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The AAPG/Datapages Combined Publications Database

Southeast Asia Petroleum Exploration Society (SEAPEX)

Abstract


Offshore South East Asia Conference, 1978
Pages 133-135

New Aspects on the Oil and Gas Potential of the Bengal Basin (Bangladesh)

Jurgen Lietz, Jahangir Kabir

Abstract

Generally, deltas belong to those favourable depositional environments where liquid and/or gaseous hydrocarbons are sourced and accumulated in a great variety of structural and strati-graphic traps. As Previous HitfarNext Hit as the Bengal Basin is concerned, important gas fields have been discovered and exploited. But no oil has been found so Previous HitfarTop. This fact always gave rise to controversial opinions on the gas origin and with that, on the chance of finding oil at all.

The different opinions held are:

  1. The gas is an immature marsh or swamp gas with a maturity rank above the so called “oil window”. This would imply no chance for the generation of oil.

  2. The gas was generated together with oil but became separated during migration. This would still give the chance of finding oil.

  3. The gas is an overmature gas with a maturity rank below the oil window. This would mean that intensive cracking processes have destroyed liquid hydrocarbons.

  4. The gas is derived from woody kerogen. This would exclude the joint generation with oil.

It is quite obvious that a close inspection of these different theories regarding their validity is of great importance for any exploration on liquid (and gaseous) hydrocarbons. Therefore 13C/12C isotope analyses from different natural gas samples were carried out very recently in the Institute for Geosciences in Hannover (Federal Republic of Germany). The analysed gas samples are from the gas fields Chattak, Sylhet, Titas, Habiganj and Semutang.


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