An organic geochemical investigation on organic rich sediments from two Neogene formations in the Klias Peninsula area, West Sabah, Malaysia

Amer M. Burgan, Che Aziz Ali

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Twenty organic rich outcrop samples from the Belait and Setap Shale formations in the Klias Peninsula area, West Sabah, were analysed by means of organic petrology and geochemical techniques. The aims of this study are to assess the type of organic matter, thermal maturity and established source rock characterization based primarily on Rock-Eval pyrolysis data. The shales of the Setap Shale Formation have TOC values varying from 0.6 wt%-1.54 wt% with a mean hydrogen index (HI) of 60.1 mg/ g, whereas the shales of the Belait Formation have TOC values ranging from 0.36 wt%-0.61 wt% with a mean (HI) of 38.2 mg/g, indicating that both formations have TOC>0.5 wt% the minimum limit for hydrocarbon generation. The samples do not contain sufficient hydrogen-rich organic matter (types I, II and III) to be considered good quality source rocks. The kerogen of type II is predominantly of marine origin. This organic matter was deposited in clastic algal environments. Geochemical data (Rock-Eval, Tmax values ranging from 377-451°C for shales of the Setap Shale Formation and ranging from 466-498°C for shales of the Belait Formation, typical of high maturity), indicate variable maturation histories in both formations. The maturation level varied from the beginning to the peak stage of oil generation in the Setap Shale Formation and it has reached the over-mature level in the samples of the Belait Formation.

Original languageEnglish
Pages (from-to)264-270
Number of pages7
JournalChinese Journal of Geochemistry
Volume28
Issue number3
DOIs
Publication statusPublished - 2009

Fingerprint

Shale
Neogene
shale
Sediments
Rocks
Biological materials
Hydrogen
hydrogen
organic matter
sediment
source rock
maturation
Petrology
Kerogen
thermal maturity
hydrocarbon generation
kerogen
Hydrocarbons
petrology
rock

Keywords

  • Kerogen
  • Klias Peninsula
  • Neogene formation
  • Organic rich sediment
  • TOC

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

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title = "An organic geochemical investigation on organic rich sediments from two Neogene formations in the Klias Peninsula area, West Sabah, Malaysia",
abstract = "Twenty organic rich outcrop samples from the Belait and Setap Shale formations in the Klias Peninsula area, West Sabah, were analysed by means of organic petrology and geochemical techniques. The aims of this study are to assess the type of organic matter, thermal maturity and established source rock characterization based primarily on Rock-Eval pyrolysis data. The shales of the Setap Shale Formation have TOC values varying from 0.6 wt{\%}-1.54 wt{\%} with a mean hydrogen index (HI) of 60.1 mg/ g, whereas the shales of the Belait Formation have TOC values ranging from 0.36 wt{\%}-0.61 wt{\%} with a mean (HI) of 38.2 mg/g, indicating that both formations have TOC>0.5 wt{\%} the minimum limit for hydrocarbon generation. The samples do not contain sufficient hydrogen-rich organic matter (types I, II and III) to be considered good quality source rocks. The kerogen of type II is predominantly of marine origin. This organic matter was deposited in clastic algal environments. Geochemical data (Rock-Eval, Tmax values ranging from 377-451°C for shales of the Setap Shale Formation and ranging from 466-498°C for shales of the Belait Formation, typical of high maturity), indicate variable maturation histories in both formations. The maturation level varied from the beginning to the peak stage of oil generation in the Setap Shale Formation and it has reached the over-mature level in the samples of the Belait Formation.",
keywords = "Kerogen, Klias Peninsula, Neogene formation, Organic rich sediment, TOC",
author = "Burgan, {Amer M.} and Ali, {Che Aziz}",
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AU - Burgan, Amer M.

AU - Ali, Che Aziz

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N2 - Twenty organic rich outcrop samples from the Belait and Setap Shale formations in the Klias Peninsula area, West Sabah, were analysed by means of organic petrology and geochemical techniques. The aims of this study are to assess the type of organic matter, thermal maturity and established source rock characterization based primarily on Rock-Eval pyrolysis data. The shales of the Setap Shale Formation have TOC values varying from 0.6 wt%-1.54 wt% with a mean hydrogen index (HI) of 60.1 mg/ g, whereas the shales of the Belait Formation have TOC values ranging from 0.36 wt%-0.61 wt% with a mean (HI) of 38.2 mg/g, indicating that both formations have TOC>0.5 wt% the minimum limit for hydrocarbon generation. The samples do not contain sufficient hydrogen-rich organic matter (types I, II and III) to be considered good quality source rocks. The kerogen of type II is predominantly of marine origin. This organic matter was deposited in clastic algal environments. Geochemical data (Rock-Eval, Tmax values ranging from 377-451°C for shales of the Setap Shale Formation and ranging from 466-498°C for shales of the Belait Formation, typical of high maturity), indicate variable maturation histories in both formations. The maturation level varied from the beginning to the peak stage of oil generation in the Setap Shale Formation and it has reached the over-mature level in the samples of the Belait Formation.

AB - Twenty organic rich outcrop samples from the Belait and Setap Shale formations in the Klias Peninsula area, West Sabah, were analysed by means of organic petrology and geochemical techniques. The aims of this study are to assess the type of organic matter, thermal maturity and established source rock characterization based primarily on Rock-Eval pyrolysis data. The shales of the Setap Shale Formation have TOC values varying from 0.6 wt%-1.54 wt% with a mean hydrogen index (HI) of 60.1 mg/ g, whereas the shales of the Belait Formation have TOC values ranging from 0.36 wt%-0.61 wt% with a mean (HI) of 38.2 mg/g, indicating that both formations have TOC>0.5 wt% the minimum limit for hydrocarbon generation. The samples do not contain sufficient hydrogen-rich organic matter (types I, II and III) to be considered good quality source rocks. The kerogen of type II is predominantly of marine origin. This organic matter was deposited in clastic algal environments. Geochemical data (Rock-Eval, Tmax values ranging from 377-451°C for shales of the Setap Shale Formation and ranging from 466-498°C for shales of the Belait Formation, typical of high maturity), indicate variable maturation histories in both formations. The maturation level varied from the beginning to the peak stage of oil generation in the Setap Shale Formation and it has reached the over-mature level in the samples of the Belait Formation.

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