Tomographic Joint Inversion of Direct Arrivals, Primaries and Multiples for Monochannel Marine Surveys

Conventional multichannel surveys provide good images in 2D and 3D of the Earth depth, which are successfully used for oil gas industries. However, their cost environmental impact make them rarely affordable engineering applications, especially offshore infrastructures. In this case, monochannel systems, such as Boomers, having cables that a few-meters long, time-domain useful but miss relevant lithological information engineers, P-wave velocity shallow layers. paper, we present tomographic approach exploits multiple reflections, addition to primaries direct arrivals, work with short offset. It can detect lateral variations thickness first layer under sea floor. Two complementary algorithms compared: pure inversion, tuning exploiting classical Dix formula; one is more precise, while second robust respect noise. A two-step inversion incidence-angle parametrization performs slightly better than single-step algorithm based on traveltime inversion. We validate method by synthetic real data examples.