气候变化领域集成服务门户(CCPortal): Elastic Moduli of Arenites From Microtomographic Images: A Practical Digital Rock Physics Workflow

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DOI	10.1029/2020JB020422
	Elastic Moduli of Arenites From Microtomographic Images: A Practical Digital Rock Physics Workflow
	Liang J.; Gurevich B.; Lebedev M.; Vialle S.; Yurikov A.; Glubokovskikh S.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	Numerical computation from high-resolution 3-D microtomographic images of rocks (known as digital rock physics) has the potential to predict elastic properties more accurately. However, successful examples are limited to samples with simple structure and mineralogy. The physical size of sample is often too small to present heterogeneities at a larger scale and the image resolution is insufficient to characterize the details of rocks. Also, the grayscale values of different minerals in microtomographic images are often similar, and previous attempts to segment them as separate phases are not very successful. Here, we propose a practical digital rock physics workflow for somewhat more complex and ubiquitous rocks, namely, sandstones that contain mostly quartz and a small fraction of dispersed clay (known as arenites). Based on a set of images, we obtain a suite of postcomputation corrections to compensate for the effects of sample size and resolution of the microtomographic images. Furthermore, we build a segmentation workflow that effectively detects feldspar and clay minerals, despite their grayscale similarity to quartz. A moduli-porosity trend is derived from the subsamples of the original digital images. Bulk moduli agree well with the ultrasonic measurements on the dry samples at 40 MPa. Shear moduli remain overestimated, which is likely caused by poor knowledge of the mineral stiffness. We compensate for this effect using a heuristic correction to the matrix moduli. The final version of the workflow provides accurate elastic moduli trends with porosity and clay content based on only two samples of Bentheimer sandstone. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187538
作者单位	Centre for Exploration Geophysics, Curtin University, Perth, WA, Australia
推荐引用方式 GB/T 7714	Liang J.,Gurevich B.,Lebedev M.,et al. Elastic Moduli of Arenites From Microtomographic Images: A Practical Digital Rock Physics Workflow[J],2020,125(10).
APA	Liang J.,Gurevich B.,Lebedev M.,Vialle S.,Yurikov A.,&Glubokovskikh S..(2020).Elastic Moduli of Arenites From Microtomographic Images: A Practical Digital Rock Physics Workflow.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Liang J.,et al."Elastic Moduli of Arenites From Microtomographic Images: A Practical Digital Rock Physics Workflow".Journal of Geophysical Research: Solid Earth 125.10(2020).