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Gas Leakage from Palaeogene Reservoir in Assam - A Geophysical Puzzle


Affiliations
1 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, India
 

Reports of gas leakage started coming since the beginning of 2012 from different localities in the Deohal area near the oil township Duliajan, Assam (India). The source was located in a gas reservoir in the Palaeogene sediments (Barail group). Multi-component seismic reflection methods which were highly successful to locate gas bearing zones at depths, were not very effective to locate the same in the shallow subsurface. From different types of electrical surveys conducted, self-potential (SP) method showed the most promising result. Probable SP was sensitive to high electrokinetic potential difference between the leaking and non-leaking zones.

Keywords

Deohal, Electrokinetic Potential, Gas Leakage, Palaeogene.
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  • Gas Leakage from Palaeogene Reservoir in Assam - A Geophysical Puzzle

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Authors

Siddhartha Kumar Lahiri
Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, India
Monjit Chutia
Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, India
Anurag Gogoi
Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, India
Himanta Borgohain
Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, India

Abstract


Reports of gas leakage started coming since the beginning of 2012 from different localities in the Deohal area near the oil township Duliajan, Assam (India). The source was located in a gas reservoir in the Palaeogene sediments (Barail group). Multi-component seismic reflection methods which were highly successful to locate gas bearing zones at depths, were not very effective to locate the same in the shallow subsurface. From different types of electrical surveys conducted, self-potential (SP) method showed the most promising result. Probable SP was sensitive to high electrokinetic potential difference between the leaking and non-leaking zones.

Keywords


Deohal, Electrokinetic Potential, Gas Leakage, Palaeogene.

References





DOI: https://doi.org/10.18520/cs%2Fv111%2Fi7%2F1242-1246