Depositional environment and reservoir characterization of the deep offshore Upper Miocene to Early Pliocene Agbada Formation, Niger delta, Nigeria

Olayiwola, Moshood Adegboyega; Bamford, K. Marion

doi:10.1016/j.jafrearsci.2019.103578

Cited by 12 publications

(20 citation statements)

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“…The gamma‐ray log signatures with the evidence of massive, and cored sands indicate a high instantaneous sedimentation rate (Olayiwola & Bamford, 2019; Rider, 1990), too rapid for the formation of distinct primary sedimentary structures (Lien et al, 2006). The variable‐sized pebbles and rip‐up clast of the underlying shale with an erosive base indicate sedimentation under high depositional energy conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The gamma-ray log motif indicates variable sedimentation patterns from aggradation to progradation (Olayiwola & Bamford, 2019;Rider, 1990). The banded lamination suggests deposition in a Stevenson et al, 2020;Sychala et al, 2015).…”

Section: D2 Sandstone Lithofaciesmentioning

confidence: 98%

“…The gamma-ray log signatures with the evidence of massive, and cored sands indicate a high instantaneous sedimentation rate (Olayiwola & Bamford, 2019;Rider, 1990), too rapid for the formation of distinct primary sedimentary structures (Lien et al, 2006). The Because D1 is from the Broom Formation interpreted as a prograded fan delta system into a shallow marine environment (Baumann & O'Cathain, 1991;Richard, 1992), it is likely to have been deposited in the channelized or subaqueous portions of this setting.…”

Section: D1 Sandstone Lithofaciesmentioning

confidence: 99%

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Influence of reservoir oil charging on diagenesis and reservoir quality: An example from Dunlin Reservoir Sandstones, East Shetland Basin, North Sea, UK

Okunuwadje,

Ogbe,

Odokuma‐Alonge

2023

Geological Journal

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The sandstone facies from two reservoir blocks (extensional fault walls) of the Dunlin Field have been studied to evaluate the impact of the reservoir charge history on the diagenesis and reservoir quality of these sandstones. The study has identified seven main reservoir sandstone facies (D1–D7) from the reservoir crestal block (oil leg) to the flank block (water leg). These sandstone facies exhibited similar diagenetic patterns, controlled by their depositional parameters, hence having the same porosity and permeability values in both reservoir blocks (legs) until hydrocarbon charging in the Late Cretaceous‐Pliocene. The burial and thermal model indicates that these reservoirs were charged at a temperature of 60–75°C during the 80–50 Ma and 95–100°C during the 10 Ma to Present, and significantly controlled the mesodiagenetic output, notably illite, and quartz authigenesis. The reservoir oil leg recorded a higher amount of recovered bitumen (ca. 95%) than the water leg (ca. 5%), indicating that hydrocarbon charging of the sandstone reservoir was progressive rather than instantaneous, first filling the water leg (palaeo‐oil leg). Subsequent leak‐off depleted this reservoir block and remigrated to fill the reservoir leg (palaeo‐water). The fluctuating oil charging and leakage between these two reservoir fault blocks modulated diagenetic alteration of these reservoir sandstones; hence is the cause of the minor disparity in porosity values between these reservoir legs contrary to the wide variation between conventional reservoir oil‐ and water‐legs distinguished by hydrocarbon emplacement with no such complex history. This study, therefore, demonstrates the importance of evaluating the depositional and diagenetic controls on reservoir quality and charging of hydrocarbon‐bearing sandstones for optimum oil production and recovery in clastic depositional settings.

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Section: Discussionmentioning

confidence: 99%

Section: D2 Sandstone Lithofaciesmentioning

confidence: 98%

Section: D1 Sandstone Lithofaciesmentioning

confidence: 99%

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Influence of reservoir oil charging on diagenesis and reservoir quality: An example from Dunlin Reservoir Sandstones, East Shetland Basin, North Sea, UK

Okunuwadje,

Ogbe,

Odokuma‐Alonge

2023

Geological Journal

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“…Selley (1978) argued that well-log curves (e.g., GR and SP) reflect the grain size distribution in sedimentary successions and, thus, the depositional environment of rock successions. Later, many researchers have introduced and applied some classifications for different log-curve shapes to interpret depositional facies in subsurface sections based on log-curve patterns (Garcia 1981;Serra 1989;Rider 1990;Wagoner et al 1990;Boggs 1995;Emery and Myers 1996;Olayiwola and Bamford 2019). Among the well-log curves, GR patterns are the widely used log curves for analysis of subsurface depositional environment (Rider 1990;Cant 1992;Chow et al 2005).…”

Section: Electrofacies Interpretation From Gr Logmentioning

confidence: 99%

Modeling the Depositional Environment of the Sandstone Reservoir in the Middle Miocene Sidri Member, Badri Field, Gulf of Suez Basin, Egypt: Integration of Gamma-Ray Log Patterns and Petrographic Characteristics of Lithology

