Quantification of Fracture Roughness by Change Probabilities and Hurst Exponents

Mathematical Geosciences - Tập 54 - Trang 679-710 - 2021
Tim Gutjahr1, Sina Hale2, Karsten Keller1, Philipp Blum2, Steffen Winter3
1Institute of Mathematics, University of Luebeck, Luebeck, Germany
2Institute of Applied Geosciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
3Institute of Stochastics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Tóm tắt

The objective of the current study is to utilize an innovative method called “change probabilities” for describing fracture roughness. In order to detect and visualize anisotropy of rock joint surfaces, the roughness of one-dimensional profiles taken in different directions is quantified. The central quantifiers, change probabilities, are based on counting monotonic changes in discretizations of a profile. These probabilities, which usually vary with the scale, can be reinterpreted as scale-dependent Hurst exponents. For a large class of Gaussian stochastic processes, change probabilities are shown to be directly related to the classical Hurst exponent, which generalizes a relationship known for fractional Brownian motion. While related to this classical roughness measure, the proposed method is more generally applicable, therefore increasing the flexibility of modeling and investigating surface profiles. In particular, it allows a quick and efficient visualization and detection of roughness anisotropy and scale dependence of roughness.

Tài liệu tham khảo

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