Abstract
Geochemical assessments of the Bengal Foredeep oils, condensates, and active surface seeps provide good evidence which permits the division of these hydrocarbons into two major groups. The first group comprises oils and condensates from the Sylhet Trough area, sourced from a mature-late mature ( R 0 ⩾ 0.9%) kerogen deposited in a deltaic environment with significant higher plant input. These reservoired hydrocarbons are pooled at a much shallower depth than they were sourced, and migrated a considerable distance vertically from source to reservoir. The second group, from the south of the Sylhet Trough, comprises oils and condensates which have been generated from a marine-influenced terrestrial kerogen at a much less mature ( R 0 ⩾ 0.7%) state than the first group. They accumulated in the Miocene reservoirs adjacent to the source rocks. It is apparent that reservoired hydrocarbons in these two groups originated from different source rocks.
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