GEOTHERMAL PROPERTIES OF HYDROCARBON RESERVOIRS IN OML-63 FIELD IN THE NIGER DELTA BASIN, NIGERIA
Abstract
This research investigates the geothermal properties of hydrocarbon reservoirs in Tebidaba Field, OML 63 in the Niger Delta basin, Nigeria, using continuous temperature, gamma ray, neutron, density and resistivity log data. Techlog and Excel softwares were employed for data loading, analysis, and visualization of reservoir tops, and bases. The results showed that the reservoir thickness ranges between 18.24m and 45.06m with an average of net thickness of 37.74m. The temperature of the reservoirs ranges between 83.11 and 83.59oC with average reservoir temperature of 83.14oC. The geothermal gradient ranges between 12.62oC/km to 17.57oC/km with an average of 16.70oC/km. The thermal conductivity varies from 2.06Wm-1k-1 to 2.58Wm-1k-1 with an average of 2.43Wm-1k-1. Heatflow ranges from 32.56mWm-2 to 45.38mWm-2 with an average of 40.54mWm-2. The porosity of the reservoirs ranges between 28.54% and 38.90% with an average of 33.55%. Shale volume ranges from 0.50 to 0.63 with an average of 0.56 in the reservoir. The sand volume ranges between 0.37 and 0.50 with an average of 0.44. The results suggest that the hydrocarbon bearing sand reservoir has a favourable geothermal condition and highlights the influence of depth, porosity and lithology on the thermal characteristics of the reservoirs. The crossplots of temperature against depth and lithology validates the fact that temperature increases with depth as sand volume decreases, while shale volume increases with increasing depth. This study provides a new insight of the geothermal properties of hydrocarbon reservoirs in Tebidaba Field ( OML 63), which is crucial for evaluating reservoir productivity and exploitability.
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Published in SALEM JOURNAL OF HEALTH & ENVIRONMENTAL SCIENCES, ENTREPRENEURSHIP, ENGINEERING & AGRICULTURE
ISSN: 267-44669
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