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27. ESTIMATIONS OF THERMAL CONDUCTIVITY, HEAT FLOW AND GEOTHERMAL GRADIENT OF SOME SELECTED WELLS IN THE NIGER DELTA. by Aigba P.I., Nwankwo C.N. and Dinneya O.C. Volume 50 (March, 2019 Issue)
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ESTIMATIONS OF THERMAL CONDUCTIVITY, HEAT FLOW AND GEOTHERMAL GRADIENT OF SOME SELECTED WELLS IN THE NIGER DELTA.


Aigba P.I., Nwankwo C.N. and Dinneya O.C.


Department of Physics, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria

Department of Physics, University of Port Harcourt, Choba, Rivers State, Nigeria.


Abstract


The estimations of thermal conductivity, heat flow and geothermal gradient of some selected wells in the Niger Delta were carried out in wells A, B and C of the Niger Delta. Bottom Hole Temperature (BHT) is unreliable as an input data for the estimations of allied parameters and thus was corrected using Horner correction plot. Logs were imported into Rokdoc from where Gamma ray log was used to delineate the lithology while the bulk density of each lithology was read from the Formation Density Log. In shale, such bulk density was corrected before obtaining porosity from it while a direct porosity was done in the case of sand. Water conductivity, bulk conductivity, heat flow and geothermal gradient were determined using appropriate models. Well A has a thermal conductivity ranging from 2.056 to 2.45 W/mK, its heat flow is between 0.051 and 0.061W/m2 in shale; in sand, its thermal conductivity has a range of 5.097 to 6.283W/mK, heat flow ranges from 0.033 to 0.042 W/m2 as its geothermal gradient was calculated to be 24.750C/km. Well B with an estimated geothermal gradient of 15.90C/km came down to a thermal conductivity range of 2.158 to 2.623W/mK, a heat flow range of between 0.034 and 0.041W/m2 in shale. Sand in this well has thermal conductivity of between 2.951 and 5.665W/mK while its heat flow ranges from 0.049 to 0.090W/m2. Well C in the same field with Well A has a calculated geothermal gradient of 24.780C/km; an estimated thermal conductivity of between 2.665 and 2.744W/mK and heat flow of between 0.065 and 0.068W/m2 in shale. In sand, a thermal conductivity of between 4.859 and 5.929W/mK, heat flow of between 0.120 and 0.147W/m2 were estimated. Mineral constituents and their transformation processes may influence thermal conductivity, heat flow and geothermal gradient, since all these depend on porosity of sediment as a driving force. An appropriate estimation of reservoir’s thermal conductivity is wholesomely salient for hydrocarbon maturation and basin’s thermal history qualitative assessment. Projection of temperature of deeper prospects is feasible with this study. 


Keywords: Temperature, thermal conductivity, heat flow, geothermal gradient, radiogenic process and porosity.

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