Abstract

Hydrocarbon exploration in Thanjavur sub-basin of Cauvery basin has been hither-to, pursued on a broad horst-graben model, with so-called highs or horsts as major exploration targets. Recent developments in studies on half-graben rift basins, however, demand a re-look into the exploration modeling of these basins worldover. An exercise involving simple review of available (mainly old 2D and some 3D) seismic data and flattening of seismic horizons was pursued using an equally simple exploration model involving halfgraben rift structural geometry / depositional set-up with attendant short depositional system. Fan-deltas, typical of short depositional system within fault-controlled hanging wall scarps are envisaged as main exploration targets to unravel the true potential of the basin with its implications on adjacent onland and offshore areas including the deep-waters.