Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Farah Deeba ¹, Delwar Hossain ²

Affiliations
1 Bangladesh Atomic Energy Commission, BSMEC, Cox's Bazar-4700, BD
2 Department of Geological Sciences, Jahangirnagar University, Savar, Dhaka- 1342, BD

Abstract

The Beani Bazar structure is located along the eastern margin of the Surma basin, Bangladesh. This paper presents the results of interpretation of seismic and well data from this structure. Based on the analysis of seismic data and their corelation with well information, seven reflecting horizons could have been identifed, viz top of the Bhuban Formation (Middle Miocene), the lower gas sand, the upper gas sand, the Bokabil Formation (Upper Miocene), the Tipam Sandstone Formation, the Girujan Clay Formation and the Dupi Tila Formation (Plio-Pleistocene). Structural analysis shows that the Beani Bazar is a N-S trending unfaulted anticlinal structure with eastern flank slightly steeper than the western one. The gas producing sands of the Beani Bazar structure belong to Bokabil Formation. The seismostratigraphic study of this area allows to resolve all the formations in the section.

Keywords

Subsurface Mapping, Seismic Data, Stratigraphy, Beani Bazar Structure, Surma Basin, Bangladesh.

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Abu Sohel Md. Shamaun Kabir ¹, Delwar Hossain ²

Affiliations
1 Geophysical Division, Bangladesh Petroleum Exploration and Production Company Ltd.(BAPEX), 10^th Floor, Shahjalal Tower, 80/A-B, Siddeshwari Circular Road, Dhaka-1217, BD
2 Department of Geological Sciences, Jahangirnagar University, Savar, Dhaka-1342, BD

Abstract

The Rashidpur structure is located in the southern part of the Surma Basin, Bangladesh. This paper presents an integrated interpretation of seismic and other geophysical data considering the available geologic information in terms of hydrocarbon potential of this structure. The study area lies within a gravity high and a high magnetic intensity. Fifteen seismic sections of the study area have been analyzed to interpret the subsurface geology, structure and stratigraphy. Based on the analysis of seismic sections and correlation with well data, four prominent reflecting horizons have been identified. The litho-stratigraphy of the Rashidpur structure is prepared on the basis of well information. The lithological sequences encountered in the Rashidpur structure range in age from Miocene to Plio-Pliestocene. The gas producing sands of the structure are within Bokabil to Bhuban Formations of the Miocene age. The seismic study indicates that the Rashidpur structure is a narrow, NS elongated anticline affected by a major reverse fault on the eastern flank. It is an asymmetrical anticline with the axis swinging slightly to the east on the northern plunge and thus attaining a slight concavity to the east. There are various geophysical indications of hydrocarbons in this structure.

Keywords

Geophysics, Rashidpur Structure, Surma Basin, Bangladesh.

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A. S. M. Shamaun Kabir ¹, Delwar Hossain ², Rashed Abdullah ²

Affiliations
1 Bangladesh Petroleum Exploration and Production Company Ltd., (BAPEX), Dhaka - 1217, BD
2 Department of Geological Sciences, Jahangirnagar University, Dhaka - 1342, BD

Abstract

Electrical imaging or electrical tomography is a survey technique suitable for the investigation of areas of shallow complex geology, where the use of other electrical and electromagnetic techniques is less effective. An electrical image has been delineated at a site located in front of the Department of Geological Sciences, Jahangirnagar University, Dhaka, Bangladesh. 16 soil samples were collected from two boreholes located on the image line and geotechnical parameters such as unit weight, water content, grain size, plastic limit, liquid limit and plasticity index were measured in the laboratory. These geotechnical parameters were compared with the measured electrical resistivity.

Keywords

Electrical Tomography, Madhupur Clays, Bangladesh.

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