Statistical Analysis of Geothermal Data of an Oil Field, in Parts of Niger Delta, Nigeria
Emujakporue Godwin Omokenu and Leonard I. Nwosu
DOI : 10.3844/ajgsp.2016.91.97
American Journal of Geoscience
Volume 6, Issue 2
Geothermal gradient and heat flow were computed from bottomhole temperatures in an oil field in Niger Delta, Nigeria. The statisticalanalysis of computed geothermal data was carried out. The computed geothermalgradient vary from 17.3±0.14 to 24.33±0.70°C/Km with an average of 22.24±0.57°C/km.The heat flow ranges from 38.06±0.31 to 56.39±2.41 mWm-2 with an average of 50.15±1.25mWm-2. The computed variance of the geothermal gradient and heatflow are 0.499 and 2.447 respectively. The standard deviation for thegeothermal gradient and heat flow are also 0.79 and 1.564. The values of thegeothermal gradient and heat flow are low in the south and high in the northernparts of the field. The geothermal values increase towards the north. Thepossible causes of geothermal anomalies are variation in thermal conductivity,presents of geological structures such as growth faults and rollover anticlinesand movement of fluid in the subsurface. The least geothermal gradient and heatflow values occur in the edge of the south east region. The region with highheat flow may be attributed to low sedimentary thickness while area with lowheat flow may be associated with high sedimentary thickness. The geothermalanalysis shows that the sediments in the area has attained hydrocarbongeneration stage of temperature interval of150 to 300°F (65 to 150°C). In the concept of the hydrocarbon-liquid window, the depth range withinwhich liquid hydrocarbons are likely to be present is 1550-4500 m.
© 2016 Emujakporue Godwin Omokenu and Leonard I. Nwosu. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.