Sedimentary Characteristics In East Margin Of Songliao Basin During Permain

With the advance of exploration and development technology,people pay more and more attention on the resource potential of Permian stratigraphic in Chinese northeast area.This research study based on outdoor geological survey,former research data and experimental geochemical data,comprehensive and analysis Permian stratigarphy of target area,indentify and classify the sedimentary facies,restore lithofacies palaeogeography of target areas,summaried source rock indictors and oil and gas resource potential conclusions are as follows:(1)Four sedimentary facies developed during early to middle Permian epoch in east edge of Songliao basin area: Carbonate platform facies,shallow sea shelf facies,bathyal facies and delta.During late Permian epoch there developed two sedimentary facies: lacustrine facies and delta facies.(2)In early Permian period,intra-areas mainly develop shallow sea environment.With the frequent volcanic periodically activities,in eastern part of the area turn to transitional delta facies.During middle Permian period,with constantly transgressive,target area develop to a large area shallow sea.During later Permian period,water gradually exit from the northeast region,lead to the lake level gradually slow down.So the target area transform to shore-shallow lake and semi-deep lake sedimentary environment.(3)Shale in Yangjiagou formation and Hongshan formation in upper Permain and black mud and deposited in Tumenling formation and Fanjiatun fotmation of middle Permain in eastern edge of Songliao basin have source rock potential.Organica matter type mainly belong to type ?,in the stage of high mature,classify to mid-class source rock.In terms of oil and gas resources perspect,Yichun city and west Daqing city-middle Acheng city-The south of Changchun city in the north of target area have better hydrocarbon resource potential.