually from the river to the deep lake, the deposition scope of the lake face achieved in a big way. After Nenjiang formation deposited, the research area suffers the extrusion to uplift, ans denuded intensely, the developmental stage of lake deposition is over.Research about the fault feature by using heavy magnetism and seismic data shows that the main body structure of based faults is near to east-west and north-west orientation. The faults near to east-west and north-west orientatidn controls the structural formation and evolution of this. area. The rifted basin is mainly single break structure, its orientation is north to west, the north-west faults control the formation and evolution of rifted basin. The orienration of cap rock faults is controlled by based faults .From deep to shallow layer, the fault trend gradually transforms from north-north-east and north-west primarily to north-north-west and north-west primarily. The fault structure style mainly is Y shape, ladders shape and feather type.The strata formed in rifted period have alternating characteristics between rift and uplift. It is divided five structural units: Suileng uplifted belt, Suihua-tieli rifted belt, Bayan uplifted belt, Miaotaizi-binxian rifted belt,Acheng-wuchang uplifted belt from north to south. The strata formed in depression period have structural framework with four depression, two uplift and one slope. It is divided seven structural units: Suileng anticline belt, Suihua depression, Qingan uplifted belt, Dongxing depression, Binxian depression, Qingshankou uplifted belt and Yushu depression from north to south. Binxian rift lies in the north-west structural inversion belt, its fault body structure displays north-west controlled by large north-west fault. North-west Binanzhen fault controls mainly the formation and growth of Binxian rift. Binxian rift in the whole has two hollow, one uplift and two slopes structure characteristics.Research on the denuded thickness by using vitrinite reflectance, interval transit time and seismic profile data shows that denuded thickness is East strong and west weak, south strong and north weak. The research on structure evolution indicated that this area experienced rifted period from Huoshiling formation to Yingcheng formation sedimentary, stage from rifted basin to depression basin amount to time of Denglouku formation sedimentary, depression stage amount to time from Quantou formation to Qingshankou formation sedimentary and extrding inversion from Nenjiang formation to Mingshui formation sedimentary.Structure evolution has an important control on each conditions of hydrocarbon formation. Structure evolution controls the hydrocarbon source rock growth, and the association between the reservoir and the cap rock, the trap formation and distribution and the type and the preserved conditions. This area has many rifts, the hydrocarbon source rocks is vegetation and the scale of rift controls the resources quantity sizes.On the basis of the structure character and evolution, it makes each rift to Compare with appraisal. Making an evaluation on Binxian rift and precdit advantageous area belt according to petroleum system theory on basis of analyzing hydrocarbon source rock, the reservoir, the cap rock, the trap, the oil gas migration and so an.