Abstract

Here, we present results after processing of a 5.5 km long 2D seismic data set acquired in 2006 across the N-W offshore Sumatra subduction system where the Indo-Australian plate has been subducting below the Eurosian plate. This study suggests that the dewatering and dehydration of the subducting plate, and the landward compression associated with the subduction processes may have expelled out porefluid from the trench sediments, migrating updip along the frontal slope. The processed seismic section shows the possible path of the fluid migration and its accumulation at the anticline below the frontal slope. The reverse polarity with respect to sea floor and amplitude blanking observed in the migrated section and sudden decrease in 1D velocity profiles, further suggest that the accumulated fluid might be linked with a potential hydrocarbon reserve.