Effect of Grain Size in Granitic Rocks on Hydraulic Fracturing Mechanism

2000 ◽  
Author(s):  
Tsuyoshi Ishida ◽  
Shunji Sasaki ◽  
Isao Matsunaga ◽  
Qu Chen ◽  
Yoshiaki Mizuta
Keyword(s):  
Grain Size ◽  
Hydraulic Fracturing ◽  
Granitic Rocks ◽  
Fracturing Mechanism

scholarly journals Influence of Grain Size of Granite on Hydraulic Fracturing Mechanism.

1998 ◽  
pp. 179-194 ◽  
Author(s):  
Qu Chen ◽  
Tsuyoshi Ishida ◽  
Shunji Sasaki ◽  
Isao Matsunaga ◽  
Yoshiaki Mizuta
Keyword(s):  
Grain Size ◽  
Hydraulic Fracturing ◽  
Fracturing Mechanism

Layered Granitic Rocks at Chebucto Head, Halifax County, Nova Scotia

1975 ◽  
Vol 12 (3) ◽  
pp. 456-463 ◽  
Author(s):  
T. E. Smith
Keyword(s):  
Grain Size ◽  
Nova Scotia ◽  
Granitic Rocks ◽  
Textural Characteristics ◽  
Rock Types ◽  
Flow Sorting

Structural, mineralogical and textural characteristics of some layered granitic rocks are described. The layers result from the segregation of minerals into bands and lenses of contrasting color and grain size. They were formed near the roof of the pluton prior to final crystallization by flow sorting during episodic shearing generated during intrusion. Comparison of the mineralogy and textures of the layered rocks with those of the main rock types of the pluton shows that the differentiation of the pluton as a whole took place after the formation of the layers by interaction of felsic components concentrated in residual liquids with earlier formed crystals.

A Discussion on global tectonics in Proterozoic times - The interrelations of fluid transport, deformation, geochemistry and heat flow in early Proterozoic shear zones in the Lewisian complex

1976 ◽  
Vol 280 (1298) ◽  
pp. 569-604 ◽  
Keyword(s):  
Grain Size ◽  
Heat Flow ◽  
Hydraulic Fracturing ◽  
Fluid Transport ◽  
Shear Zones ◽  
Size Reduction ◽  
Dyke Swarm ◽  
Large Temperature ◽  
Early Proterozoic ◽  
General Chemical

The Lewisian complex of northwest Scotland shows a pattern of evolution typical of a number of early Proterozoic provinces. During the period 2500-1600 Ma, deformation occurred along steeply dipping shear zones, resulting in both vertical and lateral movements. The largest of these shear zones, forming the northern boundary to the Scourian granulites (Archaean), must have penetrated to considerable depth, possibly to the mantle. Modal and chemical analysis of rocks from shear zones are presented and discussed in relation to rocks sampled outside shear zones. The mineralogy and composition of all rocks deformed in the shear zones have been considerably altered by synkinematic metasomatism. In the early stages, immediately prior to and during the intrusion of the regional doleritic dyke swarm, this metasomatic activity involved addition of H 2 O and Na to the rocks. Subsequently, more significant changes in rock chemistry occurred addition of H 2 O, K, Na, loss of Fe, Ca, Mg). These changes resulted from the interaction between large volumes of water and the rocks in the shear zones along which the fluid travelled. A combination of modal and chemical data allow general chemical reactions to be written which describe the evolution of the gneisses during reworking and retrogression from pyroxene bearing granulite facies rocks to hornblende and biotite bearing amphibolite facies rocks in shear zones. The reactions are written as ionic equilibria and suggest that the fluid phase in the shear zones had a low pH. Adiabatic transport of water upwards through the crust will result in moderate warming of the fluid, and can cause large temperature increases above the preexisting geothermal gradient in rocks through which the fluid travels. It is suggested that both deformation and metamorphism in these shear zones are related to transport of fluid by hydraulic fracturing. Grain size reduction by hydraulic fracturing increases the strain rate in the shear zones. Deformation may cease in a shear zone when the fluid pressure drops and hydraulic fracturing no longer occurs. Thus fluid transport, mineral reactions, chemical changes, grain size reduction and convective heat flow will cease. A close relation should exist between the intensity of deformation, the extent of metasomatism and the thermal history in these important shear belts.

