A new structural cooperative inversion approach applied to the combined tomography of electrical resistivity and seismic refraction travel times.

Kevin Samyn (1) , Adnand Bitri (1) , Roger Guerin (2)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 SISYPHE - Structure et fonctionnement des systèmes hydriques continentaux

We present a new cooperative inversion approach that allows for a combined inversion of independent physical parameters by exchanging structural information. The technique is based on an iterative cluster analysis step using a Fuzzy c-Mean technique (FCM). Cluster analysis aims at identifying groups of similar objects, and helps to discover distribution of patterns and interesting correlations in data sets. An occurring specific pattern of one parameter facilitates the development of coherent structure in the other using a reference model term in the least square solution associated to the linearized minimization of the cost function problem. In the presence of structures that can be seen by both methods it leads to sharp contrasted models. The technique is applied to the inversion of electrical resistivity and seismic refraction travel times. Two synthetic co-located data sets show how different structures are resolved with and without structural cooperative inversion. It is discussed how the quality of the inversion results is improved by the new approach.

Domaines: Géophysique [physics.geo-ph]; Géophysique [physics.geo-ph]; Milieux et Changements globaux

Kevin Samyn, Adnand Bitri, Roger Guerin. A new structural cooperative inversion approach applied to the combined tomography of electrical resistivity and seismic refraction travel times.. EAGE Near Surface Geoscience 2014, Sep 2014, Athènes, Greece. 4 p. ⟨hal-01025225⟩