New 2D Regional Multi-client Survey in East Africa, West Indian Ocean

Posted On June 12th, 2019 - 11:50 am | by Oil and gas press

As industry interest in hydrocarbon exploration offshore East Africa increases, attention is turning to frontier areas in the region such as the West Indian Ocean. At first glance, this area looks like a barren oceanic crust with little potential, but there is tantalising evidence to suggest otherwise.

CGG geoscientists have been sifting through the evidence to re-evaluate opportunities offshore East Africa and in the West Indian Ocean.

The best indication that a marine frontier region has exploration potential is the presence of continental crust, where there is an opportunity for working petroleum systems to develop in thick sedimentary basins. In this setting, the best chance for continental crust is the occurrence of micro-continents.

Legacy geophysical and geological data suggest that oceanic crust is pervasive throughout the West Indian Ocean, forming the Comoros and Glorioso Islands, Mauritius and much of the submarine ridge between Mauritius and the Seychelles. However, a number of recent investigations show overwhelming evidence for the existence of slivers of continental crust in the West Indian Ocean.

An example of a micro-continent in this region is the Seychelles Bank, where exploration wells drilled in 1981, about 120 km west of the main islands, proved the presence of a working petroleum system with oil shows and a mature Lower-Middle Jurassic source rock.

Robertson Plate Kinematics reconstruction models of the West Indian Ocean show the complexity of the poly-phased break-up of Gondwana, and suggest that there may be many more continental fragments similar to the Seychelles Bank scattered over the region.

Source / More : CGG

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