Effects of Vertical Anisotropy on Marine Active Source Electromagnetic Data and Inversions

E026 EFFECTS OF VERTICAL ANISOTROPY ON MARINE ACTIVE SOURCE ELECTROMAGNETIC DATA AND INVERSIONS Abstract 1 Recently much effort has been focused on the interpretation of marine controlled-source electromagnetic data for hydrocarbon detection. Of particular importance is the nature of resistivity anisotropy in horizontally-layered sedimentary sequences as this can have a profound effect on recorded electric fields and subsequent data interpretations. In this paper we investigate the effects of vertical anisotropy and demonstrate that recorded electric field amplitudes increase dramatically with increasing subsurface anisotropy. We also show that electrical anisotropy in the overburden has a much greater effect on surface measurements