3）最大水平主应力有时沿水平方向有时不是，应视具体计算结果布局井位和长

3) The maximum horizontal principal stress is sometimes not along the horizontal direction, and the well location and length should be laid out according to the specific calculation results. The study refers to the microseismic monitoring information to determine the main direction of the in-situ stress and the verification of the calculated value of the three-dimensional in-situ stress field, which effectively reduces the calculation error. The use of finite element numerical analysis in engineering research can make up for the inaccuracy of the analytical solutions. The obtained three-dimensional fine geostress field numerical solutions of Wei 202 and Wei 204 blocks in the Weiyuan shale gas field can help optimize the layout of horizontal wells. Well design and selection of technical parameters for hydraulic fracturing.

3) The maximum horizontal principal stress is sometimes along the horizontal direction and sometimes not. The well location and length shall be arranged according to the specific calculation results. This paper studies the verification of the principal direction of ground stress and the calculated value of three-dimensional ground stress field with reference to the microseismic monitoring information, so as to effectively reduce the calculation error. The application of finite element numerical analysis method in engineering research can make up for the disadvantage that the analytical solution is not accurate enough. The obtained numerical solution of three-dimensional fine in-situ stress field in Wei 202 and Wei 204 blocks of Weiyuan shale gas field can help to optimize the well layout design of horizontal wells and the selection of technical parameters of hydraulic fracturing.

3) The maximum horizontal principal stress is sometimes not along the horizontal direction, and the well location and length should be arranged according to the specific calculation results. Study the verification of determining the main direction of in-situ stress and the calculated value of three-dimensional in-situ stress field with reference to microseismic monitoring information, and effectively reduce the calculation error. The application of finite element numerical analysis method in engineering research can make up for the shortcoming that analytical solutions are not accurate enough. The obtained three-dimensional fine numerical solutions of in-situ stress field in Wei 202 and Wei 204 blocks of Weiyuan shale gas field can help to optimize the layout design of horizontal wells and the selection of technical parameters of hydraulic fracturing.