A Study On Sedimentary System Of The Shahejie Formation In Bamianhe Area Of Dongying Depression

Bamianhe area is located in eastern South Slope of Dongying Depression. As one of the enrichment zones of oil and gas,Shahejie formation is its major oil and gas formation. The purpose of this thesis is to build the sequence stratigraphic framework of Shehejie formation,and take into stratum structure,depositional system and other research of the key layer. The research results can provide guidance on the next step of oil and gas exploration and development.On the basis of the stratigraphic character,we can divided Shahejie Formation into six third-order sequences. Sequenceâ…¢can be subdivided into transgressive and regressive systems tract. Other third-order sequence can be subdivided into lowstand systems tract,transgressive systems tract and highstand systems tract. According to the observation of the cores,the study on the types and combinations of rock,sedimentary structures,facies sequence,features of paleontology facies analysis of single well,found that Bamianhe area developed beach-bar,delta and carbonate beach.Beach-bar sedimentary body mainly developed in Es4.Then material source of supply is to strengthen, the delta is dominated in the sedimentary facies.With the delta continue to advance from east to west,the delta surfaces fully developed during the next periods.Beach-bar,delta and carbonate beach are the main sedimentary facies for reservoir.Reservoir is high-super porosity and mid-high permeability.The relationship of porosity and permeability is positive,which indicates that porosity development control the permeability.The research above suggest that the factors control reserovir are sedimentary facies,diagenesis and tectonics.