Research On Distribution Characteristics Of Bedrock Reservoir In Binxian Uplift Of Dongying Depression

In recent years,bedrock oil and gas reservoirs with a production capacity of more than 5 million tons have been discovered in many basins.Among them,weathered crust reservoirs are very important types of bedrock reservoirs.Bedrock reservoirs have become Dongying Depression and even national oil exploration.New areas.Previous studies on the dynamic process of formation and evolution of bedrock reservoirs are not thorough enough,and there are few studies on the reconstruction and destruction after the formation of bedrock reservoirs.At the same time,the study of seismic reflection characteristics of different weathered crust structures is not yet mature.As a result,the existing weathering crust structure division scheme is difficult to be practically applied,making it difficult to predict the distribution of bedrock reservoirs.In this paper,the Archaeozoic bedrock buried hill in Binxian Uplift area of Dongying Depression is taken as the research object,combined with the geological data,logging data and seismic data in Binxian area,a comprehensive geological-geophysics research method is used to evaluate the bedrock reservoir Structural characteristics,formation mechanism,control factors and distribution characteristics have been systematically studied.The thesis mainly achieved the following four results:(1)Proposed a new plan for the double-layer structure of granite weathering crust,clarified that the formation of the weathering crust is a geological dynamic process,and established a dynamic genetic model of the bedrock weathering crust in the work area;(2)The use of frequency-division reconstruction technology has significantly improved the seismic resolution and divided four seismic phases.Strong amplitudes correspond to residual layers,medium amplitudes correspond to dissolved layers,and weak amplitudes to blanks correspond to disintegrating layers.Typical seismic facies are used to predict the distribution characteristics of weathered crust reservoirs;(3)Reinterpret faults in the work area and clarify the development of the work area Three types of faults,northwest,northeast and near east-west,propose the control effect of fault rotation tilting on the bedrock reservoir,especially the reformation of deep faults on reservoir occurrence;(4)effective formation of weathered crust in the work area The comprehensive prediction method of the reservoir has determined the distribution characterist ics of the weathered crust of the bedrock.It is believed that the high part of the structure is mainly disintegrated,the residual layer is developed on the gentle slope of the convex edge,and the dissolution layer is developed in the low part of the structure.The working area has favorable reservoir distribution blocks,and predicts the favorable exploration target of the weathering crust in the working area.This study provides new ideas for the exploration and evaluation of bedrock oil and gas reservoirs,and has important guiding significance for promoting the study of weathered crust reservoirs in bedrock.