Interaction between sea-level changes and depositional tectonics: Implications for hydrocarbon prospectivity in the western coastal swamp depobelt, Niger Delta Basin, Nigeria

Ogbe, Ovie B.; Osokpor, Jerry; Omeru, Tuviere; Okunuwadje, Sunday E.

doi:10.1306/05091918077

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…It could be observed in some areas as a SB landward of where the rate of an influx of sediment is high over a transgressive surface of erosion (TSE) and merges with a maximum flooding surface where the rate of influx of sediment is low over the TSE ( Mitchum, 1977 ; Catuneanu, 2002 ). The sequence stratigraphic evolution of the Nanka Formation is related to an episode when the rate of sedimentation of the subtidal bars facies association was greater than the rate of an accommodation space that was succeeded by an erosion ( Ogbe et al., 2020 ) and an abrupt rise in sea-level with retrogradation of the tidal mudflat deposit. Deposition of the subaerial plain on the shallow marine facies suggests that there was a progradational shoreline translation within the ancient tidal and fluvial influenced deltaic systems ( Vos, 1977 ).…”

Section: Discussionmentioning

confidence: 99%

“…Depositional environment affected the sedimentation pattern and stratigraphic base level facies association, where it attained a shallow sea-level when an accommodation space was limited by an erosion and subsequently, the facies starts deepen gradually with a slow rate of coastal retrogradation (Figures 12 and 13 ). The stratigraphic association of episodes of an increase in fluvial deltaic sediment supply, and lacustrine facies variability with the SB, suggests a tectonic control on the Niger Delta Basin climate and development ( Mckie and Garden, 1996 ; Osokpor and Ogbe, 2019 ; Ogbe et al., 2020 ). These have probably played a role in the sequence stratigraphy of non-marine/coastal sediments of formations of the passive margin of southern Nigeria basins ( Reyment; 1965 ; Oboh-Ikuenobe et al., 2005 ; Nwajide, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

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Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Ogbe

Osokpor

2021

Heliyon

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Ogbe

Osokpor

2021

Heliyon

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“…Successively younger MFS and SB stratigraphic intervals are, on average, thinner and show more lateral strata thickening basin wards except for the TST of the fourth sequence, which appears to be thinner than that of others; this could be evidence of short sea transgression activity. The observed strata thickening towards the basin is summarized to be a possible result of tectonic structural activities (faulting) that created large accommodation space for sediments accumulation and large-scale deltaic progradation into the basin (e.g., Chima, 2017;Ogbe et al, 2020) as can be seen from the generated well log sand top correlation. This well-log section shows a deepening basinward, which is suggestive of progradation and in conformity with the geology of the Niger Delta (Doust and Omatsola, 1990).…”

Section: 62: Horizon Mapping/interpretationmentioning

confidence: 94%

Reservoir and sequence stratigraphic analysis using subsurface data

Vivian

Kelechi

Lanisa

et al. 2023

Preprint

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There is a growing interest in the Niger Delta hydrocarbon field exploration and exploitation. With growing interest in proven field prospects and confirmed reservoir facies, there is a need for improved basin and field scale reservoir identification, analysis, and assessment. The Agbada Formation of the middle Miocene age across Vim Field, in the western part of the coastal swamp depobelt was studied using wire-line logs, 3D seismic and biostratigraphic data. This contribution evaluated stratigraphic configuration, structural style, facies geometry, hydrocarbon leads, and distribution. The method adopted involves delineating lithologies from the gamma-ray log, identifying reservoirs from the resistivity and gamma ray logs, well top correlation using gamma ray logs, horizon and fault mapping, time to depth conversion of maps using velocity model, attribute analysis, and sequence stratigraphic analysis. Bounding surfaces were mapped on the seismic section, and well correlations were conducted and integrated with a paleobathymetry chart to highlight the depositional environments. Eight major stratigraphic bounding surfaces (four sequence boundaries and four maximum flooding surfaces) were identified. Erosional bounding surfaces were mapped as interest surface horizons. Analysis of the vertical succession of depositional facies revealed five 3rd order depositional sequences of Mid-Miocene age-bound SB and MFS chronologically. Three strata stacking patterns (progradational, retrogradation, and aggradational) were delineated and interpreted as lowstand systems tract (LST), highstand systems tract (HST), and transgressive systems tract (TST). The alternation of the reservoir sands of the HST and TST and the shale units of the TST offers good traps for hydrocarbon. Fault analysis revealed regional growth faults, counter-regional growth faults, synthetic and antithetic faults that show foot walls and hanging walls dominating the mainly extensional zone. These faults play a major role in hydrocarbon trapping within the area. The depositional environment spans from shelf to slope margin, with sediments deposited within the Inner neritic through the middle neritic to the outer neritic settings. Interpretative observation shows that thin-bedded shale facies complexly intercalate the reservoir facies of the TST. Thus careful evaluation of such reservoirs is recommended before making exploitation decisions.

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“…1), onshore Niger Delta. "The Niger Delta Basin has a combination of excellent petroleum system elements" [6,7]. "Hence, the Niger Delta ranks as the world's most prolific petroleum producing Tertiary Delta [8], which holds approximately 2.3% of the world's known oil and gas reserves (79.5 billion bbl of oil and 127.2tcf)" [9,10,11].…”

Section: Location Of the Study Areamentioning

confidence: 99%

Reservoir Characterization using Petrophysical Evaluation of W-Field, Onshore Niger Delta

Lawson

Balogun

2023

AJOPACS

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Reservoir characterization of W-field, onshore Niger Delta was carried out using petrophysical evaluation of well logs. Three reservoir sand intervals (A, B, C) were identified and correlated across four wells (W1, W2, W3, W4) in W-field using the gamma ray, while the fluid identification of each reservoir was achieved using the resistivity log. The reservoir C interval was selected and utilized for petrophysical interpretation was penetrated at depths 11741-11945ft, 11933-12173ft, 11658-11847ft and 11926-12095ft across all wells respectively.The average values of gross thickness, volume of shale, effective porosity, total porosity, permeability, water saturation and hydrocarbon saturation of the delineated reservoir sand are 200.5ft for gross thickness, 18% for shale volume, 21% for effective porosity, 26% for total porosity, 1071.74mD for permeability, and 28% for water saturation and 77% for hydrocarbon saturation. Petrophysical evaluation revealed that porosity and permeability are very good to excellent in the field. The reservoir is classed as clean sands based on the high net to gross ratio (>70%) and the low shale volumes (<30%). Consequently, the low value of shale volume, low value water saturation, high value of hydrocarbon saturation and the good porosity and permeability properties of the reservoir of interest suggest economical and commercial quality and viability of the wells within this field.

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Interaction between sea-level changes and depositional tectonics: Implications for hydrocarbon prospectivity in the western coastal swamp depobelt, Niger Delta Basin, Nigeria

Cited by 11 publications

References 18 publications

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Reservoir and sequence stratigraphic analysis using subsurface data

Reservoir Characterization using Petrophysical Evaluation of W-Field, Onshore Niger Delta

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