Effect of grain sorting, mineralogy and cementation attributes on the localized deformation in porous rocks: A numerical study

Xiong, Liangfeng; Wu, Shunchuan; Wu, Tianhua

doi:10.1016/j.tecto.2021.229041

Cited by 4 publications

(5 citation statements)

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“…Xiong et al. (2021) reported that a high ratio between the number of macropores and micropores promotes compaction localization. Abdallah et al.…”

Section: Discussionmentioning

confidence: 99%

“…Such an observation might be due to the pore space morphology, where local heterogeneities in the pore space, reduced as the width of the grain size distribution increases, act as stress concentrators and promote the growth of compaction bands. Xiong et al (2021) reported that a high ratio between the number of macropores and micropores promotes compaction localization. Abdallah et al (2021) also found, using digital image correlation on deformed Saint Maximin limestone samples, that porosity heterogeneities control the initiation and propagation of compaction bands, which tend to grow in the high-porosity areas of the samples.…”

Section: Compaction Localizationmentioning

confidence: 99%

“…For example, Wang et al (2008) reproduced the broad phenomenology of the brittle-ductile transition using discrete element method (DEM) simulations and showed that a grain size distribution with a low polydispersivity promotes compaction localization in granular materials. However, studying the control of polydispersivity of the mechanical behavior of porous rocks in the laboratory is challenging because changes in polydispersivity are typically accompanied by variations in other microstructural parameters such as the porosity, and are intimately interlinked with attributes such as the mean pore diameter (Torquato, 2002), which also influences mechanical behavior (Xiong et al, 2021;Zhu et al, 2010). Moreover, DEM simulations are often limited to 2D and direct comparisons with experimental data are therefore fraught.…”

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confidence: 99%

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The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks

et al. 2022

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The modes of formation of clastic rocks result in a wide variety of microstructures, from poorly‐sorted heterogeneous rocks to well‐sorted and nominally homogeneous rocks. The mechanical behavior and failure mode of clastic rocks is known to vary with microstructural attributes such as porosity and grain size. However, the influence of the grain size distribution, in particular the degree of polydispersivity or modality of the distribution, is not yet fully understood, because it is difficult to study experimentally using natural rocks. To better understand the influence of grain size distribution on the mechanical behavior of porous rocks, we prepared suites of synthetic samples consisting of sintered glass beads with polydisperse grain size distributions. We performed hydrostatic compression experiments and found that, all else being equal, the onset of grain crushing occurs much more progressively and at lower pressure in polydisperse synthetic samples than in monodisperse samples. We conducted triaxial experiments in the regime of shear‐enhanced compaction and found that the stress required to reach inelastic compaction was lower in polydisperse samples compared to monodisperse samples. Further, our microstructural observations show that compaction bands developed in monomodal polydisperse samples while delocalized cataclasis developed in bimodal polydisperse samples, where small grains were systematically crushed while largest grains remained intact. In detail, as the polydispersivity increases, microstructural deformation features appear to transition from localized to delocalized through a hybrid stage where a compaction front with diffuse bands propagates from both ends of the sample toward its center with increasing bulk strain.

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“…Xiong et al. (2021) reported that a high ratio between the number of macropores and micropores promotes compaction localization. Abdallah et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Compaction Localizationmentioning

confidence: 99%

mentioning

confidence: 99%

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The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks

et al. 2022

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“…In addition to shale mineral composition, shale mineral grain size and its distribution influence the propagation behavior of hydraulic fractures. Shale mineral grain size and its distribution have an important influence on fracture propagation and energy release, with the relative abundance of rougher mineral grains favoring compaction locally when the largest mineral grain size does not exceed five times the smallest mineral grain size, accompanied by both less fragmentation and energy release (Xiong et al 2021). For different mineral compositions, the particle size and distribution determine the degree of the denseness of the shale.…”

