Abstract

Integrated analysis of electrologs, sedimentology and 3D seismic data has been carried out bringing out the microfacies and porosity development within Middle-Late Eocene Bassein carbonates in DCS area of Mumbai Offshore basin. Litho-facies analysis shows mainly carbonate development in the study area along with mixed carbonate-clastic litho facies in the east. Sedimentological analysis indicates foraminiferal wackestone and packstone, foraminiferal algal grainstone and dolomitic wackestone microfacies for the Bassein carbonates. SEM studies indicate poor to fair porosity development represented by solution vugs, channels and often blocked by sparitisation. Petrophysical analysis indicates good porosity development at the top of both Bassein Upper and Lower in the southern part. Seismic inversion studies indicate poor to fair reser voir facies development in the north-eastern and fair to good in central part, and good reservoir facies in the south and south western part. The wedge out plays of Bassein Lower and Upper in the north-eastern part are likely to be promising exploratory targets for pursuing hydrocarbon exploration in this area