An integrated approach for subsurface opportunity mapping in a mature gas field, Assam, India

The Duarmara field, which is situated in the Assam-Arakan Basin of Northeast India, was discovered in 1970 (in three wells) using 2D seismic data, which showed gas and condensate. Geological, petrophysical, and geophysical processes are integrated to create a thorough understanding of the subsurface, which is necessary for opportunity creation in this field. The present study describes a multidisciplinary method that integrates these three areas to more accurately and safely locate and assess hydrocarbon opportunities. Although the structural and stratigraphic foundation is established by the geological workflow, petrophysical analysis uses Vshale, porosity (Phie), permeability, and saturation assessment (Sw and So) to offer quantitative insights into reservoir quality. Potential hydrocarbon indications are found and reservoir geometry is improved by geophysical interpretation, which includes seismic inversion, AVO, and attribute analysis. Risk-based opportunity ranking, volumetric estimation, and robust static modelling are all supported by the integration of these datasets. This process improves field development tactics in intricate subsurface settings, facilitates data