Study On Exploitation Potential Evaluation Of Carboniferous Reservoir By WQJ Structure

WQJ is a pre-Daba mountain arc fold belt,connected with Luojiazhai structure in the east,BJC syncline with the Qilixia structural belt in the west,the structure of the Dukouhe structure in the north and the SGP structure in the south.From 1984 to 2001,Sichuan Geological Administration conducted a survey of four rounds of earthquakes in the WQJ structure.In July 2001,the Exploration and Development Research Institute of Southwest Oil and Gas Field Branch used the above seismic data to reprocess the western section of WQJ structure Explain the work.In 2010,Chuanqing Drilling Geophysical Center compiled the top structure of Carboniferous using 3D seismic data.As of the end of June 2016,there were 11 wells drilled at WQJ,including 6 wells drilled through the Carboniferous(WQ1-1,2,3,5,6,and 11 wells)and 3 Mouth(WQ11,WQ1-1,WQ2);among them there are 3 dry wells(WQ6,WQ5,WQ6).It was discovered that WQJ constructed Carboniferous and Jia 2 gas reservoirs.The WQJ structural carboniferous gas reservoirs are the main gas reservoirs currently under development and production.WQJ Structure In the development and production of the developed zone(North),"Single-well production decreased and the overall North coal production was not high".The 3D seismic data show that the undeveloped area The reason is that the formation pressure is obviously higher than the current formation pressure in the northern part of the country.Numerical calculation of reserves shows that the reserves of the undeveloped area(southern part)have not been utilized.Therefore,it is necessary to evaluate the development potential of Carboniferous gas reservoirs constructed by WQJ,and to use the data of the completed drilling well to correct the tectonic map of the top seismic reflection in the latest Carboniferous topography interpreted by the 3-D seismic interpretation,and to study the structure and distribution characteristics of the gas reservoirs.Carboniferous strata were divided and compared.Carboniferous reservoir sedimentary microfacies were studied and single-well sedimentary microfacies comprehensive histogram was compiled.Based on the analysis of 6 drilling,well logging,core analysis and sheet identification data and testing data,The controlling factors of reservoir development and physical properties of reservoirs are analyzed in depth,and the properties of reservoirs are comprehensively evaluated.The vertical and horizontal distribution of reservoirs are studied,and the integrated map of single well reservoir and the contrast profile of reservoir continuous wells are compiled;Study fluid properties,gas-water relations and gas reservoir types;analyze pressure system characteristics,reservoir seepage media types and gas reservoir driving types in Carboniferous gas reservoirs;analyze gas well gas dynamic characteristics;The output is analyzed and evaluated;the pressure drop method is used to calculate the single well control dynamic reserve;the well test data are explained;The gas reservoir reserves are calculated and evaluated;the gas reservoir geological model and numerical model are established;the ECLIPSE reservoir simulation software is used to carry out gas reservoir simulation research;based on the study of gas reservoir geology and gas reservoir engineering,Put forward the geological target of deployment of well and forecast the development index.