Abstract
The Mangala Field located in the northern Barmer Basin, Rajasthan, India is a Tertiary rift basin, comprising predominantly of Paleocene-Eocene sediments. The main reservoir unit in the Field is the Fatehgarh Group consisting of inter-bedded sands and shales with overlying Barmer Hill Clay-stone. Five reservoir units are recognized in the Mangala Field, named FM1-FM5 from the top downwards. About 45% of stock tank oil in place is contained within the FM1 member. To understand the lateral connectivity of these thin FM1 sands , Geo-body extraction was done by retaining the trough values considering them as sands. In contrast to other FM1 sands, the Top sand that is at an interface between overlying soft shales and Fatehgarh shales/sands is a peak and so was lost in extraction process. To get these Top sand Geo-bodies, a customized seismic characterization methodology was adopted. Geobodies were extracted retaining Peak values and amplitude cut off was applied to discriminate shales and sands based on Rock Physics analysis. Reasonable correlation between seismic response and wells was observed with the optimal cutoff. Extracted geobodies were merged with the existing geobodies and were used as a soft constraint during facies modeling in the static model.
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