Lineament Mapping over Sir Creek Offshore and its Surroundings using High Resolution EGM2008 Gravity Data: An Integrated Derivative Approach
Authors
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Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad – 826 004
Ujjawal Kumar -
Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad – 826 004
S. K. Pal
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Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad – 826 004
Soumyashree Debasis Sahoo
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Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad – 826 004
Satya Narayan
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Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad – 826 004
Saurabh
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Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad – 826 004
Subhendu Mondal
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Geological Survey of India, Hyderabad - 500 068
Shuva Shankha Ganguli
DOI:
https://doi.org/10.1007/s12594-018-0922-xAbstract
The present study deals with the delineation of lineaments over Sir Creek offshore and its surroundings from EGM2008 gravity data using various derivative techniques owing to their cost effectiveness in prospective hydrocarbon exploration. Initially, 2- D and 3-D synthetic models have been generated with vertical prismatic objects at different depths. The effectiveness of total horizontal derivative (THD) technique has been established by comparing with E-W and N-S Horizontal derivatives and First Vertical derivative techniques. The residuals of Bouguer gravity data have been estimated with different cut-off wavelengths. Further, the residual anomaly map has been enhanced by the derivative techniques for the delineation of the structural features. Possible depths of the delineated lineaments have been estimated using Euler deconvolution of the Bouguer gravity data, which indicates maximum clustering over the delineated lineaments. It is observed that most of the lineaments are in the depth range of 1.0 km to 5.5km, which correlate well with the previous seismic studies. The present study reveals that the major lineament trends in the N-S, E-W and NNW-SSE directions followed by NE-SW, NW-SE and ENE-WSW directions. These major lineament trends are due to the tectonic activities occurred during Precambrian and Cretaceous period. Different small circular features, rectangular features and shorter wavelength features have also been identified, which could be the key parameter for mapping potential location for hydrocarbon exploration.
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