eprintid: 9211
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/92/11
datestamp: 2023-11-09 16:21:10
lastmod: 2023-11-09 16:21:10
status_changed: 2023-11-09 16:14:32
type: article
metadata_visibility: show
creators_name: Togunwa, O.S.
creators_name: Abdullah, W.H.
title: Geochemical characterization of Neogene sediments from onshore West Baram Delta Province, Sarawak: Paleoenvironment, source input and thermal maturity
ispublished: pub
keywords: Hydrocarbons; Offshore oil well production; Offshore oil wells; Oil bearing formations; Oil shale; Organic carbon; Oxic sediments; Reflection; Stratigraphy; Trace elements, Depositional environment; Geochemical characterization; Neo genes; Redox-sensitive trace elements; Sarawak; Saturated hydrocarbons; Terrigenous; Thermal maturity, Biomarkers, biomarker; depositional environment; hydrocarbon; hydrocarbon generation; Neogene; organic carbon; organic matter; paleoenvironment; sediment chemistry; stratigraphy; terrigenous deposit; thermal maturity; trace element; vitrinite reflectance, Baram Basin; Borneo; East Malaysia; Malaysia; Pacific Ocean; Sarawak; South China Sea, Embryophyta
note: cited By 9
abstract: The Neogene strata of the onshore West Baram Province of NW Borneo contain organic rich rock formations particularly within the Sarawak basin. This basin is a proven prolific oil and gas province, thus has been a subject of great interest to characterise the nature of the organic source input and depositional environment conditions as well as thermal maturation. This study is performed on outcrop samples of Lambir, Miri and Tukau formations, which are of stratigraphic equivalence to the petroleum bearing cycles of the offshore West Baram delta province in Sarawak. The investigated mudstone samples are organic rich with a total organic carbon (TOC) content of more than 1.0 wt.. The integration of elemental and molecular analyses indicates that there is no significant variation in the source input between these formations. The investigated biomarkers parameters achieved from acyclic isoprenoids, terpanes and steranes biomarkers of a saturated hydrocarbon biomarkers revealed that these sediments contain high contribution of land plants with minor marine organic matter input that was deposited and preserved under relatively oxic to suboxic conditions. This is further supported by low total sulphur (TS), high TOC/TN ratios, source and redox sensitive trace elements (V, Ni, Cr, Co and Mo) concentrations and their ratios, which suggest terrigenous source input deposited under oxic to suboxic conditions. Based on the analysed biomarker thermal maturity indicators, it may be deduced that the studied sediments are yet to enter the maturity stage for hydrocarbon generation, which is also supported by measured vitrinite reflectance values of 0.39-0.48 Ro. © 2017 O. S. Togunwa and W. H. Abdullah.
date: 2017
publisher: De Gruyter Open Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028651294&doi=10.1515%2fgeo-2017-0025&partnerID=40&md5=b481d1e97f09e1bf453e594478f164e2
id_number: 10.1515/geo-2017-0025
full_text_status: none
publication: Open Geosciences
volume: 9
number: 1
pagerange: 302-313
refereed: TRUE
issn: 23915447
citation:   Togunwa, O.S. and Abdullah, W.H.  (2017) Geochemical characterization of Neogene sediments from onshore West Baram Delta Province, Sarawak: Paleoenvironment, source input and thermal maturity.  Open Geosciences, 9 (1).  pp. 302-313.  ISSN 23915447