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Danna field is an oil field located in Niger Delta, Nigeria and the study was aimed at reservoir evaluation of the field using 3D seismic interpretation and petrophysical analysis. Five wells were correlated across the field to delineate the lithology and establish the continuity of reservoir sands as well as the general stratigraphy of the area. The petrophysical analysis carried out on the sand bodies indicates three sand units that are hydrocarbon bearing reservoirs (Sand J, Sand M and Sand P). These sand units were further evaluated using seismic interpretation. Time and depth structural maps were generated from seismic data to study the field's subsurface structures serving as traps to hydrocarbon and estimate the prospect area of the reservoirs in acres. Parameters such as net pay, water saturation and porosity i.e. derived from well logs together with estimated prospect area as obtained from seismic interpretation were used to compute the field's hydrocarbon reserve. Its gas reserve was estimated to be 225,997 bbl/ft³ while the oil reserve for the three reservoirs (Sand J, Sand M and Sand P) is computed as 6,566,089.09bb/acre, 14,006,716bbl/acre and 42,746, 580bb/acre respectively. [ABSTRACT FROM AUTHOR]