Bengali petroleum-and-gas-bearing basin
BENGALI PETROLEUM-AND-GAS-BEARING BASIN (RU: Бенгальский нефтегазоносный бассейн) is situated on the territory of Bangladesh, India, and western part of Burma, within the lower reaches of the Ganges and Brahmaputra rivers (see the map). The area is 400 thousand square kilometres, of which 150 thousand square kilometres are accounted for the coastal shelf of the Bay of Bengal.
The first field has been discovered during the 1955, it is being developed since the 1958. There have been identified 15 gas fields (including one on the coastal shelf) and 5 petroleum fields, the initial industrial reserves of gas are 235 billion cubic metres, of petroleum are 0.6 million tonnes. The largest ones are: Titas (the industrial reserves are 110 billion cubic metres), Habiganj (36 billion cubic metres), and Bahrabad (35 billion cubic metres).
The Bengali petroleum-and-gas-bearing basin is confined to the Western-Bengali slope of the pre-Cambrian Hindustani craton and to the Bengali foredeep. The fields are associated with the local uplifts of the foredeep, there are productive the Lower Miocene sandstones. The gas contains 95-99% of methane. During the 1980, the annual marketable extraction of gas has amounted to 1.4 billion cubic metres, the total extraction has amounted to 1.6 billion cubic metres; the accumulated total extraction by the 1981 has amounted to 10.4 billion cubic metres. The gas pipelines are the Sylhet-Titas-Dhaka, Titas-Chittagong. The major centres of extraction of the gas are: Sylhet, Chatak, Habiganj, Titas.
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