Abstract

Daman Formation of Late Oligocene age in TaptiDaman block of Western Offshore Basin, India has prolific gas reserves. In the current study area of B-12 /C-26 field, Daman Fm. is characterized by dominant well developed multi-stack sands (Sand 10 to 60 packs) with thin shale interbeds and occasional limestone. Within Daman formation, Sand-30 and Sand-40 are the main gas producers. Till now, sand geometries and HC distribution are characterized by RMS amplitude, extracted from seismic far angle stack data, which have been found to be HC bearing in more than 80% of the drilled wells. However, for further de-risking and improved characterization of reservoir sands, rock physics analysis of individual pay sands and Pre-stack seismic inversion have been carried out. Horizon guided attributes maps viz. Minimum Vp/Vs and Minimum Lambda-Rho have been generated for the individual pay sands; which corroborates with HC distribution in all the drilled wells. The generated attribute maps further provides locales for exploration of Daman Sands (Sand-30 & Sand-40) with very higher degree of certainty.