Gas chimney processing was performed on a 2D seismic data acquired over a large area of the deepwater of Southern Tanzania. The purpose of the study was to determine the potential of the area for oil or gas production, prioritize areas for exploration, and understand the petroleum system better. The study area is immediately east of major gas discoveries in Cretaceous and Paleogene deepwater sands. It is also on trend with major Oligocene to Cretaceous gas discoveries in the Rovuma Basin of Mozambique. The results of gas chimney processing indicate a deep gas-prone source rock is charging the prospective Cretaceous reservoir objectives in the inboard part of the study area. Some hydrocarbon migration may also be occurring in the outboard half grabens. Secondary migration is focused on structural highs and provides charge to the objective Paleogene reservoir interval. Shallow migration terminates in the Late Miocene to Late Pliocene, related to the latest tectonic movement. Both migration modeling and gas chimney processing indicate little hydrocarbon seepage has occurred over the last million years, especially in the outboard portion of the study area. While the deep inboard parts of the basin are gas-prone, the shallower outboard half-grabens may still contain liquid hydrocarbons.


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