Radwan

2020

Nat Resour Res

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Understanding the depositional setting of siliciclastics reservoir is fundamental process to exploration and development of hydrocarbon reservoirs and to the multi-phase cycle of the oil and gas industry. Typically, core samples from existing or potential reservoirs can be used for interpretation of depositional environment. However, the lack of core samples in certain reservoirs represents a challenge for reservoir development plans and further exploration. To overcome the absence of core samples in the middle Miocene Sidri Member in the Badri field, Gulf of Suez, this study aimed to reconstruct its depositional settings by coupling well logging patterns and petrographic characterization of ditch cuttings. Consequently, 30 thin section samples representing the reservoir section of four wells were described in detail and standard petrographic characteristics were determined. Then, gamma-ray (GR) log patterns of the studied reservoir wells were used for interpretation of depositional environment. Petrographic analysis indicates that the sandstone reservoir is fine- to medium-grained arkose with dominant siliceous cement and composed mainly of quartz, feldspars, and lithic fragments. Pores reflecting primary and secondary porosity as well as inter-granular pores are dominant. The facies analysis indicates that the studied member has a heterogeneous nature and rapid facies change; its main lithofacies are blocky sandstones, intercalated sandstones and shales, and shales. Three electrofacies were interpreted in the studied section: (1) electrofacies-A (blocky sandstones), which is characterized by a cylindrical-shaped (right boxcar) GR trend; (2) electrofacies-B (intercalated sandstones and shales), which is characterized by an irregular log trend with serrated shape; and (3) electrofacies-C (shales), which is characterized by irregular GR trend and has no character. The interpreted results indicate a tidal channel depositional setting for electrofacies-A, mixed tidal flat depositional setting for electrofacies-B, and low relief offshore mudstone depositional setting for electrofacies-C. Finally, the results illustrate how the coupling of GR patterns with the analysis of petrographic characteristics can be used to understand the depositional setting of a hydrocarbon reservoir that lacks core samples. This work could be useful for assessment of reservoir distribution and quality, for reduction of uncertainty during field development, as well as for providing useful insight to similar hydrocarbon reservoirs elsewhere.

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“…Most previous biostratigraphic and paleoenvironmental studies in Nigerian basins are concentrated within the Niger Delta Basin owing to intense hydrocarbon explorations and exploitation activities in the region (e.g. Fajemila, 2012;Fadiya et al, 2014;Ikegwuonu and Umeji, 2016;Bankole et al, 2016;Chukwuma-Orji et al, 2017;Olayiwola and Bamford, 2019;Olayiwola, 2021;Fajemila et al, 2022). In the Dahomey Basin, a small number of studies have employed palynological investigation in bio stratigraphic and paleoenvironmental analyses (e.g.…”

Section: Introduction E-issn 2082-0259mentioning

confidence: 99%

Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs

Oláyíwolá¹,

Durugbo²,

Fajemila³

2022

Acta Palaeobot.

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This study presents the results of a comprehensive qualitative and quantitative palynological analysis of four shallow boreholes (Epe-1, Olokonla-1, Ikoyi-1 and Badore-1) in the lower Eocene–upper Oligocene periods of the Dahomey Basin, southwestern Nigeria. The lithostratigraphic analysis revealed three lithologies (sandy-shales, shaly-sands and sandstones). Two most important palynological zones, the Verrucatosporites usmensis, as well as the Magnastriatites howardi Pan-tropical zones, are delineated. First Appearance Datum (FAD) of Achomosphaera alcicornu marked the late Eocene–early Oligocene boundaries (E/O) within the four boreholes, while FAD of Adnatosphaeridium multispinosum defined the late Eocene–early Oligocene boundary (E/O) in Ikoy-1. Two informal palynological assemblage zones were revealed in the four boreholes. Common occurrences of palms, mangrove, fresh water and brackish water pollen, and pteridophyte spores with spots records of marine elements and algae species during marine invasion suggested fluctuation from fluvio-deltaic/nearshore to marginal marine paleoenvironments. Graphic correlation discloses that for every meter of sedimentary rock accretion within Epe-1, equally amounted to merely 0.31 m, 0.56 m, as well as 0.47 m of sediments, which were put down in Olokonla-1, Ikoyi-1, as well as Badore-1, respectively. These comparative rates of sedimentary rock accretion show with the purpose of either there is fewer attrition occurrence and/or extra accommodation gap within Epe-1 than Olokonla-1, Ikoyi-1, as well as Badore-1. The assessment of the slopes, intercept and correlation equations through graphic correlation procedures enable the identification of four biostratigraphic events in Epe-1, Olokonla-1, Ikoyi-1, as well as Badore-1. The findings in this investigation are necessary for depositional succession and paleoenvironmental understandings, as well as basin investigation, and above all, to show a relationship of broadly separated boreholes.

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Depositional environment and reservoir characterization of the deep offshore Upper Miocene to Early Pliocene Agbada Formation, Niger delta, Nigeria

Cited by 12 publications

References 13 publications

Influence of reservoir oil charging on diagenesis and reservoir quality: An example from Dunlin Reservoir Sandstones, East Shetland Basin, North Sea, UK

Influence of reservoir oil charging on diagenesis and reservoir quality: An example from Dunlin Reservoir Sandstones, East Shetland Basin, North Sea, UK

Modeling the Depositional Environment of the Sandstone Reservoir in the Middle Miocene Sidri Member, Badri Field, Gulf of Suez Basin, Egypt: Integration of Gamma-Ray Log Patterns and Petrographic Characteristics of Lithology

Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs

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