A Sedimentary Model-based Seismic Sedimentology And Its Application

In the middle of the Xianhe belt and the Niuzhuang area,the regional structure is located in the middle of the central uplift zone of the Dongying Depression and the central part of the Dongying Depression.The turbidite sand bodies in the third member of the Shahejie are extensively developed in the study area and the lithologic assemblages of the turbidite sand bodies are quite different.The regional reservoir development is different,which affects the accuracy of effective reservoir prediction.This thesis carried out seismic sedimentology research on the turbidite sand bodies in the middle of the Shahejie Formation in the Niuzhuang area.The objective is to establish a stratigraphic and chronological framework of the stratum in the study area,to reveal the distribution patterns of the target unit and facies.It is necessary to explore the research methods of the combination of the well-log and seismic data,and to carry out the isochron stratigraphy and its sedimentary facies to provide a geological guidance for further reservoir development.The area of the study area is large,the delta progradation is obvious on the seismic data,Which is characterized by strong diachronous.It is impossible to determine the distribution patterns of the isochrons.It is necessary to carry out isochronal stratigraphic framework research based on seismic sedimentology.The methods of "cycle comparison,hierarchical control,well-shock combination" were used to divide and illustrate the isochronous stratigraphic interface step by step.Based on the sedimentary evolution of the core and the logging,the classical sequence stratigraphi principle and the frequency division interpretation,wavelet decomposition and reconstruction are combined to study the stratigraphic division of the middle section of the Shahejie Formation in the study area including one third-order sequence and six fourth-order sequences.Seismic wavelet decomposition and reconstruction techniques were ueed to interpret horizons and faults to identify their distribution,so as to establish different levels of isochronous stratigraphic framework.The middle Es3 sand is divided into six sand groups,the thickness of each sand unit changes greatly.Based on the analysis of the core sedimentary facies,the sedimentary system of the delta-turbidite is established by studying the sedimentary characteristics of the target interval from core analysis.Based on the analysis of sedimentary facies,logging facies and seismic facies,sedimentary microfacies types were analyzed.The vertical distribution characteristics of sedimentary microfacies were studied by single well facies analysis.A sedimentary model was established.Seismic interpretation in the study area was developed under the guidance of deposition model.The seismic response characteristics of turbidite sand bodies are studied by forward modeling technique.The seismic properties of the turbidite sand bodies are studied by seismic attribute optimization analysis and stratigraphic section technique.The distribution regularity of the two types of turbidite sand bodies in the middle section of the Shahejie Formation in the study area is finally identified,and the sedimentary evolution of the target interval is revealed.