International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 9, September 2017

International Journal of Science and Technology


Well Logs – 3 D Seismic Sequence Stratigraphy Evaluation of “Holu” Field, Niger Delta, Nigeria

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Author John O. Amigun, Olumide Adewoye, Temitope Olowolafe, Emmanuel Okwoli
On Pages 26-36
Volume No. 4
Issue No. 2
Issue Date February 01, 2014
Publishing Date February 01, 2014
Keywords seismic sequence stratigraphy; system tracts; lithofacies; Niger delta; well logs, seismic facies.


Abstract

Three Wells, check-shot and 3-D seismic data were used to evaluate the lithology, lithofacies, sequence stratigraphy, seismic facies and depositional environments of “Holu” field, Niger delta. Its well logs sequence stratigraphic analysis revealed five depositional sequences with associated six sequence boundaries (SB1, SB2, SB3, SB4, SB5 and SB6 ) occur at respective depths of (1905 m, 1680 m, 1550 m, 1385 m, 1345 m, and 1275 m), five maximum flooding surfaces (MFS1, MFS2, MFS3, MFS4 and MFS5) each associated with depositional sequences at respective depths of (1755 m, 1575 m, 1405 m, 1360 m and 1305 m) and five system tracts. The 1st depositional sequence consist of two system tracts (TST and HST), 2nd depositional sequence is made up of three system tracts (LST, TST and HST), 3rd depositional sequence consist of two system tracts (TST and HST), 4th depositional sequence is made up of three system tracts (LST, TST and HST) and the 5th depositional sequence also possessed three system tracts (LST, TST and HST). The well logs also revealed dominant lithologies (sand and shale). Log facies shows heamipelagic shale, marine shale, fluvial channel fill sands, transgressive sands and crevasse splay sands. Characteristics seismic facies involving amplitude, continuity, frequency and reflection configuration deduced “Holu” field environment of deposition to be fluvial systems to marine environments.

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