Diagenetic Controls on Reservoir Quality, Eolian Norphlet Formation, South State Line Field, Mississippi

Thomson, Alan; Stancliffe, Richard J.

doi:10.1007/978-1-4613-8988-0_10

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…Where VRFs were not co-deposited within sands, chlorite-coats did not form and quartz overgrowths were able to develop and fill the pore space. Thomson and Stancliffe (1990) argued that VRFs are the most likely source for magnesium to allow the development of chlorite in the Norphlet Formation. Chlorite in the Central Graben, UK North Sea was interpreted to have developed from a smectite precursor aided by the dissolution of detrital grains (Humphreys et al, 1989).…”

Section: Diagenetic Chlorite-coats Formed From the Dissolution Of Detmentioning

confidence: 98%

Pre-requisites, processes, and prediction of chlorite grain coatings in petroleum reservoirs: A review of subsurface examples

Dowey

Hodgson

Worden

2012

Marine and Petroleum Geology

123

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Section: Diagenetic Chlorite-coats Formed From the Dissolution Of Detmentioning

confidence: 98%

Pre-requisites, processes, and prediction of chlorite grain coatings in petroleum reservoirs: A review of subsurface examples

Dowey

Hodgson

Worden

2012

Marine and Petroleum Geology

123

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“…Heald and Larese, 1974;Storvoll et al, 2002) have asserted that sandstones with illite coats have low quartz cement and high porosity; on the other hand, many more studies have indicated that illite coats have enhanced pressure solution between quartz grains, causing more porosity loss (e.g. Bjørkum, 1996;Oelkers et al, 1996;Thomson and Stancliffe, 1990;Walderhaug, 1994). In the case of the Kessog Field, quartz cement is not observed on the surface of quartz grains that are covered by thick illite coats (>10 μm, e.g.…”

Section: Possible Cause Of High Porositymentioning

confidence: 99%

Petroleum emplacement inhibits quartz cementation and feldspar dissolution in a deeply buried sandstone

Xia

Wilkinson

Haszeldine

2020

Marine and Petroleum Geology

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Whether the emplacement of petroleum in sandstone reservoirs can preserve porosity during burial remains controversial. In the Kessog Field, UK Central North Sea, average porosities of the crestal sections of the fluvial-deltaic Pentland Formation reservoir can exceed 25 % despite burial to 4 km or more. The predicted porosity for the reservoir at this depth is only around 14 % based on regional data. Oil saturation data, thin-section point counts, grain-size and sorting measurements, reservoir pressure, and SEM images were combined to analyze the cause of the high reservoir porosity. Petroleum emplacement preventing cementation is the most likely mechanism for porosity preservation. Facies variation is not responsible, as the high-porosity sandstones from the crestal well are, in terms of average grain-size (fine-grained) and sorting coefficient (moderately well-sorted), nearly the same as the lower porosity sandstones from the flanks of the field (average porosity 13 -15%). Other potential porosity-preservation mechanisms, such as overpressure, grain-coats and feldspar dissolution can be discounted. The sandstones with high oil saturations are characterized by: 1) most porosity being primary as opposed to secondary; 2) there being 2 -5 % less quartz cement than in the water-saturated sandstones; 3) there being 2 -3 % more Kfeldspar and 2 -6 % less kaolin than the water-saturated counterparts. This study demonstrates that petroleum emplacement can effectively inhibit quartz cementation and K-feldspar transformation to kaolin in sandstone reservoirs.

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“…1. Occurrences of deep, anomalously porous chlorite-rich sandstones from the Santos Basin (Anjos et al 2003), the North Sea (Ehrenberg 1993), the Tuscaloosa (Thomson 1982;Weedman et al 1996) and the Norphlet formations (Dixon et al 1989;Thomson & Stancliffe 1990), as compared to the steep trends of porosity decline with depth in various basins. The points of the Santos Basin sandstones are average values of four different boreholes.…”

Section: Santos Basin Sandstonesmentioning

confidence: 99%

Origin and impact of authigenic chlorite in the Upper Cretaceous sandstone reservoirs of the Santos Basin, eastern Brazil

Bahlis

Ros

2013

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Upper Cretaceous sandstones are the main clastic reservoirs of the Santos Basin, eastern Brazil, showing high porosity at depths greater than 4000 m. Porosity preservation in these deep sandstones is ascribed to the inhibition of quartz cementation and pressure dissolution by authigenic pore-lining chlorite. Santos sandstones are mostly fine-grained, lithic arkoses, rich in volcanic rock fragments (VRF). Chlorite, the most abundant diagenetic constituent, occurs as coatings, rims, rosettes and replacing grains. Chlorite precipitation was favoured by the presence of eodiagenetic smectite coatings and by the abundance of VRF. Detrital heavy minerals, biotite and mud intraclasts were also sources and/or substrates for chlorite authigenesis. The chloritization of VRF, biotite and heavy minerals resulted in precipitation of abundant TiO 2 minerals. Fluid flow patterns, burial and thermal history also played a role in chlorite authigenesis and reservoir quality evolution. Discontinuous and thin coatings and rims were not effective in inhibiting quartz cementation, while those too thick severely reduced the permeability. The rosette aggregates exerted no inhibition on quartz cementation, while reducing intergranular porosity. Systematic studies are necessary for modelling the diagenetic patterns of Santos Basin sandstones, in order to contribute to the reduction of risks involved in the exploration of these reservoirs.

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Diagenetic Controls on Reservoir Quality, Eolian Norphlet Formation, South State Line Field, Mississippi

Cited by 8 publications

References 7 publications

Pre-requisites, processes, and prediction of chlorite grain coatings in petroleum reservoirs: A review of subsurface examples

Pre-requisites, processes, and prediction of chlorite grain coatings in petroleum reservoirs: A review of subsurface examples

Petroleum emplacement inhibits quartz cementation and feldspar dissolution in a deeply buried sandstone

Origin and impact of authigenic chlorite in the Upper Cretaceous sandstone reservoirs of the Santos Basin, eastern Brazil

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