Abstract: The aim of this study was to simulate the radioactivity of the crustal rocks of the Niger delta sedimentary basin using analytic solutions of the heat conduction equation and the method of least squares regression analysis for an earth model with radiogenic heat generation. The radiogenic heat generation capacity of the rocks was estimated using data from twenty six exploratory wells in the basin with assumption of a homogeneous earth. Radiogenic heat production per unit thermal conductivity ranged from as low as 0.0000014 to 0.004 μ°C m-2 with mean radiogenic heat production per unit thermal conductivity of 0.0006 μ°Cm-2. Percentage radiogenic heat production calculations revealed that radiogenic heat contribution is between 0.0002 and 0.6% of the overall surface heat flow density for the Niger Delta. Mean percentage radiogenic heat production of about 0.1% was obtained. Fraction of surface heat flow contributed by radiogenic heat generation per unit thermal conductivity was in the range of 0.0001 to 0.144 m°C m-1. Radiogenic heat production in the region was observed to be too small to have any significant effect on the thermal parameters of the region and as a result may not be included in thermal models of the basin. The low radiogenic heat generation obtained in this study agrees with the low mean heat generation values for amphibolites rocks.