# A Study on the Remaining Reserves of the Weiyuan Shale Gas Block in Three-Dimensional Development
## 7 Conclusions  
(1) Evaluation of the remaining reserves in the Weiyuan production zone shows that horizontal wells can only control 35% to 60% of the geological reserves within the well control area, leaving 40% to 65% of the vertical remaining reserves undeveloped. The average remaining reserve of platform wells is (1.2-3) \(\times\) 10\({}^{8}\) m\({}^{3}\), and there is potential for development in local areas.  
(2) Based on topological analysis, stress-driven and rock mechanics theories, a three-dimensional geologic model, a fracture model, and a rock mechanics model of the Weiyuan shale reservoir were simulated and modeled. The analysis shows that the absolute stress difference of the Longyi14 minor layer in the study area is less than 5 MPa, there is no obvious stress isolation section, and the combination of [PERSON]'s modulus-Poisson's ratio of the Longyi14 minor layer is better; the longitudinal distance of the upper part of the Longyi14 minor layer from the top of Longyi11 layer is distributed in the range of 18-28 m, which is capable of avoiding the strong inter-well interference with the horizontal wells of the Longyi11 layer. Considering the upper gas layer, the Longyi14 minor layer is preferred as the target for three-dimensional development.  
(3) In view of the characteristics of the distribution of remaining reserves in the Weiyuan block production area, three-dimensional development can be adopted as a strategy for tapping potential and improving the degree of vertical utilization. On the basis of the original three wells of the H8 platform, the Longyi14 minor layer was selected as the upper target layer system, and the three-dimensional development mode of the \"\(M\)\" type well network was adopted to establish a three-dimensional development well model with five wells, a spacing of 400 m between planar wells, and a spacing of 200 m between horizontally projected wells in the upper and lower layers of the gas layer. The results show that the three-dimensional development program can increase the production of the platform by 1.76 \(\times\) 10\({}^{8}\) m\({}^{3}\), and the recovery factor grows from 16.4% to 31.0%, an overall improvement of 14.6%.  
Conceptualization, Y.L. and Y.W.; methodology, Y.L. and N.W.; software, J.Z.; validation, S.H. and M.Z.; formal analysis, W.N.; investigation, Y.L. and Y.W.; resources, Y.L. and W.N.; data curation, S.H.; writing--original draft preparation, S.H. and Y.L.; writing--review and editing, M.Z. and Y.W.; visualization, S.H.; supervision, Y.L. and Y.W. All authors have read and agreed to the published version of the manuscript.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.  
**Conflicts of Interest:** Authors [PERSON] and [PERSON] are employed by the Research Institute of Petroleum Exploration and Development; Author [PERSON] is employed by Research Institute of Petroleum Exploration and Development, Petro China Southwest Oil & Gas field Company. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.