A numerical simulation study on array acoustic logging of fractured granite reservoirs in buried hills
The buried-hill reservoirs in the Qiongdongnan Basin of the South China Sea exhibit intricate reservoir spaces and numerous fractures,leading to their pronounced heterogeneity.Since granite sediments spread across the study area,it is critical to effectively evaluate the development of fractures in granite reservoirs.Based on the COMSOL Multiphysics software and the finite element method,this study simulated the use of array acoustic logging to detect granite reservoirs with different widths,dip angles,and lengths,summa-rizing the response characteristics of fractures in different development states.The results are as follows:(1)Shear waves in fractured formations are subjected to non-significant influence of fracture widths,and their attenuation is inversely proportional to fracture dip an-gles and directly proportional to fracture lengths;(2)Stoneley waves manifest significant response to the changes in fracture widths,dip angles,and lengths,and their attenuation is proportional to both fracture widths and dip angles;(3)The attenuation of Stoneley waves is directly proportional to fracture lengths below 0.1 m but shows subtle response to fracture lengths above 0.1 m.The results of this study provide a basis for determining the development state of fractures in granite reservoirs using the array acoustic log method.
万方数据
维普
