Geochemistry of Gas and Condensate in the Surma Basin, Bangladesh

The Surma basin, which contains very thick Cenozoic sediments more than 20km, produces more than 95% of gases and condensates in Bangladesh. The producing reservoirs of gases and condensates are fluvial deltaic to estuarine sandstones in the Middle to Late Miocene Bokabil and Bhuban Formations of the Surma Group, which are located below the regional seal in anticlinal structures formed in the late Pliocene and Pleistocene age. To understand the petroleum system in the Surma basin more clearly, we performed geochemical analysis for condensate and gas samples which are taken from wells in the major fields in the Surma basin.