Delineation of Fractures through Acoustic Televiewer Log
Authors
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CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
K. N. S. S. S. Srinivas -
CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
M. Srihari Rao
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CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
P. Pavan Kishore
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CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
D. Gopinadh
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CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
Haris Raza
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CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
Kusumita Arora
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CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
H. V. S. Satyanarayana
DOI:
https://doi.org/10.1007/s12594-018-0906-xAbstract
Boreholes are the only sources for direct measurements of geological and geophysical characteristics of the shallow subsurface of the earth. Borehole imaging tool "Acoustic Televiewer (ATV)" is an advanced probe, which records 3D image of the bore hole wall and is used to obtain oriented images of bore hole and provides substantial information regarding lithology, structural information, detection of fractures and casing of the borehole. The images are highly sensitive to the presence of fractures, the delineation of which becomes accurate and reliable based on these acoustic images. Features identified on log-derived images can be correlated with core samples or can be used as substitute in the poor core recovery zones. In the present study, ATV log from a deep borehole drilled at Khadi Kolavan in Koyna-Warna region of Ratnagiri district, Maharashtra located west of the Western Ghat escarpment in the Deccan Volcanic province, India, is used for interpretation of structural characteristics of the formation. The same was correlated with other conventional logging methods such as resistivity and full waveform sonic (FWS) as well as core logging and rock quality designations (RQD) which generated new understanding of the basement and basalt cover in this region.
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