Abstract

Interpretation of sand and shale in Olpad Formation of Padra field, Cambay Basin is quite difficult mainly due to intermixing of clastics with trapwash material. A methodology was adopted in the present study for delineating Hydrocarbon sand by thorough study of Pre-stack Stochastic inversion and its outputs like acoustic (P) impedance and Vp/Vs. Validation of the wells (producing and non-producing) were carried out meticulously. Several Cross plots were generated to study the behavior of the Olpad pay levels saturated with hydrocarbon and devoid of hydrocarbon. Behaviour of acoustic (P) impedance and Vp/Vs have been studied in hydrocarbon bearing and non-hydrocarbon bearing sands in the wells falling in the study area and it was observed that these two parameters (acoustic impedance and Vp/Vs) could discriminate between hydrocarbon and non-hydrocarbon zones.