International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 9, September 2017

International Journal of Science and Technology


Application of Brine Concentrations as a Reconnaissance Geochemical Tool for Hydrocarbon Exploration: Case Study of Field “X”, OML63, Coastal Swamp 1 Depobelt, Niger Delta Basin, Nigeria.

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Author Ahiarakwem, C.A, Opara, A.I
On Pages 507-516
Volume No. 2
Issue No. 8
Issue Date August, 2012
Publishing Date August, 2012
Keywords Benzene Concentration, Brine, Geochemical Exploration, Niger Delta, Petroleum Accumulation.


Abstract

Analysis of benzene concentrations in brine samples obtained from two test wells in “Field X’’ in the Oil Mining Lease (OML) 63,Coastal Swamp I, Depobelt, Niger Delta, Nigeria was carried out with the objective of determining the possibility of using benzene concentrations in brine to confirm the approximate distance from a dry hole to a reservoir in the same hydro-geologic system by mapping the plume of dissolved petroleum constituents emanating from the nearby accumulations The concentrations of benzene in eight brine samples obtained from the study area were analyzed using photo-ionization detector gas chromatograph. The results revealed that the concentrations of benzene in the brine samples vary from 5.0 to 6.5 ppm (corresponding to a drill depth range of 700 to 1,000m) in test well 1, to 4.50-6.55ppm (corresponding to a drill depth of 600 to 1,020m) in test well 2. This amount of concentration of benzene revealed the presence of oil prospects below the test wells. The estimated distance from 1,000m (where the 5ppm of benzene was obtained) to the top of the oil prospect below is about 1.93km which implies a drill depth of approximately 2.93km from the surface to the top of the oil prospects. This estimated depth values are consistent with the depths to the top of oil kitchen in the Niger Delta Basin. These findings are indications that the analysis of benzene concentration can serve as a cost effective and reliable geochemical exploratory tool in the study area.

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