Shale gas reservoirs have the characteristics of low porosity and low permeability.The large-scale exploitation of shale gas requires the reconstruction of shale reservoirs through horizontal well fracturing technology.Available data indicate that,when the horizontal shale gas well azimuth is approximately perpendicular to the maximum horizontal principal stress,and the coefficient of difference in horizontal in-situ stress is small,it is favorable for fracturing to form network fractures and improve the effect of reservoir reconstruction.An in-situ stress prediction model was established for the Nanchuan area.On the basis of detailed 3D seismic interpretation and 3D seismic prestack inversion,the regional adaptive parameters were selected by using well data simulation,and the 3D simulation of the in-situ stress field was performed to predict the direction of the maximum horizontal principal stress,the direction of the minimum horizontal principal stress and the coefficient of in-situ stress difference.Through an analysis of the regional stress mechanism and the interpretation of the induced joint and the analysis of the application,the reliability of the in-situ seismic prediction results was verified,and the important role of in-situ stress analysis in shale gas development was proved.
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