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Deepwater Frontier Exploration Using Seismic and Seaseep Data, Indonesia: Implications for India

Peter Baillie1, John Decker2, Paul Gilleran1, Tanya Johnstone1, Dan Orange2, and Philip A. Teas2
1TGS-NOPEC Geophysical Company, West Perth, WA, Australia
2Black Gold Energy, Jakarta, Indonesia

Technologies developed for conventional marine hydrographic surveys and anti-submarine warfare have been recently been upgraded, modified, and integrated for offshore petroleum exploration, and in particular, deepwater (400-3,000m) exploration.

Very high resolution maps of the sea bottom and zones of oil and gas seepage may be identified using a vessel traveling at 10 knots and surveying a swath width of about 4 km. Similar advances in subsea positioning enable accurately-navigated piston-core to sample features identified on the sea-bottom. These cores can be subjected to modern geochemical analysis and locations of thermogenic hydrocarbon charge identified.

In December 2006, TGS-NOPEC commenced the world’s largest multibeam and the world’s first non-exclusive SeaSeep survey as part of an innovative exploration program in the offshore frontier basins of Indonesia.
SeaSeep data comprises:

1. Multibeam bathymetry and backscatter data to provide (a) 100% coverage of the sea-floor defining structural trends and modern offsets, (b) location and concentrations of hydrocarbon seeps, and (c) core locations;
2. Gravity and magnetic data to provide a regional grid of hi-res profiles to provide first order tectonic fabric and basement architecture and constrain basin thickness and geothermal gradients;
3. Navigated piston cores and geochemical analyses;
4. Heat-flow and geothermal gradient data.

The program will acquire a variety of data to conduct a comprehensive prospectivity analysis over an area of around one million square kilometers. The studies, involving some 30 sedimentary basins, will have available 35,000 km new 2D seismic data, 400,000 square kilometers of Multibeam SeaSeep data including 1,200 sediment cores, 3,600 geochemical analyses and 60 heat flow probes.

The presentation will utilise examples from the survey to discuss possible application offshore India.

Presentation GEO India Expo XXI, Noida, New Delhi, India 2008©AAPG Search and Discovery