3D Bipolar Spectral Inversion Based on Structural Geosteering Shear Backfill Mapping

Conventional multichannel spectral inversion (SI) methods are usually implemented in a 2-D model, which only considers the lateral continuity inside a section and ignores the continuous features between sections in 3-D space. On the other hand, the principle of odd–even decomposition, which can significantly improve the thin-layer recognition ability, is poorly adapted in multichannel with complex structures. We propose a structural geosteering shear backfill mapping (SBM) method to alleviate these issues. After that, we establish a 3-D bipolar SI objective function based on structural geosteering SBM and solve it with 3-D norm regularization. Examples using synthetic and 3-D field data show that the 3-D bipolar SI based on structural geosteering SBM is highly adaptable to complex structures and can provide a better inversion result than the conventional multichannel sparse spike inversion in terms of guaranteeing strata continuities and retrieving weak reflectivity.