Surface morphology characteristics of rock discontinuities with particular reference to their genesis

Aydan, Ömer; Shimizu, Yasuhiro

doi:10.1144/gsl.sp.1995.092.01.02

Cited by 7 publications

(1 citation statement)

References 4 publications

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“…The most prominent techniques for quantitative fractography in metallurgy can be classified into three categories: stereoscopic methods (such as stereoscopic imaging and measurements and photogrammetric methods), projected images, and profile generation (Underwood, 1986). The first and third methods are predominantly applied when quantifying the fracture surface roughness of rocks (e.g., Aydan & Shimizu, 1995; Jessell et al, 1995; Nigon et al, 2017). A variety of roughness characterization parameters have been proposed, and the most commonly used parameters associated with linear profiles or surfaces are the root mean square roughness and the fractal dimension at multiple scales (e.g., Bobko & Ulm, 2008; Kassis & Sondergeld, 2010; Thomas, 1981).…”

Section: Resultsmentioning

confidence: 99%

Investigating the Meso‐Mechanical Anisotropy and Fracture Surface Roughness of Continental Shale

Huang

Tan

et al. 2020

JGR Solid Earth

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Continental shale is abundant with unconventional oil and gas and has considerable prospect for exploitation. However, due to deposited environment differences, continental shale presents unique characteristics in terms of structure and mineralogy compared to marine shale. The mechanical property is elemental parameter for reservoir production, but relevant studies of continental shale are rarely reported. In this study, several groups of mesoscale (0.1–10 mm) uniaxial compression tests were conducted on continental shale with various bedding angles, sourced from the Yanchang Formation in the southern Ordos Basin, China. A new integrated real‐time loading‐observation‐acquisition system, specifically, a miniature tensile instrument‐light microscope (MTI‐LM) system, was utilized, which allowed us to visualize the failure process and simultaneously record the stress‐strain curves, providing snapshots for investigation of fracture initiation, propagation, and fracture surface features. The results demonstrate that as the bedding angle relative to the maximum compression direction increases, the uniaxial compressive strength (σc) and the percentage of bedding‐parallel fractures (Fp) fluctuate reversely, namely, higher σc corresponds to lower Fp. Additionally, a good consistency is revealed among the variations of σc, failure time and fracture surface roughness with bedding angles, suggesting stronger shale having rougher fracture surfaces and longer failure time at a certain loading rate. The meso‐mechanical anisotropy of shales is supposed to have an origin in heterogeneous component and microtexture, as indicated by different bridges connecting the opposite facies of fractures. The findings help reveal the mechanism underlying mechanical anisotropy and facilitate fracability evaluation of shallow shale gas reservoir.

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