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Pyrex Journal of Geology and Mining Research (PJGMR)

November 2015 Vol. 1(1), pp. 001-006

Copyright 2015 Pyrex Journals




Original Research Article


Some Aspects of the Petroleum Geochemistry of Tarsand Deposits in Western Nigeria


V.A. Ndukwe*, B.O. Ogunyinka and S. Abrakasa

Department of Geology, University of Port Harcourt, Rivers State, Nigeria

Corresponding Author E-mail: bikerplus2000@yahoo.com

Accepted 15th October, 2015



Abstract


The Nigerian tarsand is majorly found in the Western part of Nigeria, the deposits spans a distance of about 120km, the tar deposits occur as heavy oil and manifest as seepages at near surface or on the surface and as impregnated sediments at road cuts, cliff faces and river banks and at break of slopes. Samples were collected at Agbabu, Ilubinrin and Loda where open mining is in progress. The asphaltene content was determined and the concentration of a suite of trace metals, mainly the biophiles were determined. The GC‒FID (Saturates and Aromatic hydrocarbons) were examined. The objective of this study is to determine the genetic relationship of the tarsand. The results indicate that the sample (A1) obtained from the drilled wellbore showed an outstanding difference from others. The seep samples (A2, A3, A4, and A6) irrespective of the locations showed a close relationship as represented by the ternary plot. Samples with significant sand content (5, 7) also showed similarity. It is suggested that since the samples (A2, A3, A4, and A6) were seeped, they could have migrated via structural permeability e.g. faults and fractures, while samples 5, 7 could have migrated via a pore network in the trapless reservoir sandbody. The % Asphaltene versus Co/Ni ratio and Pr/Ph versus Pr+Ph/ (nC17+nC18) plots discriminates the samples into families.

Keywords: Genetic origins, petroleum geochemistry, tarsand, trace metals.

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