Inversion of marine controlled-source electromagnetic (CSEM) data that have been sorted into common mid-point gathers can give an estimate of the resistivity section below a towline The method is fast and requires relatively small computer resources even for a Levenbeig-Marquardt optimization scheme However, it is not a standalone method- Proper 3D modelling with quantitative error analysis is used in a post-inversion step to refine the resistivity model. We demonstrate how inversion of common mid-point gathers can be used in combination with post-inversion modelling to improve the interpretation of a marine CSEM profile from South-East Asia Two resistors are identified on the section, and the deeper one is a confirmed gas accumulation in Upper Miocene turbidites.
展开▼
