Research On Forward Modeling Of Fracture Space Orientation In Hydraulic Fracturing Based On Electromagnetic Method

Accurate monitoring of hydraulic fracturing fracture morphology is of great significance to the follow-up exploration and development work.Electromagnetic fracture monitoring can effectively identify the EPV(Effective Propped Volume)of fracturing fracture,and can make up for the shortcomings of other monitoring methods.This paper introduces a modeling method and physical model based on VLF(very low frequency)electromagnetic scattering theory for monitoring the development of asymmetric fracturing fractures.The 3D-FEM(three-dimensional finite element method)of equivalent fracturing fracture on TBC(Transition boundary condition)surface can be used to realize the fast forward modeling of three-dimensional space receiving response in large formations.In addition,based on the TBC equivalent fast fracture calculation method,a preliminary asymmetric sector antenna receiver is designed to solve the problem of asymmetric fracture development.The development direction and inclination of electromagnetic receiving signals and asymmetric fractures are discussed.The relationship between angular and azimuth parameters.By analyzing the three-dimensional electromagnetic signals obtained from the rotating receiver sector,the spatial state of multiple asymmetric fracturing fractures can be determined.It is proved that symmetrical fracture can be detected and identified,which provides a theoretical reference for the development of detection instruments,structural optimization and inversion.