The 3-D Imaging of Drill Core for Fracture Mapping

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Creator: 

Olson, Laura Christina

Date: 

2013

Abstract: 

The Rock Quality Designation (RQD) is a widely used indicator of rock mass strength. This proof of concept research is a step toward the semi-automatic computation of the RQD and is based on 3-D imaging procedures and algorithms to detect fractures in drill core.The images were acquired with a 3-D laser digitizer. Each image file is a point cloud of spatially referenced measurements in Cartesian space. Variations in the z coordinate were used to detect fractures in profile. Natural fractures were distinguished from mechanical breaks by measuring the angle and quantifying the roughness of the fracture trace. The algorithm measured intact lengths of core for the RQD calculation. Established image processing tools were tested on 3-D data. 3-D core models were made.This 3-D approach measures changes in the core surface, not highlights and shadows as with 2-D methods. Limitations arise when there is no detectable change in z.

Subject: 

EARTH SCIENCES Geology
EARTH SCIENCES Geophysics
EARTH SCIENCES Remote Sensing

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Science: 
M.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Earth Sciences

Parent Collection: 

Theses and Dissertations

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