A Numerical Investigation of the Hydraulic Fracturing Mechanism in Oil Sands

2014 ◽  
Author(s):  
Siavash Taghipoor ◽  
Morteza Roostaei ◽  
Alireza Nouri ◽  
Dave Chan
Keyword(s):  
Hydraulic Fracturing ◽  
Numerical Investigation ◽  
Oil Sands ◽  
Fracturing Mechanism

Análise Comparativa entre a Resistência à Tração na Flexão e Compressão da Argamassa Convencional e Argamassa com Adição de Pó de Brita Granítica

2018 ◽  
Vol 21 (3) ◽  
pp. 161
Author(s):  
Jessica Pereira da Silva ◽  
Dahiane Dos Santos Oliveira Zangeski ◽  
Dayane Ferreira Nascimento ◽  
Jonathan Willian Zangeski Novais ◽  
Renata Luisa Ferreira ◽  
...  
Keyword(s):  
Grain Size ◽  
Mass Density ◽  
Raw Material ◽  
Granitic Rocks ◽  
Crushed Stone ◽  
Design Strength ◽  
Environmental Preservation ◽  
Quarry Fines ◽  
Lime Powder ◽  
The Comparative Study

Os finos de pedreira que resultam da britagem de rochas graníticas, geralmente, são descartados e ficam estocados, ocupando áreas desnecessárias em pedreiras e expostas ao vento, chuva. Diante dessa situação, observa-se um desperdício da matéria-prima e visando a preservação ambiental se percebe a alternativa de empregar o pó de brita como agregado artificial em argamassa de revestimento. Para melhor entendimento dessa possibilidade, o artigo referenciou ao estudo comparativo da resistência à compressão e tração entre a argamassa convencional e a argamassa com adição de 20% de pó de brita granítica, confeccionados de acordo com os requisitos solicitados pela NBR 13281. Os dados foram obtidos pela ruptura de 12 corpos de prova cilíndricos e 12 corpos de prova prismáticos, nas idades de 7, 14, 21 e 28 dias, para ambos os tipos de argamassas, que foram dimensionadas com a resistência de projeto de 20 MPa, com o traço em volume para argamassa convencional de 1: 3,2: 0,4 (cimento, areia e cal hidratada) e para argamassa com adição de pó de brita de 1: 2,56: 0,64: 0,4 (cimento, areia, pó de brita e cal). Os resultados comprovaram que a resistência da argamassa com adição de pó de brita granítica se demostrou mais elevada. Palavras-chave: Finos de Pedreira. Granulometria. Densidade da Massa Fresca.AbstractQuarry fines resulting from the crushing of granitic rocks are usually discarded, stored in unnecessary quarry areas and exposed to wind, rain. Faced with this situation, a waste of the raw material is observed and environmental preservation is perceived as the alternative to use the crushed stone powder as an artificial aggregate in coating mortar. For a better understanding of this possibility, the article referred to the comparative study of the compressive strength and tensile strength between the conventional mortar and the mortar with the addition of 20% granite gravel powder, made according to the requirements of NBR 13281. The data were obtained by the rupture of 12 cylindrical specimens and 12 prismatic specimens, at the ages of 7, 14, 21 and 28 days, for both types of mortars, which were dimensioned with a design strength of 20 MPa, (Cement, sand and lime hydrate) and for mortar with addition of crushed stone powder of 1: 2.56: 0.64: 0.4 ( Cement, sand, gravel and lime powder). The results showed that the strength of the mortar with the addition of granite gravel powder was higher.Keywords: Quarry Fines. Grain Size. Fresh Mass Density.

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