Diagenesis and reservoir quality in high-resolution sandstone sequences: An example from the Middle Jurassic Ravenscar sandstones, Yorkshire CoastUK

Okunuwadje, Sunday E.; Bowden, Stephen; Macdonald, David I. M.

doi:10.1016/j.marpetgeo.2020.104426

Cited by 17 publications

(9 citation statements)

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“…The erosive base is interpreted as formed as high energy channels drain into open water bodies, cutting into underlying soft sediments (Collinson et al, 2006). The presence of lamination suggests deposition from suspension, possibly resulting from channel abandonment (Miall, 2006) or deposition in a back‐barrier (lagoonal) environment (Elliott, 1984; Okunuwadje, Bowden, et al, 2020). However, faintly lamination could have resulted from intense bioturbation (MacEachern et al, 2007; Taylor & Goldring, 1993) or rapid sedimentation (Lien et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…These diagenetic fabrics are developed by intense mechanical compaction following increased sediment load and vertical stress, squeezing grains together and reducing inter‐grain pore spaces. These diagenetic features have been linked to mesodiagenesis (Figure 14a), which typically occurs at depths exceeding 2 km (Bjørlykke & Jahren, 2010; Morad et al, 2000; Okunuwadje, 2019; Okunuwadje, Bowden, et al, 2020; Okunuwadje, Macdonald, et al, 2020; Oluwadebi et al, 2018; Schmidt & McDonald, 1984; Worden & Burley, 2003; Zeng, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Porosity determines the hydrocarbon storage capacity, whereas permeability controls the hydrocarbon flow and production capacity (Haile et al, 2018; Ogbe, 2020; Wang et al, 2017). Unfortunately, these petrophysical properties can vary considerably within sandstone bodies and can be controlled by depositional parameters (Adepehin et al, 2022; Lai et al, 2015; Lan et al, 2016; Ogbe, 2021; Okunuwadje et al, 2017; Price et al, 2020; Saiag et al, 2016; Zahid et al, 2016), mineralogical composition (Adepehin et al, 2022; Dutton et al, 2012; Fadipe et al, 2011; Griffiths et al, 2019; Jeans, 2000; Zaid, 2013), and diagenetic fabrics (Bjørlykke, 2014; Gier et al, 2008; Henares et al, 2016; Lai et al, 2015, 2018; Okunuwadje, Bowden, et al, 2020; Okunuwadje, Macdonald, et al, 2020; Rossi et al, 2002; Sun et al, 2020; Zhao et al, 2022). Variations in these controlling factors often result in reservoir heterogeneity at different scales, ranging from micrometres to hundreds of meters (Morad et al, 2010).…”

Section: Introductionmentioning

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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…This method assumes that compaction occurs prior to cementation and dissolution, so the intergranular volume (IGV) includes the pore volume filled by cementation that is intergranular pores, in addition to the volume of matrix and cements. The increased pore volume due to the dissolution of matrix should be removed, making the calculation of porosity loss accurate [4].…”

Section: Porosity Loss Calculationmentioning

confidence: 99%

“…Compaction is an important component of diagenesis and is regarded as central to the reduction of reservoir physical properties [1][2][3][4][5]. In classical diagenetic theory, it is believed that the compaction of clastic sediments is caused by the effective stress of the overlying stratum [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)

Luo

Fan³

et al. 2021

Geofluids

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Compaction is regarded as central to the reduction of reservoir physical properties. The thermal compaction process controlled by a basin’s heat flow and the static compaction caused by overload on rocks are both important factors controlling the compaction strength. However, porosity loss resulting from thermal and static compaction has not been distinguished. The Baiyun Sag in the Pearl River Mouth Basin in the northern part of the South China Sea with high heat flows and a variable geothermal gradient is an ideal setting for studying the characteristics and mechanisms of the thermal compaction process. The characteristics of compaction and the effect of thermal fluid activities on reservoir physical properties are carried out, based on the observation and identification of sandstone thin sections under a microscope, the measurement and simulation of the temperatures and trapping pressures of fluid inclusions, and the calculation of the compaction porosity loss as well. The result shows that the compaction mode of sandstone reservoirs in the Zhuhai Formation is dominated by static compaction in the LGR (the low geothermal gradient region), whereas the diagenetic process of the Zhuhai Formation in the MGR (the moderate geothermal gradient region) and HGR (the high geothermal gradient region) is affected not only by the static compaction effect but also by the thermal compaction effect caused by abnormal formation temperature and pressure conditions. The porosity loss caused by the thermal compaction ranges from 5.5% to 11.2% with an average of 7.9% and from 4.6% to 16.6% with an average of 10.2% in the MGR and HGR, respectively. The porosity loss caused by the static compaction ranges from 15.9% to 20.8% with an average of 19.4% and from 8.4% to 15.8% with an average of 12.8% in the MGR and HGR, respectively.

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Sequence stratigraphy, sedimentary characteristics of barrier coastal sedimentary system of the Benxi Formation (Gaoqiao area, Ordos basin) and favorable reservoir distribution

Diagenesis and reservoir quality in high-resolution sandstone sequences: An example from the Middle Jurassic Ravenscar sandstones, Yorkshire CoastUK

Cited by 17 publications

References 52 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

Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)

Sequence stratigraphy, sedimentary characteristics of barrier coastal sedimentary system of the Benxi Formation (Gaoqiao area, Ordos basin) and favorable reservoir distribution

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