The role of fluid pressure and diagenetic cements for porosity preservation in Triassic fluvial reservoirs of the Central Graben, North Sea

Nguyễn, Bình Thị Thanh; Jones, Stuart J.; Goulty, N. R.; Middleton, Alexander J.; Grant, Neil; Ferguson, Alison; Bowen, Leon

doi:10.1306/01151311163

Cited by 86 publications

(65 citation statements)

References 79 publications

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“…The shallow onset of pore fluid overpressure has been noted to enhance porosity preservation, in the Skagerrak Formation of the Central North Sea (Nguyen et al, 2013;Grant et al, 2014;Stricker and Jones 2016).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Furthermore the salt pods created facies variability between intra-and inter-pods that influenced reservoir thickness and diagenetic cementation (e.g. Nguyen et al, 2013).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Section: Diagenetic Cements and Grain Coatingsmentioning

confidence: 99%

“…Smith et al, 1993;Weibel, 1998;Swarbrick et al, 2000;Kape et al, 2010;Nguyen et al, 2013). The main diagenetic cements recognised include quartz, localised carbonate (ferroan dolomite), feldspar, and early precipitates of halite cement as identified by (Nguyen et al, 2013). Detrital quartz grains were reported to be coated by clay minerals such as chlorite and more rarely illite in the Skagerrak Formation and their presence has been correlated to low quartz cement volumes (Taylor et al, 2010;Nguyen et al, 2013;Taylor et al, 2015).…”

Section: Diagenetic Cements and Grain Coatingsmentioning

confidence: 99%

“…However, occurrences of sandstone reservoirs with higher than expected porosity are commonly attributed to conditions that limit the degree of burial compaction and/or cementation, or to pre-existing cements and grain coatings (e.g. Bloch et al, 2002;Taylor et al, 2010;Nguyen et al, 2013;Taylor et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Exceptional reservoir quality in HPHT reservoir settings: Examples from the Skagerrak Formation of the Heron Cluster, North Sea, UK

Stricker

Jones

Sathar

et al. 2016

Marine and Petroleum Geology

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(2016) 'Exceptional reservoir quality in HPHT reservoir settings : examples from the Skagerrak Formation of the Heron Cluster, UK, North Sea.', Marine and petroleum geology., 77 . pp. 198-215. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. cementation and has had little to no effect on porosity preservation. The formation of welldeveloped authigenic chlorite (>70% surface coating) and, to a lesser extent illite clay coats with burial had a positive effect on porosity preservation even though permeability was marginally reduced in the illite-rich sandstones. A schematic porosity and quartz cement evolution model has been developed which allows for pre-drill prediction of reservoir quality in the Heron Cluster and provide valuable insights for other complex high-pressure hightemperature reservoirs.

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…Furthermore the salt pods created facies variability between intra-and inter-pods that influenced reservoir thickness and diagenetic cementation (e.g. Nguyen et al, 2013).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Section: Diagenetic Cements and Grain Coatingsmentioning

confidence: 99%

Section: Diagenetic Cements and Grain Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Exceptional reservoir quality in HPHT reservoir settings: Examples from the Skagerrak Formation of the Heron Cluster, North Sea, UK

Stricker

Jones

Sathar

et al. 2016

Marine and Petroleum Geology

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Sedimentary flow heterogeneities in the Triassic U.K. Sherwood Sandstone Group: Insights for hydrocarbon exploration

2018

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Fluvial and aeolian sedimentary successions host important hydrocarbon resources as well as major groundwater aquifers. This review of the lithological characteristics of Triassic fluvio‐aeolian successions of the Sherwood Sandstone Group (United Kingdom) demonstrates how distance from a fluvial sediment source and rate of rift‐related tectonic subsidence play important roles in governing reservoir quality in continental successions. Increasing distance from the fluvial sediment source area results in increased porosity and permeability in deposits of mixed fluvial and aeolian reservoir successions that accumulated in arid and semiarid settings. Indeed, successions of the U.K. Sherwood Sandstone Group reveal an increase in the proportion of highly permeable deposits of aeolian origin with increasing distance from the principal uplands, represented by the Armorican Massif in northern France, which formed the main source for delivery of fluvial sediment to a series of rift basins. A progressive reduction in the discharge of fluvial systems entering and passing through a series of interlinked rift basins encouraged aeolian accumulation in more distal basins. Extensional tectonics enabled preservation of highly permeable aeolian facies in basins subject to high rates (≳100 m/Myr) of tectonic subsidence by rapidly placing such deposits below the water table. However, successions exclusively characterized by fluvial lithofacies record decreases in both porosity and permeability with increasing distance (~250–750 km) from the sediment source due to the coupling of porosity reduction and increasing clay content.

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Sedimentary facies and reservoir characteristics of the Western Sulige field Permian He 8 tight sandstones, Ordos Basin, China

et al. 2020

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The He 8 sandstone unit in the Western Sulige field is one of the most prolific gas‐producing intervals in the Ordos Basin. Sedimentologic and reservoir characteristics analysis were conducted to investigate the reservoir's petrological, diagenetic, petrophysical properties, and production characteristics. Three sandstone types and four lithofacies were identified. The two most commonly observed lithofacies are labelled lithofacies C and D. Lithofacies C is composed of fine‐ to medium‐grained litharenites (Sandstone I); lithofacies D includes coarse‐grained sublitharenites (Sandstone II) and coarse‐grained/gravelly litharenites (Sandstone III). Compared with Lithofacies C, Lithofacies D was deposited as a series of laminated sand sheets in a higher energy fluvial system. The tightness of Sandstone I is a result of an episode of intense compaction of the rock framework causing early‐diagenetic dissolution of grains and deformation of ductile rock fragments. The processes that led to the low permeability of Sandstone II and Sandstone III are more complex. In addition to intense compaction, the growth and emplacement of quartz and clay cements are a critical factor. Diagenesis and porosity evolution analysis show that the petrophysical properties of these sandstones were better at the gas charging time. The porosity and permeability values of Sandstones II and III are similar at surface, but significantly different at formation pressure. This leads to differences in gas production rates. Sandstone II has higher gas production rates and cumulative gas production than Sandstone III. The presence or absence of Sandstone II controls the distribution of sweet spots within less productive tight gas reservoirs.

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The role of fluid pressure and diagenetic cements for porosity preservation in Triassic fluvial reservoirs of the Central Graben, North Sea

Cited by 86 publications

References 79 publications

Exceptional reservoir quality in HPHT reservoir settings: Examples from the Skagerrak Formation of the Heron Cluster, North Sea, UK

Exceptional reservoir quality in HPHT reservoir settings: Examples from the Skagerrak Formation of the Heron Cluster, North Sea, UK

Sedimentary flow heterogeneities in the Triassic U.K. Sherwood Sandstone Group: Insights for hydrocarbon exploration

Sedimentary facies and reservoir characteristics of the Western Sulige field Permian He 8 tight sandstones, Ordos Basin, China

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