Over the years, triaxial induction tools have found applications in not only determining resistivity anisotropy and dip of formations, but also in detecting fractures. When fractures are developed in a formation, the formation can exhibit triaxially anisotropic conductivity. This is particularly true for transversely isotropic formations. Direct modeling of tool response to the presence of fractures can be time-consuming, and therefore is impractical. A triaxially anisotropic model is an effective alternative, and has been used since the 1990s. We present a new approach for the simulation of triaxial induction tool response in a planarly layered and triaxially anisotropic formation. In the model, the three principal axes of anisotropy can be oriented in an arbitrary direction, and the orientation can change from layer to layer. By using the Fourier transform, the simulation becomes the computation of propagation of two types of plane waves that are coupled in the layered formation. A 2×2 reflection matrix is adopted to efficiently account for the reflection and transmission of the two plane waves in the layered formation. We introduce this new approach and present simulation results showing the strong influence of anisotropy orientation on the response of a triaxial induction tool in layered formations.
Presentation Date: Wednesday, October 17, 2018
Start Time: 9:20:00 AM
Location: Poster Station 9
Presentation Type: Poster
