10.57647/j.ijes.2025.1702.09

Sequence stratigraphic interpretation of Middle–Late Miocene successions of OMAH–1 well Offshore Niger Delta, Nigeria

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  • Samuel Okechukwu Onyekuru1,
  • Obiageli Vivian Adumekwe1,
  • Aniediobong Jonah Ukpong2,
  • Diugo Okereke Ikoro1,
  • Timothy Chibuike Anyanwu*1,
  • Ifeyinwa Juliana Ofoh2,
  1. Department of Geology, Federal University of Technology, Owerri, Nigeria.
  2. Department of Geology, University of Calabar, Calabar, Nigeria.
Sequence stratigraphic interpretation of Middle–Late Miocene successions of OMAH–1 well Offshore Niger Delta, Nigeria

Received: 2024-02-16

Revised: 2024-05-05

Accepted: 2024-09-12

Published in Issue 2025-04-10

Copyright (c) 2025 Samuel Okechukwu Onyekuru, Obiageli Vivian Adumekwe, Aniediobong Jonah Ukpong, Diugo Okereke Ikoro, Timothy Chibuike Anyanwu, Ifeyinwa Juliana Ofoh (Author)

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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Okechukwu Onyekuru, S., Vivian Adumekwe, O., Jonah Ukpong, A., Okereke Ikoro, D., Chibuike Anyanwu, T., & Juliana Ofoh, I. (2025). Sequence stratigraphic interpretation of Middle–Late Miocene successions of OMAH–1 well Offshore Niger Delta, Nigeria. Iranian Journal of Earth Sciences, 17(2), 1-14. https://doi.org/10.57647/j.ijes.2025.1702.09
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Abstract

Sequence stratigraphic analysis provides indications of depositional systems and specific cycles of sedimentation. Such studies are useful for the prediction of quality and geometry of reservoir systems. Ditch cuttings and Well log data recovered from the Middle-Late Miocene “OMAH-1 Well”, Offshore Niger Delta, Nigeria were analysed in order to have a proper understanding of rock units’ relationships with chronostratigraphy and depositional environment-significant forms. Results of paleobathymetry of the deposits using benthic foraminifera ranged from coastal deltaic to shallow marine (shallow inner neritic, inner neritic and middle neritic)  settings. Two foraminiferal zones and four palynological zones indicative of Middle–Late Miocene age was identified. Four (4)  sequence boundaries (SBs) were identified and dated: SB 1 at 7250 ft. dated 10.6 Ma, SB 2 at 6530 ft. dated 10.35 Ma, SB 3 at 4400 ft. dated 8.5 Ma and SB 4 at 2210 ft. dated 6.7 Ma. Three (3) maximum flooding surfaces (MFS) were also identified viz: MFS 1 dated 10.4 Ma at 6910 ft., MFS 2 dated 9.5 Ma at 5150 ft. and MFS 3 dated 7.4 Ma at 2930 ft. These surfaces were used to subdivide the stratigraphic column in the well section into five depositional sequences (Sequence I-V) characterized by Lowstand systems tract, Transgressive systems tract and Highstand systems Tract. The depositional sequences identified have quality reservoirs and source rocks with high potential for hydrocarbon generation.

Keywords

  • Niger Delta,
  • Chronostratigraphy,
  • Paleobathymetry,
  • Sedimentary cycle,
  • Sequence stratigraphy
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