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Gas-charged sediments in shallow waters off Redi along the central west coast of India
Ist Teil von
Current science (Bangalore), 1996-09, Vol.71 (5), p.416-419
Ort / Verlag
Current Science Association
Erscheinungsjahr
1996
Link zum Volltext
Quelle
Free E-Journal (出版社公開部分のみ）
Beschreibungen/Notizen
This study reports the occurrence of gas-charged sediments in the nearshore areas of the west coast of India. High resolution shallow seismic reflection profiles on the nearshore area along central west coast of India, at water depths of 11–18 m are characterized by anomalous seismic subbottom signatures in the form of acoustic turbidity which extends from the underlying reflector and reach within 4–5 m of the seafloor. Fine grained sediments apparently contain appreciable quantities of interstitial gas bubbles which are responsible for the anomalous seismic signatures. This could be due to shallow hydrocarbon gases, mostly methane, which might have been derived due to the biogenic degradation of organic matter accumulated under palaeo-estuarine conditions. These gas-charged sediments pose a potential hazard for the offshore engineering constructions. Hence, the detection of these sediments forms an essential part of any offshore site investigation programmes.