Investigation of Petroleum Source Rock Potential and Maturity in Pologbene-001 from resistivity and density logs, Northern Depobelt Eocene Deposits, Niger Delta, Nigeria by Benson Akinbode Olisa , Scientific Research Journal (Scirj), Volume VI, Issue VIII, August 2018 Edition

Scirj Volume VI, Issue VIII, August 2018 Edition
ISSN: 2201-2796

Investigation of Petroleum Source Rock Potential and Maturity in Pologbene-001 from resistivity and density logs, Northern Depobelt Eocene Deposits, Niger Delta, Nigeria

Benson Akinbode Olisa

Abstract: Petroleum source rock potential and maturity of Pologbene-001 in the Northern depobelt was investigated using Rock-Eval, resistivity and bulk density data. The Rock-Eval data was used to select Eocene age. TOC was calculated from gamma ray (GR) curve to determine the TOC variation in shale sections. The source rock potential was further investigated using the density and resistivity data. These studies were done to resolve the controversies generated regarding the origin of petroleum source rock in the Niger Delta. Results showed that ten shale sections were considered good for source rock analysis based on their thicknesses, greater than 30ft (100m). GR (TOC) calculated from GR curve indicated that TOC decreases with depth. Agbada sections (shallower formation) has GR (TOC) that ranges from 3.7 to 4.4wt%, while Akata sections (deeper formation) has GR (TOC) averages 3.8 and 3.9 wt%. Trends of the bulk density and resistivity data were unable to detect the source rock directly in Agbada sections, but resistivity variation with depth was confirmatory. Akata sections were easily identified with opposite trends of resistivity and bulk density curves together with clear maturity zones. Investigations showed three zones of organic maturity of source rocks: an immature zone above, a peak generation and accumulation zone in the middle and a mature, expulsion and migration zone at the base. True resistivity (Rt) is low in the immature zone, increase to maximum in the accumulation zone, and deceases to an intermediate value in the migration zone.

Reference this Paper: Investigation of Petroleum Source Rock Potential and Maturity in Pologbene-001 from resistivity and density logs, Northern Depobelt Eocene Deposits, Niger Delta, Nigeria by Benson Akinbode Olisa published at: "Scientific Research Journal (Scirj), Volume VI, Issue VIII, August 2018 Edition, Page 81-88 ".

Search Terms: Source rock, resistivity, density, depobelt, maturity

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