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This document details Datarock’s product Dominant Colour.

Contents

Literature

This product is based on the following literature:

Title

Author

Year

Dependent Models

The imagery only needs to have passed through Depth Registration in order to process Dominant Colour.

Data Processing

The following steps are taken to determine the Dominant Colour of a row image.

  1. Take the output of the fracture detection model, “simple” classes only

  2. Run a segmentation model to extract the fracture profile (or skeleton)

  3. Determine its angle and curvature

  4. For a given 3m interval, plot each measurement of angle and curvature on the plot shown below

  5. Create 45° bins for fracture angles, slide left/right to minimise number of bins

  6. If there are three or more fractures in a bin, a set is assigned. Other fractures are designated random.

  7. Combine the measured values of each fracture with “complex” fracture detections as per the flowchart below.

Number of Sets

Random Joints Present?

Description

Jn

0

No

No joints

0.5

0

Yes

Random joints

1.0

1

No

One set

2.0

1

Yes

One set + random

3.0

2

No

Two sets

4.0

2

Yes

Two sets + random

6.0

3

No

Three sets

9.0

3

Yes

Three sets + random

12.0

4

No

>4 sets - heavily jointed

15.0

5

No

Crushed rock

20.0

Product Configuration Options

Configuration

Options

t_1 threshold (see flowchart above)

Threshold can be set to any value.

Default value is 30%

t_2 threshold (see flowchart above)

Threshold can be set to any value.

Default value is 20%

t_3 threshold (see flowchart above)

Threshold can be set to any value.

Default value is 10%

t_4 threshold (see flowchart above)

Threshold can be set to any value.

Default value is 0%

Output Intervals

Default interval length: 3.0m

Customisable interval available: No

User Data

User data may be uploaded to the platform via csv in the following format:

·       HoleID_sampling_intervals_joint_sets.csv

CSV file to contain the following headers:

File Header

Description

depth_from

Start of interval

depth_to

End of interval

jn

Joint Set Number logged on site. This is an optional field.

Data Output

Results from this product is delivered in a batch nature.

Integration of the required technologies into Datarock production is ongoing.

The available CSV files include the following:

  • ProjectID_Joint_Set_Analysis_3m.csv

File Header

Description

hole_id

Customer’s Hole ID

depth_from

Start of interval

depth_to

End of interval

jn

Joint Set Number as defined in the Q-System

jn_description

Joint Set Number description as defined in the Q-System

timestamp

Time of joint set calculations

version

A model version identifier

Product Limitations

Limitations

Comments

Measurements are taken on simple, single interface fractures only.

This method is based on measurements of simple, single interface fractures, and assumed parameters for broken zones. It is recommended that these assumptions be verified based on customer’s logging schema.

Document Version

Version

Date

Author

Rationale

1

6 Sep 2022

S Johnson

Initial release

2

9 Mar 2023

S Johnson

Updated with Jn table

3

18 July 2023

S Johnson

Updated for custom intervals

 

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