P - 607 Mangala Field High Density 3D Seismic Joseph Shiju 1 , Graham Bowyer 2 , Michael Micenko 3 1 Cairn India Limited, 2 Bowyer Seismic Consulting Ltd, 3 Mick Micenko Exploration Pty Ltd Introduction The world class Mangala Oil Field was discovered in the northern Barmer Basin of Rajasthan state, India in January 2004 (Figure 1). Following the drilling of 6 appraisal wells, 3D seismic acquisition and major data gathering efforts in 2004 Mangala was confirmed as the largest oil discovery in India since 1985. Development drilling is planned to commence in 2008. The Mangala structure is one of a series of simple, tilted fault blocks, bounded to the north and west by intersecting perpendicular faults with strong dip closure to the south east (Figure 2). The depth to the crest of the Mangala structure at the Fatehgarh reservoir level is about 600mSS. The main reservoir unit in the Mangala Field is the Fatehgarh Group, consisting of interbedded sands and shales. The Fatehgarh Group has been sub- divided into the Lower Fatehgarh Formation dominated by well-connected sheet flood and braided channel sands, and the Upper Fatehgarh Formation dominated by sinuous, meandering, fluvial channel sands. Although the structure of Mangala is relatively simple the seismic imaging is relatively poor at the crest of the structure due to shallow geological variations.