How well can we predict permeability in sedimentary basins? Deriving and evaluating porosity–permeability equations for noncemented sand and clay mixtures

Luijendijk, Elco; Gleeson, Tom

doi:10.1002/9781119166573.ch10

Cited by 9 publications

(7 citation statements)

References 26 publications

(53 reference statements)

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“…It is found that the gradient of water pressure is the main factor for sand inrush. Some researchers investigated the permeability of sedimentary basins for water and sand movement and proposed some models to determine the permeability based on the porosity [10,11]. Since there are always broken rock layers and granular rock mass around the goaf, the permeability of this area plays an important role in controlling the water and sand movement.…”

Section: Introductionmentioning

confidence: 99%

Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Zhang

Liu

et al. 2017

Geofluids

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Water and sand inrush is one of the most serious threats in some shallow coal mines in China. In order to understand the process of sand inrush, experiments were performed to obtain the criterion for sand inrush. First, seepage tests were carried out to study the hydraulic properties of granular sandstone. The results indicate that seepage velocity has a linear relation with the porosity and particle-size distribution parameter. Then, sand inrush tests were conducted to investigate the critical conditions for sand inrush occurrence. It is determined that the sand inrush zone can be clearly distinguished based on the values of porosity and particle-size distribution parameter. Additionally, sand inrush tended to happen in the conditions of high porosity, high seepage velocity, and large particle-size distribution parameter. Further, general principles for preventing the water and sand inrush were proposed, such as reducing the porosity, improving the pore structure, and decreasing the seepage velocity. The proposed principles have been successfully used in situ to control the water and sand inrush.

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Section: Introductionmentioning

confidence: 99%

Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Zhang

Liu

et al. 2017

Geofluids

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“…Permeability anisotropy (the ratio of horizontal over vertical permeability) was kept constant at a value of 10. For fractured crystalline rocks vertical permeability may exceed horizontal permeability, whereas for layered sediment sequences anisotropy can reach a factor of 100 or more 64 . We used a constant anisotropy value of 10 to strike a balance between these two end-members.…”

Section: Methodsmentioning

confidence: 99%

Fresh groundwater discharge insignificant for the world’s oceans but important for coastal ecosystems

2020

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The flow of fresh groundwater may provide substantial inputs of nutrients and solutes to the oceans. However, the extent to which hydrogeological parameters control groundwater flow to the world's oceans has not been quantified systematically. Here we present a spatially resolved global model of coastal groundwater discharge to show that the contribution of fresh groundwater accounts for~0.6% (0.004%-1.3%) of the total freshwater input and~2% (0.003%-7.7%) of the solute input for carbon, nitrogen, silica and strontium. However, the coastal discharge of fresh groundwater and nutrients displays a high spatial variability and for an estimated 26% (0.4%-39%) of the world's estuaries, 17% (0.3%-31%) of the salt marshes and 14% (0.1-26%) of the coral reefs, the flux of terrestrial groundwater exceeds 25% of the river flux and poses a risk for pollution and eutrophication.

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“…The permeability of clastic sediments in the cool uppermost crust (0-2000 m depth) is often well constrained by a function of mechanical compaction (e.g. Daigle & Screaton, 2016;Luijendijk & Gleeson, 2016). However, the predictability for porosity-permeability relations diminishes at depths where diagenesis becomes important (Mountjoy et al, 2001).…”

Section: Crustal Permeability and Geothermal Play Typesmentioning

confidence: 99%

Geothermal play typing in Germany, case study Molasse Basin: a modern concept to categorise geothermal resources related to crustal permeability

Moeck

Dussel

Weber

et al. 2019

Netherlands Journal of Geosciences

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The majority of running geothermal plants worldwide are located in geological settings with convection- or advection-dominant heat transport. In Germany as in most regions in Europe, conduction is the dominating heat transport mechanism, with a resulting average geothermal gradient. The geothermal play type concept is a modern methodology to group geothermal resources according to their geological setting, and characteristic heat transport mechanisms. In particular, the quantity of heat transport is related to fluid flow in natural or engineered geothermal reservoirs. Hence, the permeability structure is a key element for geothermal play typing. Following the existing geothermal play type catalogue, four major geothermal play types can be identified for Germany: intracratonic basins, foreland basins and basement/crystalline rock provinces as conduction-dominated play types, and extensional terrains as the convection-dominated play type. The installed capacity of geothermal facilities sums up to 397.1 MWth by the end of 2018. District heating plants accounted for the largest portion, with about 337.0 MWth. The majority of these installations are located in the play type ‘foreland basin’, namely the Molasse Basin in southern Germany. The stratigraphic unit for geothermal use is the Upper Jurassic, also known as ‘Malm’ formation, a carbonate reservoir with high variability in porosity and permeability. Recently drilled wells in the southernmost Molasse Basin indicate the Upper Jurassic as a tight, fracture-controlled reservoir, not usable for conventional hydrothermal well doublets. Our new data compilation including the recently drilled deep geothermal well Geretsried reveals the relation of porosity and permeability to depth. The results suggest that obviously diagenetic processes control permeability with depth in carbonate rock, diminishing the predictability of reservoir porosity and permeability. The play type concept helps to delineate these property variations in play type levels because it is based on geological constraints, common for exploration geology. Following the general idea of play typing, the results from this play analysis can be transferred to geological analogues as carbonate rock play levels in varying depth.

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How well can we predict permeability in sedimentary basins? Deriving and evaluating porosity–permeability equations for noncemented sand and clay mixtures

Cited by 9 publications

References 26 publications

Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Fresh groundwater discharge insignificant for the world’s oceans but important for coastal ecosystems

Geothermal play typing in Germany, case study Molasse Basin: a modern concept to categorise geothermal resources related to crustal permeability

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