Study On Sedimentary Facies Of Yingcheng Formation In Sujiatun Area Of Lishu Rift

Lishu fault is located in the southeast uplift area of songliao basin, is a fault basinof west off the loop shape of ne, Su Jiatun region is located in the northwest part ofslope zone in the north of Lishu fault depression. Paper focuses on sedimentary faciesand characteristics Yingchen formation of Su Jiatun region In high precision sequenceframework, to study the sequence characteristics, the types of sedimentary facies,provenance system features, reservoir characteristics, and combining the NorthernSlope belt of tectonic background, analyze the characteristics of sedimentary facies inthe study area.By analyzing the drilling core, well logging, mud logging and high resolutionseismic data, identify the four types in study area drilling sequence interface,4typesof earthquake sequence interface. The establishment of a unified sequencestratigraphic framework; The Lishu down-faulted Huo shi lin group and dengloukugroup is divided into seven tertiary sequences (SQ1-SQ7); Huo shi lin group isformed during the subsidence stage of the initial crack a secondary sequence, isdivided into two tertiary sequences (SQ1, for SQ2); Shahe subgroups and battalioncity group building common rapid chasmic stage of secondary sequence stratigraphicsequences, is divided into four level3sequence (SQ3-SQ6);On the basis of core observation, according to the lithology, mudstone color,sedimentary structure, fossils and logging characteristics, Su Jiatun region can bedivided into7kinds of core microfacies types, and establish the rock-electr relationchart and log facies chart; According to the slope structure and geomorphologycharacteristics, and decentralized system and seismic equal characteristics, sandstoneSu Jiatun district shahe son lower sequence development mainly in the southeast,other scope belong to the hiatus area, northeast provenance mainly come from thearea. Sha he zi formation sedimentary period, Su Jiatun area source mainly comesfrom northeast, respectively into Su Jiatun northern sub-sag, and mulberry sub-sag.City formation sedimentary period, Su Jiatun area source mainly comes from thenorth and North-East.Hydrocarbon source rock analysis assay data analysis showed that the city group ofshahe subgroups with large set of dark mudstone with good hydrocarbon generationability, is also a good regional cap rocks. Su Jiatun area hydrocarbon source rocks andcap condition is good. Sand body and unconformity are the main channels for lateralhydrocarbon migration, and multiphase tectonic movement formed a lot of fault communication effect. Coupling matching relation between oil and gas, reservoir andcap is good, good concealed lithologic traps are mainly have the fault communication-fault combination traps and nearshore subaqueous fan fan updip pinchout sand body;Lithology, fault combination trap distribution on the Northern Slope, nearshoresubaqueous fan sand body traps controlled by mulberry fan end fracture, the fracturedistribution.