Carbonate Reservoir Characterization Of The Fourth Section Of Dengying Formation In Gao Shi Ti-Mo Xi Area

In order to clarify the exploration direction,preferred exploration targets and late gas reservoir development characteristics of the Dengying Formation in the Gaoshiti-Moxi area of the Sichuan Basin,this paper studies the characteristics of the carbonate reservoirs in the study area.This study uses relevant theories and technical methods of sedimentology and petrology,carbonate reservoir geology,logging geology,etc.,combined with regional geological data,core data,sheet data,logging data and seismic data.Based on the basic data,the qualitative and quantitative description of the reservoir was carried out in the fourth section of the Dengying Formation in the study area.Comprehensive drilling and oil test mining data are used to carry out detailed study of structural features,to carry out stratigraphic division and comparison,to establish phase profiles by single well phase division,and to study the sedimentary microfacies plane distribution and its evolution law in combination with seismic facies.The segment mainly develops the hilly beach and the Taiping subfacies;through the analysis of the geological and seismic characteristics of the reservoir in the study area,the qualitative description of the fourth member of the Sinian Dengying Formation is carried out,and the favorable area is divided.According to the geological characteristics of the target interval,the reservoir shadow inversion method was used to carry out reservoir fine prediction research,and finally the reservoir was comprehensively evaluated.The main achievements are as follows: The fourth section of the Dengying Formation is mainly distributed along the rim margin.The scale and location of the shoal body control the geometric shape,internal structure,reservoir thickness and physical properties of the reservoir;karst paleotopography to the fractured hole The reservoir development has obvious control effects;the fourth gas reservoir of Gaoshi Laiguangying Formation is mainly controlled by tectonic,hilly,karst and fracture development;Moxi block is mainly controlled by hilly beach,karst and fracture development.