Pore-throat characterization in highly porous and permeable sandstones

Nabawy, Bassem S.; Géraud, Yves; Rochette, P.; Bur, Nicolas

doi:10.1306/03160908131

Cited by 86 publications

(49 citation statements)

References 16 publications

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“…The close fit of the 87 Sr/ 86 Sr ratios to the Oligo-Miocene seawater curve (Fig. 3C) suggests little Sr enrichment of the seawater by fluid-rock interaction during convection, consistent with the inert, quartz-rich composition of the Nubian Sandstone (Nabawy et al, 2009). On reaching the HFF, buoyant, hot fluids could have escaped upwards to discharge laterally into the lower Thebes Formation at the fault tip.…”

Section: Mechanism For Fluid Flux and Dolomitizationsupporting

confidence: 58%

“…Seawater could have been drawn down the discrete, surface-breaching faults (Fig. 4A) and fluxed into the Nubian Sandstone, the principal aquifer in the region today with permeabilities of several darcys (Nabawy et al, 2009). There, seawater could have been entrained into free convection cells, enhanced by a high heat flux due to rifting (e.g., Garven et al, 1999).…”

Section: Mechanism For Fluid Flux and Dolomitizationmentioning

confidence: 99%

“…The partially dolomitized Eocene (Ypresian) Thebes Formation (Fig. 1B) is exposed in the footwall, overlying the Paleocene Esna Shale, carbonatedominated Cretaceous strata, and the Paleozoic Nubian Sandstone, composed largely of quartz arenite (Nabawy et al, 2009). The overlying syn-rift succession is dominantly siliciclastic, overlain by Miocene evaporites (Moustafa, 2003).…”

Section: Introduction and Geological Settingmentioning

confidence: 99%

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Fault-controlled dolomitization in a rift basin

Hollis¹,

Bastesen²,

Boyce³

et al. 2017

Geology

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There are numerous examples of fault-controlled, so-called hydrothermal dolomite (HTD), many of which host economic mineral deposits or hydrocarbons, but there remains a lack of consensus as to how they form. In particular, multiple phases of diagenetic overprinting can obscure geochemical fingerprints. Study of a Cenozoic succession with a relatively simple burial history here provides new insights into the development of differentially dolomitized beds. The Hammam Faraun fault (HFF) block within the Suez Rift, Egypt, hosts both massive and stratabound dolostone bodies. Non-fabric-selective massive dolostone is limited to the damage zone of the fault, while fabric-selective stratabound dolostone bodies penetrate nearly 2 km into the footwall. Oligo-Miocene seawater is interpreted to have been drawn down discrete faults into a deep aquifer and convected upwards along the HFF. Escape of fluids from the incipient HFF into the lower Thebes Formation led to differential, stratabound dolomitization. Once the HFF breached the surface, fluid circulation focused along the fault plane to form younger, massive dolostone bodies. This study provides a snapshot of dolomitization during the earliest phases of extension, unobscured by subsequent recrystallization and geochemical modification. Contrary to many models, stratabound dolomitization preceded non-stratabound dolomitization. Fluids were hydrothermal, but with little evidence for rapid cooling and brecciation common to many HTD bodies. These results suggest that many of the features used to interpret and predict the geometry of HTD in the subsurface form during later phases of structural deformation, perhaps overprinting less structurally complex dolomite bodies.

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Section: Mechanism For Fluid Flux and Dolomitizationsupporting

confidence: 58%

Section: Mechanism For Fluid Flux and Dolomitizationmentioning

confidence: 99%

Section: Introduction and Geological Settingmentioning

confidence: 99%

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Fault-controlled dolomitization in a rift basin

Hollis¹,

Bastesen²,

Boyce³

et al. 2017

Geology

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“…That is, most samples (87%) belong to reservoir sandstone with micro-throat, micro-fine throat or fine throat. Previous studies showed that permeability is closely related to pore structure (Nabawy et al, 2009). In Zhang-Han oilfield, the occurrence of necking, flaky and curved lamellar throats could increase the camber and coarseness of the pore, so that permeability values of reservoir sandstone are reduced easily.…”

Section: Throat Typesmentioning

confidence: 99%

Physical Property and Origin of Lowly Permeable Sandstone Reservoir in Chang 2 Division, Zhang-Han Oilfield, Ordos Basin

