Abstract

Upper Assam Basin, situated in north-east part of India is a proven sedimentary basin and several hydrocarbon fields are discovered historically in this region. The study area is in central basement high over a mature field (Figure-01) and producing hydrocarbon primarily from Oligocene (Barail) & Lower Tipam (Early Miocene) formations. In recent past, few prospects are discovered in shallower formations i.e. Upper Tipam (Mid Miocene) and indications of hydrocarbon presence is seen in Girujan (Late Miocene) formation as well. However, sand connectivity and extension of these thin discrete reservoirs is not well known. Static model building & volumetric calculations for these reservoirs requires quantitative estimation of key reservoir properties viz. shale volume (VCLAY), effective porosity (?EFF) and water saturation (SW).