A New Fracturing Result Evaluation Method Based on Borehole Time-Domain Electromagnetic

With the extension of resource exploration to unconventional fields, fracturing reconstruction has become an important method to increase reservoir production and efficiency. Through theoretical research and numerical simulation calculation, this paper explores the fine evaluation technology of 3D fracture distribution near borehole by time-domain electromagnetic borehole based on three-component detection mode, and carries out numerical simulation of time-domain electromagnetic response characteristics of different detection modes, different fracturing fluids, different fracture distribution and other influential factors. The results show that the three-component time-domain electromagnetic ultra-remote detection method can better characterize the three-dimensional spatial fracture distribution in the range of 50 m near the well. The higher the contrast between fracturing fluid and formation resistivity, the more obvious the response characteristics of time-domain attenuation curve are. When the fracture cluster surface is parallel to the coil surface, the response characteristics of the time-domain attenuation curve are most obvious. The three-component time-domain electromagnetic can realize the remote borehole 3D geological information detection by using the short receiving and sending distance, which is conducive to reducing the engineering construction risk. From the contrast of geophysical detection, the change of electrical parameters caused by fracturing fluid is more obvious than the change of acoustic parameters, so the time-domain electromagnetic technology is more conducive to the fine characterization of 3D fracture body near the well after fracturing.