Prediction Of "Sweet Spot" Of Longmaxi Shale Gas Reservoir In Dingshan

Drilling and research have proved that Wufeng Longmaxi formation in Southeast Sichuan has a good shale gas exploration prospect.The jiaoshiba shale production area around the study area has begun to take shape.Many exploration wells in Dingshan area have also seen good gas logging anomalies in the Wufeng Longmaxi formation of the area.It shows that some shale gas wells have obtained industrial gas flow after fracturing transformation.On the whole,it shows that the Wufeng Longmaxi formation shale gas resource potential is large and the resource abundance is high.However,due to the low degree of exploration,complex geological conditions and strong heterogeneity of the target layer,the geological understanding and model of the target area have multiple solutions.In order to achieve the shale gas commercial breakthrough in the target area as soon as possible,to search for geological and Engineering "sweet spots" and to optimize new exploration well locations,it is necessary to conduct joint research on the existing drilling and seismic data.Based on the analysis of shale gas well data in the area and adjacent areas,the shale reservoir characteristics of Longmaxi formation are summarized,and it is clear that Wufeng Formation and the I sub member of the first member of the Longmaxi formation are high-quality shale sections of shale gas.The high-quality shale section in Dingshan area has high TOC and good gas bearing property,and the thickness of most areas is more than 30 meters,which is favorable for shale gas.Through the fine structural interpretation of this area and the study on the structural model of surrounding blocks,the structural characteristics of the study area are further clarified,and the understanding of the structural characteristics of the southeast edge of Sichuan Basin is deepened;the influence of the structure on the preservation conditions of Dingshan area is analyzed;the influence of the structure on the preservation conditions of the Dingshan area is analyzed;and the single well is used On the basis of reservoir characteristics analysis and petrophysical analysis,through pre stack elastic parameter inversion,the prediction of high-quality shale thickness,TOC,gas bearing property and brittle formation pressure is completed,and the distribution law of high-quality shale is clarified.Based on the analysis of single well fracture development law,the post stack seismic attribute analysis and pre stackazimuth attribute study are used to analyze the fracture characteristics of different scales in detail Development law and its influence on horizontal well fracturing and shale gas production.Finally,the "double dessert area" is selected,which is located in the middle of the work area,with an area of about 127 square kilometers.