The Tight Reservoir Fracture Of Qixia Formation In Shuangyushi Area,sichuan Provinceseam Prediction

Qixia Formation gas reservoir in Shuangyushi area,northwest Sichuan basin has great exploration and development potential and is an important field for accelerating gas accumulation and production in sichuan Basin.The Qixia Formation is a typical fracture-reformed tight reservoir,which has undergone multi-stage tectonism and widely developed structural fractures.Therefore,the fracture prediction and exploration of the fracture development model of The Qixia Formation is of great significance to the same type of tight reservoir.In order to explore the fracture development mode,it is an experiment to design the physical simulation of structural fractures based on the tectonic evolution history of Qixia Formation.Through the experiment,kaolin 1 is determined as the best simulated formation material:1 mixing emery,this material has the deformation regularity in the process of extrusion experiment,near fault fracture,the similar fracture occurrence,directional arrangement,has the characteristics such as regularity,and use this material for structural fracture physical simulation experiment,the fault simulation-fracture development model,summarizes the development rule of the cracks and certification to subsequent fracture prediction result.In terms of fracture prediction,small and medium fractures are predicted based on actual pre-stack azimuth data.According to the overall strike of the fault,the azimuth division scheme is designed,and the fracture is predicted by the method of partial azimuth superposition.This method can judge the anisotropy intensity and the strongest direction,and then identify the fracture development intensity and fracture direction.It is not reliable to rely on only one method for fracture prediction.In this paper,prestack amplitude azimuth-anisotropic inversion fracture prediction(AVAZ)method will be adopted,and the results of the two prediction methods will be verified to make the fracture prediction results more accurate.In this paper,based on the analysis of the geological and structural background in the Shuangyushi area in northwestern Sichuan,combined with the results of fracture prediction,fault identification results,and the results of tectonic fracture simulation experiments,it is proved that the fracture prediction results are accurate and credible.It provides a certain basis for subsequent reservoir exploration and development.