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DOI	10.1029/2019JB018759
	Stress Sensitivity of Fractured and Vuggy Carbonate: An X-Ray Computed Tomography Analysis
	Yang Y.; Tao L.; Yang H.; Iglauer S.; Wang X.; Askari R.; Yao J.; Zhang K.; Zhang L.; Sun H.
发表日期	2020
ISSN	21699313
卷号	125 期号:3
英文摘要	Fractures, vugs, and pores constitute the main pore space in carbonate reservoirs. The associated pore structure—which is of key importance in terms of hydrocarbon production and fluid flow—varies with effective stress. However, there is a serious lack of data with regard to how precisely the pore morphology changes as a function of effective stress; we thus carried out in situ loading-unloading experiments (up to 20 MPa effective stress) where two carbonate samples (fractured and vuggy) were examined with X-ray computed tomography at high resolution in 3-D. The results showed that after loading, porosity decreased exponentially, followed by an increase during unloading where it did not recover to its initial value. This was mainly because of the stress effect on large pore space (i.e., fractures and vugs). For fractured carbonate, the unrecovered porosity can be linked to similar reduction of the surface area and the average aperture of the fracture. Clearly, the changes in pore morphology were more significant in the fractured carbonate (including extension, connection, and disconnection of fractures) during both loading and unloading, while the vuggy carbonate experienced irreversible structural damage. The vuggy carbonate has bigger porosity variation than fractured carbonate to the mechanical loading-unloading cycle. This work thus demonstrates how carbonate pore morphology changes with depth (higher effective stresses are encountered deeper in the reservoir) or during production (with hydrocarbon depletion the effective stress increases). ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	carbonate; fracture; porosity; stress sensitivity; vug; X-ray computed tomography
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/187902
作者单位	Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum [East China]), Ministry of Education, Qingdao, China; Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China; School of Engineering, Edith Cowan University, Joondalup, WA, Australia; Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, MI, United States
推荐引用方式 GB/T 7714	Yang Y.,Tao L.,Yang H.,et al. Stress Sensitivity of Fractured and Vuggy Carbonate: An X-Ray Computed Tomography Analysis[J],2020,125(3).
APA	Yang Y..,Tao L..,Yang H..,Iglauer S..,Wang X..,...&Sun H..(2020).Stress Sensitivity of Fractured and Vuggy Carbonate: An X-Ray Computed Tomography Analysis.Journal of Geophysical Research: Solid Earth,125(3).
MLA	Yang Y.,et al."Stress Sensitivity of Fractured and Vuggy Carbonate: An X-Ray Computed Tomography Analysis".Journal of Geophysical Research: Solid Earth 125.3(2020).