With gradual depletion of oil reserves in the continental part of the earth and to cope with the increasing demands of present life there is no other option but to look towards the offshore oil potentials. Remote sensing and GIS technology appear to be the most suitable, reliable and economic technique for a reconnaissance survey, particularly in the offshore region which is otherwise inaccessible. In the present study ENVISAT ASAR and ERS image data have been used to delineate potential oil bearing zones for further detailed exploration in the Mahanadi offshore basin. At first, the oil seepages are identified from the images and are plotted on a georeferenced map in GIS environment. Then the oil seepages are differentiated from the pollution slicks coming out of moving ships or tankers and the biogenic slicks formed due to algal material. After discarding the aforesaid noise slicks the natural oil seepages are analysed on the basis of shape, size and repetitiveness with time. Finally the identified natural seepages have been correlated with major tectonic features and structural elements such as basement faults and Cretaceous faults present underneath in the ocean floor which may provide avenues for the oil to reach the sea bed. A fairly good relationship is seen between the oil slicks and the faults. During this study some oil seepages in the deep offshore region are found to be associated with 85? E Ridge System situated underneath. Earlier workers suggested the 85? E Ridge to be showing positive magnetic anomaly of single polarity and negative free air gravity anomaly and the region may represent a continental sliver. The present study highlights the possibility that the 85? E Ridge is a potential zone for further exploration for petroleum.
Delineation of Possible Areas of Petroleum Exploration using ENVISAT ASAR and ERS Data in Mahanadi Offshore Basin, India and the Potential and Prospect of 85? E Ridge
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With gradual depletion of oil reserves in the continental part of the earth and to cope with the increasing demands of present life there is no other option but to look towards the offshore oil potentials. Remote sensing and GIS technology appear to be the most suitable, reliable and economic technique for a reconnaissance survey, particularly in the offshore region which is otherwise inaccessible. In the present study ENVISAT ASAR and ERS image data have been used to delineate potential oil bearing zones for further detailed exploration in the Mahanadi offshore basin. At first, the oil seepages are identified from the images and are plotted on a georeferenced map in GIS environment. Then the oil seepages are differentiated from the pollution slicks coming out of moving ships or tankers and the biogenic slicks formed due to algal material. After discarding the aforesaid noise slicks the natural oil seepages are analysed on the basis of shape, size and repetitiveness with time. Finally the identified natural seepages have been correlated with major tectonic features and structural elements such as basement faults and Cretaceous faults present underneath in the ocean floor which may provide avenues for the oil to reach the sea bed. A fairly good relationship is seen between the oil slicks and the faults. During this study some oil seepages in the deep offshore region are found to be associated with 85? E Ridge System situated underneath. Earlier workers suggested the 85? E Ridge to be showing positive magnetic anomaly of single polarity and negative free air gravity anomaly and the region may represent a continental sliver. The present study highlights the possibility that the 85? E Ridge is a potential zone for further exploration for petroleum.
Publication Mode |
Online |
---|---|
Publication Author |
Mahasweta Mahapatra, Samiran Mahapatra |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2016 |
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