Analysis Of Paleogene Dongying Sand Core Enrichment Factors In Central Of Liaodong Bay

In recent years,in the context of deep exploration and continuous improvement of accuracy requirements,it is necessary to deepen understanding of geological features of Liaodong Bay exploration area,increase the exploration success rate,and promote the exploration of Liaodong Bay based on the interpretation of contiguous processing of 3D seismic data in the entire region.The exploration area once again strided.The current exploration difficulties are that the high-resolution sequence frameworks,sedimentary systems,and depositional facies of the Neogene and Paleogene in the Liaodong Bay are unclear.The distribution regularities and the causes of favorable sedimentary reservoirs in the sequence stratigraphic framework are not clear.This paper applies the relevant principles and research methods of sequence stratigraphy and sedimentology,and establishes a refined sequence stratigraphic framework to study and analyze sand control models in the central of Liaodong Bay,and provides guidance for oil and gas exploration from the perspective of sedimentary filling and evolution.This paper takes the Paleogene Dongying Formation in the central of Liaodong Bay as the research object.Starting with the basic theory of sequence stratigraphy,this paper explains the sequence interface types and the divisional signs of the Paleogene Dongying Formation in the central of Liaodong Bay and divides the Dongying Formation into three three-level sequence: SQd1,SQd2,and SQd3.Based on this basis,the isochronal sequence stratigraphic framework of the area was established to provide reference for the analysis of sand control factors and the establishment of the model.Through the analysis of sedimentary structure signs,logging phase markers,paleontological fossil markers,and seismic facies markers in the study area,the sedimentary systems identified during the various sequence stages of the Dongying Formation mainly include braided river deltas,lakes,and sublacustrine fans.The characteristics of different sedimentary facies are described.In the stratigraphic framework,combined with sedimentary system analysis and seismic section interpretation,the sand body plane distribution characteristics in each sequence period of the study area were analyzed in detail.From the south to the north,two seismic profiles were selected for the sequence The structural features of the filling structure in the grid were drawn and the sedimentary facies plan was drawn.At the same time,the controlling factors of the Fusha sedimentary system in the Paleogene Dongying period in the central of Liaodong Bay are discussed in detail.It is pointed out that the source system and tectonic paleogeomorphology control the accumulation and integration of the sand bodies and establish the sand control model in this area.