The Effect of Temperature on Hydrocarbon Types in Bara Oilfield, Niger Delta Basin, Gulf Of Guinea West Africa

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Author(s) Jonathan O. Omoboh | Prince .S. Momta | Francis T. Beka
Pages 430-440
Volume 4
Issue 9
Date September, 2015
Keywords Catagenesis, Metagenesis, Temperature, Kerogen, Geothermal Gradient
Abstract

This study tries to evaluate the role that temperature plays in the formation of either oil or gas in the Bara oilfield. Resistivity log was used to delineate hydrocarbon-bearing zones, and compared the existence of both liquid and gaseous hydrocarbon with the distribution of temperature and heat flow in the field. Hydrocarbon type refers to either liquid or gaseous hydrocarbon. Nearly all the hydrocarbon intervals in the studied wells have gas capping the oil. Temperature plays a significant role in the transformation of organic matter into the various types of hydrocarbon. The range of temperature that results in the formation of oil and gas or a mixture of the two has been established to be between 50oC to 200oC. The highest temperature of 115oC is recorded in well 4 which occurs towards the centre of the field where there is high geothermal gradient (up to 1.81 oC/100m), whereas the lowest temperature occurred in well 1 which also has the lowest temperature, lowest geothermal gradient with a corresponding low hydrocarbon presence. The occurrence of good quantity of gas in association with oil in the field suggests that the kerogen type is likely of equal proportion of type II and III which favour the formation of both oil and gas in the field.

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