Seismically Guided Inversion of Magnetotelluric, Gravity, and Magnetic Data in Yamagawa Geothermal Area, Japan

Abstract

In this paper we introduce 3D inversion technique for magnetotelluric (MT), gravity, and magnetic data, which incorporates seismic constraints. Reliable and reasonable 3D models of multiple physical properties, which can be recovered from 3D inversions of multiple geophysical data, are required to interpret complex geological structures appropriately. However, the geophysical inverse problem is ill-posed, i.e., non-unique and unstable, especially for the case of 3D problem. Appropriate a priori models or constraints can help solving this ill-posed problem. The developed technique can take into account the constraints based on seismic and well-log data. We have applied the developed method to the interpretation of MT, gravity, and magnetic data acquired in Yamagawa geothermal area, Japan. The results show that the developed method can recover more reliable and reasonable 3D models of multiple physical properties. Also, these results can help interpreting the complex geological structures in the survey area.

AAPG Datapages/Search and Discovery Article #90323 ©2018 AAPG Annual Convention and Exhibition, Salt Lake City, Utah, May 20-23, 2018