Seismic Sedimentology And Its Application Of The Upper Fourth Member Of Shahejie Formation In The Bonan Subsag

The Bonan Subsag is located in the central and western part of the Zhanhua Depression in the Jiyang Depression.It is the largest subsidence in the Zhanhua Depression,and the sag is a steep and uplifting basin in the northwest.In the study area,there is a lot of controversy about the sedimentary facies type and the sand body distribution,and it needs to be studied deeply.Moreover,it is difficult to study the reservoirs and reservoirs in the study area,and it is difficult to study the distribution of reservoirs.It is difficult to solve the problem of reservoir distribution by seismic sedimentology.In the study area,the sedimentation of the target layer is complicated,the lateral variation of the sand body is large,the well point distribution is irregular and the isochronal stratigraphy is difficult to compare.In this paper,the stratigraphic framework of the upper reaches of the upper reaches of the Shahejie Formation is established by using the sequence stratigraphy principle and the frequency division interpretation technique.The purpose of the segment is divided into a three-level sequence,three four-level sequence.In the study area,the upper sub-section of Shahejie Formation is characterized by the southern margin of the north,and the strata development of the first and second sand groups is more stable.Geological data and seismic data are used to study the sedimentary microfacies of the target layer in the study area.Based on the theoretical and technical methods of seismic sedimentology,the main use of stratigraphic section,seismic attribute optimization analysis,frequency interpretation,seismic waveform classification technology,combined with sandstone percentage of sandstone,under the guidance of geological model,the Bonan Subsag and the sedimentary microfacies distribution of the sand group is analyzed.The sedimentary microfacies of the sand group and the sand group are obtained.In this paper,the sedimentary characteristics of the Formation are summarized as follows: the fan delta frontier in the northern part of the Formation has the fan delta front development near the Bohai deep well,and the lake fan near the Y160 well is developed.Compared with the three sand groups and the four sand groups,the development range is limited,Mainly in the northern part of the study area development,and in the XBS1,righteousness Y179 and Y180 line formation overlying,to the development of fan delta leading edge deposition.In this study,the purpose of this study is to solve the problem of incomplete sedimentary facies types in the upper Es4 of the study area by the study of seismic sedimentology,and to reveal the sedimentary facies and sedimentary facies of the sedimentary facies in the study area.Through the study of seismic sedimentology,the problem of sandbody distribution in the target area is solved.Based on the study of sedimentary facies and the establishment of sedimentary facies in the study area,the guiding basis and technical support for the next survey of the study area are provided.