Abstract
Thermal conductivity estimates are computed from nineteen petroleum wells in the north-western Niger Delta,Nigeria, using a geometric mean model. Sonic and gamma-ray logs were digitised and used in the estimation of insitu conductivity. The Niger Delta is composed of three major diachronous lithostratigraphic units of shaly Akata,shaly-sandstone Agbada and sandy Benin formations, which form the bulk of the deltaic sediments. All the wellsused in the study could only penetrate the topmost Benin and the underlying Agbada formations, except Akatathat is the last deeply lying formation. Mineralogy, porosity and lithology exert the most important control on thematrix thermal conductivity in the Niger Delta sedimentary basin. There is a decrease of thermal conductivitywith increasing shale fraction. The bulk conductivity also show an increase with increasing sandstone fraction.Increase in porosity results in a decrease in bulk conductivity. Thermal conductivity values and variations for agiven lithologic unit are reduced at increased porosity, such that thermal conductivity of the topmost continentalBenin sandstone Formation vary between 2.39W/m°C and 2.74W/m°C with an average of 2.52W/m°C. Thermalconductivity for the underlying, marine shaly-sandstone Agbada formation varies between 2.16W/m°C and2.69W/m°C with an average of 2.33W/m°C.
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