Gao

Wang

Deng

et al. 2009

Energy Exploration & Exploitation

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Lowly permeable sandstone reservoirs play an important role in the exploration and exploitation of natural gas and petroleum in China. The reservoirs are major lowly permeable sandstone reservoirs in Chang 2 division, Yanchang Formation, Upper Triassic in Zhang-Han oilfield, which located in the northern Shaanxi slope of Ordos Basin. According to the distribution and composition of sand beds, integrated measured physical properties, micro-pore structure analysis, cast thin section observation, scanning electron microscopy, the impacts of deposition and diagenesis on porosity evolution are analyzed. The essential diagenesis causing the porosity loss is evaluated quantitatively, and finally the origin mechanisms of low permeability reservoir in Zhang-Han oilfield are discussed. The results show: (1) Fine particle and low compositional maturity arkose are the material foundation of the formation of poor physical property sandstone; (2) The main pore space of reservoir is secondary pores. There are two types of combined pores that including dissolve-residual pores and dissolve-micropores. The porosity values display an approximately normal distribution, and permeability values are asymmetric distribution of the logarithm in lowly permeable sandstones. Their correlation coefficient becomes more and more worse with the decrease of permeability; (3) There are four diagenetic facies, in which three diagenetic facies belong to extra-lowly permeable and ultra-lowly permeable reservoir sandstones and widely distributed, and they are diagenetic lithofacie background of lowly permeability sandstone; (4) In low compositional maturity arkose, its initial porosity is 1/4 lower than conventional reservoir, the secondary and dissolved pores are main pore types of lowly permeable reservoir rocks. It is also a key factor of effective oil-bearing of lowly permeability sandstone.

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“…MICP, testing the capillary pressure and mercury saturation, can obtain pore-size distribution by calculation of Washburn [9] equation and more detailed parameters of the pore-throat network, such as threshold pressure as defined by Katz and Thompson [30] and displacement pressure as defined by Schowalter [31]. This technique was used by lots of scholars to research the pore-throat structures and try to relate these characteristics to simple and easy obtained parameters, such as permeability and porosity, and further to estimate the reservoir quality for economic fluid pay [32][33][34][35]. With the increase of unconventional hydrocarbon resource exploitation in recent years, some applications have to be conducted in the tight fine-grained sandstone, siltstone, carbonate rocks, and shale [3,15,28,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

The Controls of Pore-Throat Structure on Fluid Performance in Tight Clastic Rock Reservoir: A Case from the Upper Triassic of Chang 7 Member, Ordos Basin, China

et al. 2018

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The characteristics of porosity and permeability in tight clastic rock reservoir have significant difference from those in conventional reservoir. The increased exploitation of tight gas and oil requests further understanding of fluid performance in the nanoscale pore-throat network of the tight reservoir. Typical tight sandstone and siltstone samples from Ordos Basin were investigated, and rate-controlled mercury injection capillary pressure (RMICP) and nuclear magnetic resonance (NMR) were employed in this paper, combined with helium porosity and air permeability data, to analyze the impact of pore-throat structure on the storage and seepage capacity of these tight oil reservoirs, revealing the control factors of economic petroleum production. The researches indicate that, in the tight clastic rock reservoir, largest throat is the key control on the permeability and potentially dominates the movable water saturation in the reservoir. The storage capacity of the reservoir consists of effective throat and pore space. Although it has a relatively steady and significant proportion that resulted from the throats, its variation is still dominated by the effective pores. A combination parameter ( ) that was established to be as an integrated characteristic of pore-throat structure shows effectively prediction of physical capability for hydrocarbon resource of the tight clastic rock reservoir.

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Pore-throat characterization in highly porous and permeable sandstones

Cited by 86 publications

References 16 publications

Fault-controlled dolomitization in a rift basin

Fault-controlled dolomitization in a rift basin

Physical Property and Origin of Lowly Permeable Sandstone Reservoir in Chang 2 Division, Zhang-Han Oilfield, Ordos Basin

The Controls of Pore-Throat Structure on Fluid Performance in Tight Clastic Rock Reservoir: A Case from the Upper Triassic of Chang 7 Member, Ordos Basin, China

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