One-dimensional Geotemperature Modeling Using One-layer Model for Awa Oil Field, Niger Delta Sedimentary Basin, Nigeria Using One Layer Model

Abstract

In this research, one-dimensional steady state thermal structure in part of Niger Delta sedimentary basin has been modelled using one layer model. The solution to the Fourier one dimensional heat flow was used to generate geotherm the area. The model column is about 7.0 Km thick, has average thermal conductivity and radioactive heat generation of 2.5 Wm−1 C−1, and 2.0 µWm-3 respectively. Two boundary conditions; surface temperature and heat flow of 27oC and 50mWm2 were also used. The computed temperatures using the model increases with depth from earth surface to about 6500 metres. Beyond 6500 metres, the temperature starts decreasing with depth as a result of the quadratic nature of the model. The depth range within which the temperature increases with depth falls within the Benin and Agbada Formations of the Niger Delta. Comparison between the computed temperature and measured bottom hole temperature from three wells reveal a very good matched. The diference between computed and measured temperature ranges between -4.0 to 6.0°C. The thermal structure of the sedimentary basin is controlled by thermal conductivity and radiogenic heat production.