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The U.S. Department of Energy's Office of Scientific and Technical Information
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In China, tight sandstones are defined as reservoirs with the porosity of 10%, and gas permeability 1 10 −3 m 2 [ 3, 4 ]. The tight reservoir has extremely low porosity and permeability, so it has no natural capacity. Generally, the development of tight oil requires volumetric fracturing to obtain an industrial oil stream [ 5 ].
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the risk characteristics of these three stages were analyzed, and the risk factors were summarized into the following six categories: (1) risks of laws, regulations and policies; (2) risks of resource characteristics; (3) risks of engineering and technology; (4) risks of economic operations; (5) risks of organization and management; and (6) risks
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Temperature changes have been reported to have great impact upon many rocks but there are also some rocks which are least affected by temperature changes such as clastic sedimentary rocks (e.g., shales and sandstones) because the particles are separated by thin cementing laminae of silica.
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First, increased stress, related to the depth of burial and the weight of the overburden, exerts a clamping force that causes the closure of cracks or fractures (decreases fracture aperture). In some types of rock – most notably limestones – chemical weathering occurs via dissolution as water flows along and through fractures.
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tests on weak sandstones from the Kweichulin Formation and the Shihti Formation in the eastern part of the Taipei Basin and attempts to quantify the relative importance of the different factors affecting their compressive strength using multiple regression analyses. Geological conditions The study area is located near the intersection of the hilly
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The potential factors that influence the richness and diversity of such microbial microplastic communities are also evaluated. Microbe-microbe and microbe-substrate interactions in microplastic biofilms have been little studied and are not well understood.
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Wind speed seems to be the major factor affecting the modelling of the pattern described. Other micro-scale characteristics of the rain in the area are being related to broad-scale synoptic features. The results of the study are thought to be relevant to the theory of partial-area contribution to runoff. RESUME LA DISTRIBUTION DE LA PLUIE SUR
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09/01/2022mercantilist insistence on the importance of a healthy labour force for a healthy economy was specifically voiced in the preamble of the 1765 act but it was a sentiment which certainly predated it. 17 geary points to dublin's rising population as a factor, for the population of dublin more than doubled in the first half of the eighteenth century.
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Englung, J.O. and Jorgensen, P. (1973) A Chemical Classification System for Argillaceous Sediments and Factors Affecting Their Composition. Geologiska Foreningen i Stockholm Forhandlingar, 95, 87-97.
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Factors affecting uranium adsorption on aquifer sandstone HUI Shujun 1 (), YANG 1, 2, GUO Huaming 1, * (), LIAN Guoxi 2, SUN Juan 2 1. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China 2. The Fourth Research and Design Engineering Corporation of CNNC, Shijiazhuang 050021,
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the extensive orogeny, faulting, erosion, and and a relative absence of tafoni, when compared to the slower, less weathering that followed produced steep-walled valleys linked to 'weatherable' umm ishrin sandstones. the seismic
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Because of the hardness of individual grains, uniformity of grain size and friability of their structure, some types of sandstone are excellent materials from which to make grindstones, for sharpening blades and other implements. Conclusion Sandstone is a versatile building structure and has been used to construct buildings, statues, and fountains.
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Several factors have been reported to affect Equotip hardness 35 measurements on samples of rocks and building stones, including proximity to the edge iew 36 37 of blocks, block dimensions (including thickness), moisture contents, porosity and surface 38 39 roughness.
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12/04/2021Factors Affecting Soil Development. Soil research has shown that soil profiles are influenced by five separate, yet interacting, factors: parent material, climate, topography, organisms, and time. Soil scientists call these the factors of soil formation. These factors give soil profiles their distinctive character. Parent Material. Get price
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29/12/2020we analyzed the influential factors of physical properties, the mechanism of tightness, and favorable accumulation space of tight sandstone reservoir by various kinds of tests, such as casting thin slices (cts), scanning electron microscope (sem), cathodoluminescence (cl), x-ray diffraction (xrd), high-pressure mercury intrusion (hpmi),
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1 strong qualitative and quantitative market analysis based on the segment breakdown within the consideration of both economic as well as non-economic factors. market evaluation based on market
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Firstly, this was investigated by introducing a wing crack propagation model showing how upper limit stresses, stress differences and other factors affect the fatigue life of sandstone. Secondly, a fatigue life prediction formula was deduced by combining it
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(27) Teng et al. concluded that gas pyrolysis, heat removal of water and volatile matter content, and thermal fracture of matrix are the main factors accounting for increasing coal porosity and permeability. (28) In addition, injecting heat into the coal seam can effectively increase the production of CBM.
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With humidity cycling, recrystallization promotes the formation of localised bigger cubic crystals at the subsurface of the stone whereas rewetting leads to efflorescence in the form of large localised cauliflowers at the surface. The different growth dynamics also affects the drying behaviour of the sandstones.
