自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 3    March 2017

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Effects of porosity heterogeneity on chemical dissolution-front instability in fluid-saturated rocks
ZHAO Chong-bin(赵崇斌)1, Peter SCHAUBS2, Bruce HOBBS3

1. Computational Geosciences Research Centre, Central South University, Changsha 410083, China;
2. CSIRO Mineral Resource National Research Flagship, P. O. Box 1130, Bentley, WA 6102, Australia;
3. School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia

Abstract:Homogeneity and heterogeneity are two totally different concepts in nature. At the particle length scale, rocks exhibit strong heterogeneity in their constituents and porosities. When the heterogeneity of porosity obeys the random uniform distribution, both the mean value and the variance of porosities in the heterogeneous porosity field can be used to reflect the overall heterogeneous characteristics of the porosity field. The main purpose of this work is to investigate the effects of porosity heterogeneity on chemical dissolution front instability in fluid-saturated rocks by the computational simulation method. The related computational simulation results have demonstrated that: 1) since the propagation speed of a chemical dissolution front is inversely proportional to the difference between the final porosity and the mean value of porosities in the initial porosity field, an increase in the extent of the porosity heterogeneity can cause an increase in the mean value of porosities in the initial porosity field and an increase in the propagation speed of the chemical dissolution front. 2) An increase in the variance of porosities in the initial porosity field can cause an increase in the instability probability of the chemical dissolution front in the fluid-saturated rock. 3) The greater the mean value of porosities in the initial porosity field, the quicker the irregular morphology of the chemical dissolution front changes in the supercritical chemical dissolution systems. This means that the irregular morphology of a chemical dissolution front grows quicker in a porosity field of heterogeneity than it does in that of homogeneity when the chemical dissolution system is at a supercritical stage.

 

Key words: porosity heterogeneity; chemical dissolution; front instability; computational simulation; porous rocks

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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