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

Ranjit K. Banerji ¹, R. M. Baruah ², S. C. Gupta ²

Affiliations
1 Indian Institute of Technology, Bombay 400076, IN
2 Oil and Natural Gas Commission, Sibsagar, (Assam) 785640, IN

Abstract

The exploration for hydrocarbons in the Bengal Basin has revealed the development of nearly 100m of a highly fossiliferous subsurface sequence near Galsi in West Bengal. This sequence has yielded a large number of planktonic and benthonic foraminiferal species. In all, twenty-two species belonging to seven genera and three families of planktonic foraminifera are identified and described. Based on their stratigraphical distribution, four assemblage Zones are distinguished which range in age from Zone N.4 to N.14 (Aquitanian to Langhian, Early to Middle Miocene). The microfaunal study suggests an oscillatory nature of the depositional basin varying from coastal marginal facies to short intervals of open marine inter-tongues within overall shallow marginal basin.

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A. K. Das ¹, R. M. Baruah ¹, S. S. Bisht ¹, B. Agrawal ¹

Affiliations
1 Basin Studies Division, KDMIPE, ONGC, Dehradun-248195, IN

Abstract

Integration and analysis of all the available geoscientific data in Jabera-Damoh area of Son Valley, Vindhyan Basin have been carried out to evaluate hydrocarbon prospects. Taking lead from the rank exploratory well, time structural mapping over the area with the help of seismic data has established a southeasterly extension of Damoh structure, north of Jabera. The structure is bounded by two major NW-SE trending faults whereas ENE-WSW trending faults are more dominant in Jabera dome, in close proximity to the Son-Narmada Lineament. Tectonic inversion has affected Jabera structure mainly from Kajrahat Limestone member of Semri Group onwards. Seismic facies and interval velocity analysis supported by paleocurrent data suggest better development of reservoir facies towards north i.e. in the area around Damoh. Further exploratory efforts should be pursued by exploring Damoh structure and acquiring additional seismic data in the eastern and southwestern Part of this Category III basin.

Keywords

Hydrocarbon, Late Proterozoic, Vindhyan, Son Valley.

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