Evaluation and engineering applications of the in situ stress state of deep tight sandstone reservoirs in the Xujiahe Formation of the Yingshan-Longgang in the central Sichuan Basin

Introduction: The Xujiahe Formation in the Yingshan-Longgang area of Sichuan Basin has abundant tight oil and gas resources. However, complex geological conditions insufficient understanding magnitude direction in-situ stresses severely limit exploration development resources region. This made it difficult to carry out hydraulic fracturing horizontal well deployment Methods: Based on experimental analyses, including acoustic emission experiments, wave velocity anisotropy paleomagnetic this study evaluated stresses, while also combining electrical imaging logging data. provides a basis for research area. Results Discussion: results indicate that three-way stress state is strike-slip state, value gradually increases with increasing burial depth. Longgang particularly affected by average azimuth angle maximum principal N100°E, tectonic deformation may cause counterclockwise deviation Yingshan Considering influence changes situ longitudinal extension mode, recommended select middle upper sections Xu II transformation. Similarly, considering distribution natural fractures suggested wells be between N20°–30°E.