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18/06/2021The effects of injection intensity, horizontal in-situ stresses, natural fracture density and perforation cluster spacing on fracture propagation are analyzed. The results show that: (1) Increasing the injection scale of fracturing fluid in a single stage can significantly increase the fracture volume.
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04/01/20171. Economic Factor The most important and first on this list is the Economic Factor. This one is the main foundation of any purchasing decision. The reason is simple people can't buy what they
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02/01/2018The sandstone reservoirs are characterized by poor reservoir properties and low oil saturations. Reservoir properties between laboratory pressure conditions and in situ conditions are approximately the same, and oil saturations are not
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Likewise, a subtle pattern in your sandstone may become objectionably bold when accentuated by moisture. Аналогичным образом, тонкий рисунок в вашем песчанике может стать нежелательно жирным, если подчеркнуть его влажность.
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Formation Resistivity Factor Porosity and Permeability. The formation resistivity factor measure the influence of pore structure on the resistance of sample. The Formation Resistivity Factor F is an intrinsic property of a porous insulating medium related to the degree of efficiency or inefficiency for the electrolyte-filled paths to conduct. For clean-sand laminae,, where Fsd is
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Smallholders contribute around 50% of the national production of such a crop ( Puyana, 2012; Gonzlez-Ortega et al., 2017 ), in addition to supporting self-sufficiency to millions of peasant families and for diversifying their livelihood options ( Bellon et al., 2018 ).
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Exfoliation in the archaeological field represents one of the most recognizable weathering symptom not tied to differential erosion that affect several kinds of stones especially basalt and granite through different mechanisms ‐physical, chemical and biological (El-Gohary, M., 2010- MAA)
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Some of the factors that influence the mercury capillary pressure data of sandstone and carbonate rocks were investigated. These factors include sample size, existence of epoxy coating, and equilibration time. The experimental results show that mercury injection capillary pressure curves are insensitive to the sample size of sandstone samples.
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11/11/2022The influences of the number of freeze–thaw cycles and strain rate on strength characteristics, energy dissipation rate and the fractal dimension characteristics of sandstone were evaluated. Based on the peak energy dissipation rate, a freeze–thaw damage variable was established.
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The Common Sagebrush Lizard lacks the broad flattened body and the fringe of prominent spines on each side of the body that is present in the Greater Short-horned Lizard, the only other Montana lizard with which it overlaps in range. The Northern Alligator Lizard has a prominent skin fold on the side of the body; the Western Skink has smooth
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2 such factors include, without limitation: the company's dependence on one mineral project; precious metals price volatility; risks associated with the conduct of the company's mining activities;
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2 such risks - and other factors include, among others: social and economic impacts of covid-19; actual exploration results; changes in project parameters as plans continue to be refined; results of future mineral resource estimates; future metal prices; availability of capital and financing on acceptable terms; general economic, market or business
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Figure 1 Flow chart showing the interrelationship of depositional environment with the many factors controlling sandstone diagenesis. After Stonecipher et al. [1] Contents 1 Sediment texture and composition 2 Depositional pore-water chemistry 3 Marine pore-water chemistry 4 Marine diagenesis 5 Nonmarine pore-water chemistry and cements 6 Cements
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In this study, we investigated the effect of on the behavior of both P c and RI curves in sandstone and carbonate rocks using both porous plate and two-pole resistivity methods at ambient temperature. Our results consistently showed that for a given water saturation (S w ), the RI of a rock increases in the presence of than without .
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16/08/2019the excavation damaged zone (edz) is affected by multiple factors, such as unloading rate, rock lithology, tunnel shape, and in situ stresses. 40 - 42 it is widely confirmed that tunnel shape plays an important role in affecting the failure intensity and destruction area of tunnels at great depth. 23 - 25, 43, 44 this is primarily because the
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06/07/2022The toxicity of a substance usually depends on the following factors: Form and innate chemical activity Dosage, especially dose -time relationship Exposure route Species Life stage, such as infant, young adult, or elderly adult Gender Ability to be absorbed Metabolism Distribution within the body Excretion
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Factors affecting sandstone compaction, cementation, and replacement are considered and mechanisms for porosity reduction, preservation, and enhancement are reviewed. The volume concludes with an overview of diagenesis and rock property modelling approaches that includes a case study involving a pre-drill reservoir quality prediction. Contents
Get Price WhatsApp11/11/2022The objective of the work is to explore the influence of tight sandstone physical characteristics, fracturing fluid composition, salinity, viscosity, surface tension on fracturing fluid imbibition, and further analyze its main controlling factors.
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02/10/2003The paper reports on a study of the weak sandstones of the Shihti and Kweichulin Formations to the east of Taipei, Taiwan. The results indicate that the wave velocity and uniaxial compressive strength (UCS) of the samples decreased as water content increased, while wave velocity, UCS and slake durability increased with
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