Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria

The ongoing exploration activities at the Maiganga coal mine uncover some missing gaps in the stratigraphy of the Late Cretaceous Gombe Formation. Therefore, there is a need to further investigate this sequence, including the organic facies variations and distributions of the coals, mudstones and sa...

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Main Authors: Ayinla, H.A., Abdullah, W.H., Makeen, Y.M., Abubakar, M.B., Jauro, A., Sarki Yandoka, B.M., Mustapha, K.A., Zainal Abidin, N.S.
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Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.19573 /
Published: Elsevier B.V. 2017
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015026865&doi=10.1016%2fj.coal.2017.02.011&partnerID=40&md5=a2bf62a6b0fe698e504b585c57380f26
http://eprints.utp.edu.my/19573/
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spelling utp-eprints.195732018-04-20T07:10:21Z Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria Ayinla, H.A. Abdullah, W.H. Makeen, Y.M. Abubakar, M.B. Jauro, A. Sarki Yandoka, B.M. Mustapha, K.A. Zainal Abidin, N.S. The ongoing exploration activities at the Maiganga coal mine uncover some missing gaps in the stratigraphy of the Late Cretaceous Gombe Formation. Therefore, there is a need to further investigate this sequence, including the organic facies variations and distributions of the coals, mudstones and sandy-shaly sediments in the Gombe Sandstone (Formation), Gongola Sub-basin, Northern Benue Trough of Northeastern Nigeria. Geochemical and petrographic methods were used to assess the organic matter source input, paleodepositional conditions, thermal maturity and hydrocarbon generation potential of the analysed Maiganga and Yaya-Ngari samples. Field observations showed four coal seams interbedded with mudstones and shales deposited in coarsening upward sequence of a deltaic environment. Evaluation based on the source rock analyses (SRA) reveals that Maiganga sedimentary facies is dominated by terrestrial source input of Type III kerogen. This is supported by the biomarker study suggesting land plant origin for the organic matter with minor lacustrine and marine influences, in Maiganga, that grades into predominantly mixed organic matter input of a transitional (terrestrial to marine) environment in the Yaya-Ngari area. This shows a progressive movement towards marine source input. Paleodepositional conditions of organic matters were sub-oxic to oxic in Maiganga, while the mixed organic matters in Yaya-Ngari were deposited in sub-oxic conditions. Based on organic petrology and bitumen extraction data, the Maiganga coal was distinctly observed to be immature of pre-oil generation window, while the Yaya-Ngari is in early oil generation window. These analysed sediments are mainly gas prone based on the dominance of Type III kerogen, although the presence of Type II/III kerogen supported by relatively higher HI may indicate gas/oil potential for the Maiganga coal. On the other hand, Type IV kerogen dominated the Yaya-Ngari samples. This suggests that these shales are gas prone or do not possess any hydrocarbon generation potential as indicated by the very low HI values. © 2017 Elsevier B.V. Elsevier B.V. 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015026865&doi=10.1016%2fj.coal.2017.02.011&partnerID=40&md5=a2bf62a6b0fe698e504b585c57380f26 Ayinla, H.A. and Abdullah, W.H. and Makeen, Y.M. and Abubakar, M.B. and Jauro, A. and Sarki Yandoka, B.M. and Mustapha, K.A. and Zainal Abidin, N.S. (2017) Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria. International Journal of Coal Geology, 173 . pp. 212-226. http://eprints.utp.edu.my/19573/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description The ongoing exploration activities at the Maiganga coal mine uncover some missing gaps in the stratigraphy of the Late Cretaceous Gombe Formation. Therefore, there is a need to further investigate this sequence, including the organic facies variations and distributions of the coals, mudstones and sandy-shaly sediments in the Gombe Sandstone (Formation), Gongola Sub-basin, Northern Benue Trough of Northeastern Nigeria. Geochemical and petrographic methods were used to assess the organic matter source input, paleodepositional conditions, thermal maturity and hydrocarbon generation potential of the analysed Maiganga and Yaya-Ngari samples. Field observations showed four coal seams interbedded with mudstones and shales deposited in coarsening upward sequence of a deltaic environment. Evaluation based on the source rock analyses (SRA) reveals that Maiganga sedimentary facies is dominated by terrestrial source input of Type III kerogen. This is supported by the biomarker study suggesting land plant origin for the organic matter with minor lacustrine and marine influences, in Maiganga, that grades into predominantly mixed organic matter input of a transitional (terrestrial to marine) environment in the Yaya-Ngari area. This shows a progressive movement towards marine source input. Paleodepositional conditions of organic matters were sub-oxic to oxic in Maiganga, while the mixed organic matters in Yaya-Ngari were deposited in sub-oxic conditions. Based on organic petrology and bitumen extraction data, the Maiganga coal was distinctly observed to be immature of pre-oil generation window, while the Yaya-Ngari is in early oil generation window. These analysed sediments are mainly gas prone based on the dominance of Type III kerogen, although the presence of Type II/III kerogen supported by relatively higher HI may indicate gas/oil potential for the Maiganga coal. On the other hand, Type IV kerogen dominated the Yaya-Ngari samples. This suggests that these shales are gas prone or do not possess any hydrocarbon generation potential as indicated by the very low HI values. © 2017 Elsevier B.V.
format Article
author Ayinla, H.A.
Abdullah, W.H.
Makeen, Y.M.
Abubakar, M.B.
Jauro, A.
Sarki Yandoka, B.M.
Mustapha, K.A.
Zainal Abidin, N.S.
spellingShingle Ayinla, H.A.
Abdullah, W.H.
Makeen, Y.M.
Abubakar, M.B.
Jauro, A.
Sarki Yandoka, B.M.
Mustapha, K.A.
Zainal Abidin, N.S.
Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria
author_sort Ayinla, H.A.
title Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria
title_short Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria
title_full Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria
title_fullStr Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria
title_full_unstemmed Source rock characteristics, depositional setting and hydrocarbon generation potential of Cretaceous coals and organic rich mudstones from Gombe Formation, Gongola Sub-basin, Northern Benue Trough, NE Nigeria
title_sort source rock characteristics, depositional setting and hydrocarbon generation potential of cretaceous coals and organic rich mudstones from gombe formation, gongola sub-basin, northern benue trough, ne nigeria
publisher Elsevier B.V.
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015026865&doi=10.1016%2fj.coal.2017.02.011&partnerID=40&md5=a2bf62a6b0fe698e504b585c57380f26
http://eprints.utp.edu.my/19573/
_version_ 1741196228656365568
score 11.62408

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