The impact of rock composition on geomechanical properties of a shale formation: Middle and Upper Devonian Horn River Group shale, Northeast British Columbia, Canada

Dong, Tian; Harris, Nicholas B.; Ayrancı, Korhan; Yang, Sheng

doi:10.1306/07251615199

Cited by 81 publications

(49 citation statements)

References 33 publications

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“…The impact of evolution of microaggregate compocomposition on the degradation of subsidence, in the process of moisture increase in the aeration zone, has been insufficiently studied. Searching for connections between the structure of sediments and their geomechanical properties is relevant in different areas of application in geology (Dong et al, 2017). Mokritskaya and Koriashkina (Mokritskaya, Koriashkina, 2013) describe variants of predicting relative subsidence.…”

Section: ключевыеmentioning

confidence: 99%

О Некоторых Аспектах Моделирования Геодинамического Риска На Территориях Рас-Пространения Просадочных Грунтов.

Mokritskaya

Samoylych

2017

Вісн. Дніпр. унів.: геол, географ.

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In modeling geodynamic risk, the issues of developing special models of risk on the territories of distribution of loess and loess-like subsubsident soils under technogenic impact are of great relevance. Developing such models is a multi-stage process, which requires developing a model of the geological structure of a studied massif and setting predicted values of the properties of loess soils for preliminary quantitative evaluation of possible deformations in the natural conditions and in the zone of impact of constructions. Standard quantitative evaluaevaluation concerning the subsidence is carried out using results of testing the sample in limit states. Prognosis of the degradation of subsidence properties as a result of the break-up of the microaggregates in the zone of aeration is possible in conditions of impact of changes in the microaggregate compound on the subsidence. Using the method of defining the granulometric composition of the soil allows one to determine the area of soil condition in relation to dispersity. The method of GMDH allows one to develop a mathematmathematical model of degradation of subsidence properties and calculate the predicted values of deformation in the zone of insufficient water content. The degradation of the subsidence properties of subaerial horizons is manifested most significantly at mild (30% of possible) increments of moisture and pressure of 0.1 mPa. In the area of additional pressure, predicted values of deformation insignificantly increase under moisture due to degradation, with increased moisture the break-up of the aggregates of sand fraction is followed by increase in the number of aggregates of smaller size (large-grained pulverescent ∆А 3 ). The content of free thin finegrained sandy (∆M 2 ), and clayey particles (∆М 5 , ∆М 6 ) increases, connected with aggregates of thin fine-sandy and large-grained clayey. The share of aggregates of large-grained pulverescent fraction also increases; the content of particles of this fraction assembled in the aggregates decreases. The dependency of deformation intensity in conditions of degradation of paleosol is of another character: the intensity of degradation increases as the pressure rises. The analysis of predicted values of aggregate content, free and assembled particles when there is change in moisture conditions showed that the process of the break-up of thin fine-sandy aggregates and increase in the share of large-grained clayey aggregates (composed of thin fine-sandy particles) is followed by occurrence of free particles of thin fine-sandy and thin clayey fractions.

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Section: ключевыеmentioning

confidence: 99%

О Некоторых Аспектах Моделирования Геодинамического Риска На Территориях Рас-Пространения Просадочных Грунтов.

Mokritskaya

Samoylych

2017

Вісн. Дніпр. унів.: геол, географ.

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“…Multiple uncertain parameters in actual fracturing increase the difficulty of fracturing design; thus, researches on factors affecting fracturing are studied. Fracturing crack morphology is affected by parameters, such as the geo-mechanical and mechanical properties and the stress distribution of target formation [24,25], and the most crucial parameters affecting fracture design include Young's modulus, pumping rate, and the in-situ stress contrast [26]. In the case of the same in-situ stress difference, the larger the stress value is, the larger the crack width, and the shorter the crack length will be, thus affecting the degree of stress interference [27].…”

