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DICE:An open-source MATLAB application for quantification and parametrization of digital outcrop model-based fracture datasets

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1090-1110页

作者： niccolò menegoni Daniele Giordan Riccardo Inama Cesare Perotti Department of Earth and Environmental Sciences University of PaviaPavia27100Italy National Research Council of Italy Research Institute for Geo-Hydrological Protection(CNR-IRPI)Torino10135Italy Signal S.r.l. Via Fratelli Cuzio 42Pavia27100Italy

An open-source MATLAB application(app)named Discontinuity Intensity Calculator and Estimator(DICE)was developed in order to quantitatively characterize the fractures,or in more general,discontinuities within a rocky outcrop in three-dimensional(3D)digital data,such as digital outcrop model(DOM).The workflow proposed for the parametrization of the discontinuities consists of the following steps:(1)Analysis and mapping of the fractures detected within the 3D DOMs;(2)Calculation of the orientation,position and dimensions of discontinuities that are represented by best-fit circular planes;(3)Determining the discontinuity parameters(dimension,distribution,spacing and intensity)by the DICE algorithm using different 3D oriented sampling techniques(3D oriented scanline,3D oriented circular scan window and spherical scan volume).Different sampling methods were bench tested with a synthetic,as well as a natural case study,and compared in order to understand the advantages and limitations of each *** 3D oriented circular scan window appears to be the most effective method for fracture intensity estimation with high accuracy(error 0.4%)and stability with variations in scan radius.

关键词： Fracture parameter Discontinuity Fault Fracture intensity Linear fracture intensity(P10) Areal fracture intensity(P21) Volumetric fracture intensity(P32)

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Fracture network characterisation of the Balmuccia peridotite using drone-based photogrammetry,implications for active-seismic site survey for scientific drilling

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第10期16卷 3961-3981页

作者： niccolo menegoni Yuri Panara Andrew Greenwood Davide Mariani Alberto Zanetti Gyorgy Hetenyi Ali I.Al-Naimi Petroleum Engineering Research Center King Abdullah University of Science and TechnologyThuwal23955-6900Saudi Arabia Chair of Applied Geophysics Montanuniversit€at LeobenLeobenAustria Department of Earth and Environmental Sciences University of PaviaPaviaItaly Institute of Geosciences and Earth Resources National Research Council(IGG-CNR)PaviaItaly Institute of Earth Sciences University of Lausanne1015LausanneSwitzerland

The presence of discontinuities(***,fractures,veins,layering)in crystalline rocks can be challenging for seismic interpretations because the wide range of their size,orientation,and intensity,which controls the mechanical properties of the rock and elastic wave propagation,resulting in equally varying seismic responses at different *** geometrical characterisation of adjacent outcrop discontinuity networks allows a better understanding of the nature of the subsurface rocks and aids seismic *** this study,we characterise the discontinuity network of the Balmuccia peridotite(BP)in the IvreaeVerbano Zone(IVZ),northwestern *** geological body is the focus of the Drilling the Ivrea eVerbano zonE(DIVE),an international continental scientific drilling project,and two active seismic surveys,SEismic imaging of the Ivrea ZonE(SEIZE)and high-resolution SEIZE(Hi-SEIZE),which aim to resolve the subsurface structure of the DIVE drilling target through high-resolution seismic *** fracture characterisation,we developed two drone-based digital outcrop models(DOMs)at two different resolutions(10^(-3)-10 m and 10^(-1)-10^(3)m),which allowed us to quantitatively characterise the orientation,size,and intensity of the main rock *** properties affect the seismic velocity and consequently the interpretation of the seismic *** found that(i)the outcropping BP discontinuity network is represented by three more sets of fractures with respect to those reported in the literature;(ii)the discontinuity sizes follow a power-law distribution,indicating similarity across scales,and(iii)discontinuity intensity is not uniformly distributed along the *** results help to explain the seismic behaviour of the BP detected by the SEIZE survey,suggesting that the low P-wave velocities observed can be related to the discontinuity network,and provide the basic topological parameters(orientation,density,distribution,and aperture)of the frac

关键词： Remote sensing Fracture intensity Digital outcrop model(DOM) Rock discontinuity Fault SEismic imaging of the Ivrea ZonE(SEIZE) IvreaeVerbano Zone(IVZ) Crystalline rock

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