为提高四川盆地深层页岩气规模有效开发，以威远页岩气田202和204井区

In order to improve the scale and effective development of deep shale gas in the Sichuan Basin, the well blocks 202 and 204 of the Weiyuan shale gas field are taken as the target blocks, the geological engineering integrated research idea is adopted, the in-situ stress field finite element calculation process is proposed and the block three-dimensional Numerical solution of fine ground stress field. First, use the horizon information provided by the seismic waves to establish a geological model and a finite element mesh model, and then combine the single-well geomechanics analysis to establish a three-dimensional in-situ stress field of the target block, and finally complete the finite element mechanical modeling, and finally obtain the inland areas of the two blocks. Distribution of stress. In Block Wei 202, the maximum horizontal principal stress of Wufeng Formation-Longmaxi Formation reservoirs gradually transitioned from 130° in the northwest/upper left part to nearly 90° in the southeast/lower right part, showing a strike-slip fault stress pattern. In Block 204, the maximum horizontal principal stress and the vertical stress of the Wufeng Formation-Longmaxi Formation reservoirs are close, and the local stresses coexist in a normal fault stress mode and a strike-slip fault stress mode. The method proposed in the study effectively compensates for the disadvantages of the large error of the analytical method, and the obtained three-dimensional fine in-situ stress field can be used for the optimization of horizontal well layout design and the improvement of hydraulic fracturing efficiency.

In order to improve the scale and effective development of deep shale gas in Sichuan Basin, taking well blocks 202 and 204 of Weiyuan shale gas field as the target block, adopting the research idea of geological engineering integration, the finite element calculation process of in-situ stress field is proposed, and the numerical solution of three-dimensional fine in-situ stress field is given. Firstly, the geological model and finite element mesh model are established by using the horizon information provided by seismic waves, and then the three-dimensional in-situ stress field of the target block is established by combining the single well geomechanical analysis. Finally, the finite element mechanical modeling is completed, and finally the stress distribution in the two blocks is obtained. In block Wei 202, the maximum horizontal principal stress of Wufeng Longmaxi formation reservoir gradually transits from 130 ° in the Northwest / upper left part to nearly 90 ° in the Southeast / lower right part, showing a strike slip fault stress mode. In block 204, the maximum horizontal principal stress and vertical stress of Wufeng Longmaxi formation reservoir are close, and the local stress is positive, and the fault stress mode and strike slip fault stress mode coexist. The proposed method can effectively make up for the large error of the analytical method, and the obtained three-dimensional fine in-situ stress field can be used for the optimization of horizontal well layout design and the improvement of hydraulic fracturing efficiency.

In order to improve the scale and effective development of deep shale gas in Sichuan Basin, taking wells 202 and 204 of Weiyuan shale gas field as the target blocks, adopting the idea of integrated geological engineering research, the finite element calculation flow of in-situ stress field is put forward and the numerical solution of three-dimensional fine in-situ stress field is given. Firstly, the geological model and finite element mesh model are established by using the horizon information provided by seismic waves, and then the three-dimensional in-situ stress field of the target block is established by combining with the single well geomechanical analysis. Finally, the finite element mechanical modeling is completed, and finally the distribution of the in-situ stress in the two blocks is obtained. In Wei 202 block, the maximum horizontal principal stress of Wufeng Formation-Longmaxi Formation reservoir gradually transits from 130 in the northwest/upper left part to nearly 90 in the southeast/lower right part, showing a strike-slip fault stress pattern. In block 204, the maximum horizontal principal stress of Wufeng Formation-Longmaxi Formation reservoir is close to the vertical stress, and the local stress is normal fault stress mode and strike-slip fault stress mode. The proposed method can effectively make up for the big error of analytical method, and the obtained 3D fine in-situ stress field can be used to optimize horizontal well layout design and improve hydraulic fracturing efficiency.