Section: Introductionmentioning

confidence: 99%

Uncertainty Analysis of Factors Influencing Stimulated Fracture Volume in Layered Formation

et al. 2019

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Hydraulic fracture dimension is one of the key parameters affecting stimulated porous media. In actual fracturing, plentiful uncertain parameters increase the difficulty of fracture dimension prediction, resulting in the difficulty in the monitoring of reservoir productivity. In this paper, we established a three-dimensional model to analyze the key factors on the stimulated reservoir volume (SRV), with the response surface method (RSM). Considering the rock properties and fracturing parameters, we established a multivariate quadratic prediction equation. Simulation results show that the interactions of injection rate (Q), Young’s modulus (E) and permeability coefficient (K), and Poisson’s ratio (μ) play a relatively significant role on SRV. The reservoir with a high Young’s modulus typically generates high pressure, leading to longer fractures and larger SRV. SRV reaches the maximum value when E1 and E2 are high. SRV is negatively correlated with K1. Moreover, maintaining a high injection rate in this layered formation with high E1 and E2, relatively low K1, and μ1 at about 0.25 would be beneficial to form a larger SRV. These results offer new perceptions on the optimization of SRV, helping to improve the productivity in hydraulic fracturing.

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“…Hucka and Das, 1974;Grieser and Bray, 2007;Jarvie et al, 2007;Rickman et al, 2008;Wang and Gale, 2009;Altindag, 2010;Herwanger et al, 2015;Lai et al, 2015;Zhang et al, 2016), 각 방법에서 취성도 계산에 영향을 미치는 요소들을 규명하고, 서로 다른 취성도 계산 방법 사이의 상호연관성을 확인하려는 연구들이 수행되어 왔다(e.g. Guo et al, 2013;Park et al, 2014;Hu et al, 2015;Dong et al, 2017). 이 중, 탄성계수인 영률과 포아송비 를 이용하는 탄성계수 기반의 취성도와 암석을 구성하는 광물의 조 성, 함량 및 유기물 함량을 이용하여 계산하는 광물학 기반의 취성도 가 대표적인 방법으로 사용되고 있다 (Table 1)(e.g.…”

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The effect of mineral composition and rock fabric on brittleness index: an example using the Montney Formation, Canada

Son¹,

Lee²,

Kwon³

2018

J Pet Sediment Geol

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This study deals with brittleness index, which is a conceptual property that affects fracture behavior in rocks. Generally, more fracture networks are developed in more brittle rocks. For this reason, brittleness has been used as a guide to decide the target formation of hydraulic fracturing stimulation for shale and tight gas productions. Previous studies have been conducted to find out which factors have influences on the estimations of various brittleness indices to represent rock brittleness quantitatively. The objective of this study is to investigate the effect of rock fabric on the estimation of the mineralogy-based brittleness index. Both elastic moduli-and mineralogy-based brittleness indices, which are the most commonly used indices, are obtained using available data from the Montney Formation, Canada. The former index is evaluated using the Young's modulus and the Poisson's ratio that are calculated from the sonic and density logs. The latter index is estimated based on the mineral composition from X-ray diffraction quantitative analysis. Comparison between the results from two different methods indicates that quartz might be the controlling mineral on the brittleness index of the lower Montney Formation. Thin section observations, however, show that the strength of the lower Montney Formation might be determined by dolomite and clay considering matrix-supported textures. This means that rock strength and brittleness may not be governed by same controlling factors. This suggests that rock fabrics, such as anisotropy due to the lamination or quantitative analysis of minerals which constitute grain, cement, and matrix through thin section observation, should be considered in addition to the mineral composition in order to evaluate mineralogy-based brittleness index more accurately.

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The impact of rock composition on geomechanical properties of a shale formation: Middle and Upper Devonian Horn River Group shale, Northeast British Columbia, Canada

Cited by 81 publications

References 33 publications

О Некоторых Аспектах Моделирования Геодинамического Риска На Территориях Рас-Пространения Просадочных Грунтов.

О Некоторых Аспектах Моделирования Геодинамического Риска На Территориях Рас-Пространения Просадочных Грунтов.

Uncertainty Analysis of Factors Influencing Stimulated Fracture Volume in Layered Formation

The effect of mineral composition and rock fabric on brittleness index: an example using the Montney Formation, Canada

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