Section: Influence Of Mineral Compositionmentioning

confidence: 99%

“…In addition, scholars have investigated the effect of the widely distributed bedding structure in shale on hydraulic fracture propagation, pointing out that the bedding structure is the key to the generation of a complex network of seams by hydraulic fractures (Tan et al 2018;Suo et al 2020). Besides discontinuities, researchers have also investigated the effects of shale mineral composition and connections between mineral grains on hydraulic fracture propagation behaviors, pointing out that mineral composition indirectly affects hydraulic fracture propagation paths by influencing shale characteristics such as inhomogeneity, anisotropy, mechanical properties, and pore structure (Bakhshi et al 2020;Chen 2022a;Li et al 2020;Miao et al 2021Miao et al , 2023Sun et al 2021;Xiong et al 2021;Zeng et al 2019;Liang et al 2019). Then, scholars also analyzed the stress state of the subsurface shale and found that the length of hydraulic main cracks becomes larger with the increase of the main stress difference (Blanton 1982(Blanton , 1986Renshaw and Pollard 1995;Gu and Weng 2010;Gu et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Analysis of geological factors affecting propagation behavior of fracture during hydraulic fracturing shale formation

Gong,

Ma,

Liu

2024

Geomech. Geophys. Geo-energ. Geo-resour.

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The complexity of hydraulic fracture network generation during the fracturing of shale reservoirs is a key indicator of the effectiveness of fracture stimulation. To obtain as large a reservoir stimulation volume as possible, this paper reviews articles on the study of hydraulic fracture propagation mechanism during hydraulic fracturing, analyses the factors affecting hydraulic fracture propagation, and classifies them into two categories: geological factors and engineering factors. In particular, the geological factors affecting hydraulic fracture propagation are classified into five categories: mineral composition of the shale, connections between mineral grains, defects in the shale, geostress, and temperature. Various influencing factors act together, resulting in the hydraulic fracture propagation path is difficult to predict. Therefore, this paper firstly explores the hydraulic fracture propagation pattern under the action of single geological factors and specifies its action mechanism; secondly, it also analyses the hydraulic fracture propagation pattern under the combined action of multiple geological factors and analyses its action mechanism. It is clear that relatively high brittle mineral content and temperature, low stress anisotropy and cementation strength, and a more developed natural fracture network are conducive to the generation of a complex fracture network. By analyzing the influence mechanism of single factors and multiple factors, the influence mechanism of geological factors on hydraulic fracture propagation is identified, guiding the optimal design of hydraulic fracturing.

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Quantifying occurrence of deformation bands in sandstone as a function of structural and petrophysical factors and their impact on reservoir quality: an example from outcrop analog of Productive Series (Pliocene), South Caspian Basin

Alkhasli

Zeynalov

Shahtakhtinskiy

2022

J Petrol Explor Prod Technol

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Deformation bands (DB) are known to influence porosity and permeability in sandstones. This study aims to predict the occurrence of DB and to quantify their impact on reservoir properties based on field measurements in the steeply dipping limb of a kilometer-scale fold in Yasamal Valley, western South Caspian Basin. An integrated approach of characterizing bands and their effect on reservoir properties included measurements of natural gamma radioactivity and permeability using portable tools, along with bed dip and the count of DB across distinct facies. A set of core analyses was performed on outcrop plugs with and without bands to estimate the alteration of rock properties at the pore scale. Interpretation of outcrop gamma-ray data indicates the absence of bands in Balakhany sandstones containing shale volume greater than 18% for unconsolidated and 32% for calcite-rich facies. A high amount of calcite cement appears to increase the number of DB. A poor, positive trend between bed dip and DB concentration was identified. We show that net to gross, defined as the thickness fraction of sandstone bound by mudstones, is among the parameters controlling the occurrence of bands. Samples containing a single DB show a 33% and 3% decrease in permeability and porosity, respectively, relative to the host rock. We reveal a new set of lithological and petrophysical factors influencing DB occurrence. This study offers a direct tool that can be applied in subsurface reservoir analogs to predict the occurrence and concentration of DB and estimate their influence on rock properties.

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Effect of grain sorting, mineralogy and cementation attributes on the localized deformation in porous rocks: A numerical study

Cited by 4 publications

References 85 publications

The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks

The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks

Analysis of geological factors affecting propagation behavior of fracture during hydraulic fracturing shale formation

Quantifying occurrence of deformation bands in sandstone as a function of structural and petrophysical factors and their impact on reservoir quality: an example from outcrop analog of Productive Series (Pliocene), South Caspian Basin

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