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Take the output of the fracture detection model, “simple” classes only
Run a segmentation model to extract predicting the fracture profile (or skeleton)Fit polyline to left, middle and right of skeletonitself, then post process into a binary mask/overlay. The edges of this overlay are known as skeletons.
Fit an ellipse to each of the polylines left and right skeletons
Check for core neatness: plot each ellipse on stereonet, if tight fit, proceed to the next step. If not, discard this joint for measurement.
Check for neatness of fit of the ellipse to the skeleton. If outside of threshold, do not proceed.
Straighten out profile of ellipse, fracture profile interface
Calculate the JRC_median, JRC_lower_bound, JRC_upper_bound for each. This provides a score from 0-20.
Calculate average value across each interval.
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Product Configuration Options
There are no configuration aspects to this product.
Output
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Default interval length: 3.0m
Customisable interval available: No
Data
Fracture point data
User Data
Not currently able to upload to the platform.
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File Header | Description | |
hole_id | Customer’s Hole ID | |
depth | Depth of fracture | |
depth_fromStart of interval | From depth for the fracture detection bounding box | |
depth_to | End of interval | |
jrc_median | Median JRC. This is the suggested JRC | |
jrc_lb_median | Lower Bound JRC, the To depth for the fracture detection bounding box | |
shape_status | Success/failure of ellipse fitting. Includes reason if failed. | |
jrc_status | Success/failure of JRC measurement. Includes reason if failed. | |
jrc_left_s | Left side of fracture: suggested (median) JRC measurement | |
jrc_left_u | Left side of fracture: upper bound JRC measurement. The statistical upper bound of the potential range of JRC values based on this method. | |
jrc_left_l | Left side of fracture: lower bound JRC measurement. The statistical lower bound of the potential range of JRC values based on this method. | |
jrc_ub_medianUpper Bound JRC, the statistical upper right_s | Right side of fracture: suggested (median) JRC measurement | |
jrc_right_u | Right side of fracture: upper bound JRC measurement. The statistical upper bound of the potential range of JRC values based on this method. | |
jrc_right_l | Right side of fracture: lower bound JRC measurement. The statistical lower bound of the potential range of JRC values based on this method. | |
timestamp | Time of model prediction | |
version | A model version identifierjrc_left_error | Fit score of the ellipse fitting to the left skeleton. |
jrc_right_error | Fit score of the ellipse fitting to the right skeleton. | |
selected_side | The selected side of the fracture for reporting final JRC measurements. | |
JRC | The suggested JRC measurement of the selected side of the fracture. |
Product Limitations
Limitations | Comments |
Measurement on “simple” fractures only | This method is limited to fractures that have one interface only, as we need a clear interface to measure. There may be intervals of broken rock that have different JRC values |
Analysing interface of fracture with edge of core | The nature of this method relies on a direct correlation between a fracture’s internal roughness and the appearance of its interface with the circumference of the core. A comparison with logged data across the customer’s range of lithology is required. |
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