Dhirubhai Discovery—Largest Discovery in 2002
Ross, Steven P.1,
Reliance Exploration and Production discovered Dhirubhai A & B, the largest new field of 2002, in deep
water (1000+ m) off the Godavari Delta, east coast
The Dhirubhai fields were discovered using a coarse grid of 2D seismic data and a focused 3D exploration survey. Channel-belt reservoirs are imaged as amplitude anomalies, whereas levees show no unique amplitude character and are thin, poor-quality reservoirs. High-impedance corresponds to reservoirs of coarse-grained sandstone with rare conglomerate. Low-impedance exemplifies two reservoir types: 1) thick, well-sorted, coarse- to medium-grained sandstone; and 2) thick sections of interbedded, well-sorted, medium- to fine-grained sandstone and shale.
Over 100 km2 of the channel system is charged. Channel belts served as the carrier beds as well as, the reservoir. Slope shales form the updip seal and the top seal consists of finegrained Pliocene highstand deposits.