Fractal geometries of vein systems and the variation of scalingrelationships with mechanism

Johnston, Joseph; McCaffrey, K. J. W.

doi:10.1016/s0191-8141(96)80055-1

Cited by 93 publications

(48 citation statements)

References 17 publications

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“…5a-e) suggest that, initially, veins grew as self-similar structures as generally reported in the literature (e.g. Vermilye & Scholz 1995;Johnston & McCaffrey 1996;Gillespie et al 2001). However, the self-similarity was lost at more advanced growth phases, as the veins increased in length and height but not in thickness.…”

Section: Genesis and Patterns Of Gypsum Veinssupporting

confidence: 66%

Fibrous gypsum veins as diffuse features and within fault zones: the case study of the Pisco Basin (Ica desert, southern Peru)

Rustichelli

Celma

Tondi

et al. 2016

JGS

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New knowledge on patterns of fibrous gypsum veins, their genetic mechanisms, deformation style and weathering is provided by a field-and laboratory-based study carried out on the Neogene to Quaternary Pisco Basin sedimentary strata exposed in the Ica desert, southern Peru. Gypsum veins vary considerably in dimensions, attitudes and timing, and can develop in layered and moderately fractured rocks also in the absence of evaporitic layers. Veins occur both as diffuse features, confined to certain stratigraphic levels, and localized within fault zones. Arrays formed by layer-bounded, mutually orthogonal sets of steeply dipping gypsum veins are reported for the first time. Vein length, height and spacing depend on the thickness of the bed packages in which they are confined. Within fault zones, veins are partly a product of faulting but are also inherited layerbounded features along which faults are superimposed. Owing to the different petrophysical properties with respect to the parent rocks and their susceptibility to textural and mineralogical modifications, water dissolution and rupture, gypsum veins may have a significant role in geofluid management. Depending on their patterns and grade of physical and chemical alteration, veins may influence geofluid circulation and storage, acting as barriers to flow and possibly also as conduits.

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Section: Genesis and Patterns Of Gypsum Veinssupporting

confidence: 66%

Fibrous gypsum veins as diffuse features and within fault zones: the case study of the Pisco Basin (Ica desert, southern Peru)

Rustichelli

Celma

Tondi

et al. 2016

JGS

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show abstract

“…Attempts have been made to find relationships between the fracture length and aperture using positive linear correlations or power-law correlations [17][18][19][20][21]. When the fracture length and aperture are correlated, the few larger fractures with higher apertures dominate the fluid flow in a fracture system [8].…”

Section: Discussionmentioning

confidence: 99%

“…Observations of fracture properties based on the results of field mapping have led researchers to propose a relationship between the fracture trace length and aperture [17][18][19][20]. It was reported that the relation between the length and width (aperture) must be considered probabilistically [17].…”

Section: Correlation Between Fracture Aperture and Lengthmentioning

confidence: 99%

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Modeling the Hydraulic Characteristics of a Fractured Rock Mass With Correlated Fracture Length and Aperture: Application in the Underground Research Tunnel at Kaeri

Bang¹,

Jeon²,

Kwon³

2012

Nuclear Engineering and Technology

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“…Many researchers such as Stone (1984), Vermilye et al (1995) and Johnston and Mccaffrey (1996), through observation of fracture properties from field mapping, have proposed a power-law correlation between aperture h and fracture length 1 (Equation 2.2 …”

Section: Discontirluitiesmentioning

confidence: 99%

Further Development and Application of GEOFRAC-FLOW to a Geothermal Reservoir

VecchiarelliI¹

2014

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GEOFRAC is a three-dimensional, geology-based, geometric-mechanical, hierarchical, stochastic model of natural rock fracture systems. The main characteristic of GEOFRAC is that is based on statistical input representing fracture patterns in the field in form of the fracture intensity P32 (fracture area per volume) and the best estimate fracture size E(A). Recent developments in GEOFRAC allow the user to calculate the flow in a fractured medium. For this purpose the fractures are modeled as parallel plates and the flow rate can be calculated using the Poisseuille equation. This thesis explores the possibility of the application of GEOFRAC to model a geothermal reservoir. After modeling the fracture flow system of the reservoir, it is possible to obtain the flow rate in production. A parametric study was conducted in order to check the sensitivity of the output of the model and to explain how aperture, width and rotation (orientation distribution) of the fractures influence the resulting flow rate in the production well. A case study is also presented in this thesis in order to confirm the applicability of GEOFRAC to a real case.GEOFRAC is a structured MATLAB code composed of more than 100 functions. Examples on how to obtain P 3 2 and E(A) from fracture trace lengths on outcrops are presented in the Appendix 1. A GUI was created in order to make GEOFRAC more accessible to the users. It should also be kept in mind that future improvements are the keys for a powerful tool that will let GEOFRAC to be used to optimize the location of the injection and production well in a geothermal system.

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Fractal geometries of vein systems and the variation of scalingrelationships with mechanism

Cited by 93 publications

References 17 publications

Fibrous gypsum veins as diffuse features and within fault zones: the case study of the Pisco Basin (Ica desert, southern Peru)

Fibrous gypsum veins as diffuse features and within fault zones: the case study of the Pisco Basin (Ica desert, southern Peru)

Modeling the Hydraulic Characteristics of a Fractured Rock Mass With Correlated Fracture Length and Aperture: Application in the Underground Research Tunnel at Kaeri

Further Development and Application of GEOFRAC-FLOW to a Geothermal Reservoir

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