Email: rahman72ru @yahoo.com
The Bengal Basin in the northeastern part of the Indian subcontinent contains the pre-Oligocene Surma Basin, a prime gas-producing province in northeast Bangladesh. The study area is tectonically very active, even though it is located in a passive margin setting. The Dauki Fault is the most important tectonic element. In the Surma valley, Archean basement has been downthrown about 18 km along this feature. Plate collision also affects the sedimentation pattern as well as basin architecture from time to time. The Tertiary sedimentary succession is well exposed in different parts of the study area.
The existing stratigraphic succession in the study area was proposed by Evan (1932), and was established on the basis of lithostratigraphic correlation with the neighboring Assam area in India. In the Evan stratigraphic scheme the boundary between the Surma and Tipam Groups is useable for correlation. However, the scheme is a little difficult to apply in the case of the contact between the Bhuban and Bhokabil Formations of the Surma Group, because the strata have more or less uniform lithology and are devoid of faunal evidence. Application of sequence stratigraphy is therefore needed to minimize the problems in comparison with the effects on spatial and temporal variations in tectonics, sediment supply and relative sea level fluctuations, to elucidate the development of the basin and sedimentary sequences.
Aim and objectives
I will carry out stratigraphic analysis through field observation, grain fabric mapping and petrological studies. Lithostratigraphic units will be correlated with similar successions in Assam, Nepal and Pakistan, which are also associated with Himalayan uplift. This study will contribute significantly to solving problems in stratigraphic interpretation, and hence the development and production of the hydrocarbon resources of Bangladesh.