Loading LAS File – Downhole Geophysics Sample Data
Activity: Load LAS data 1.
Choose BoreholeDB > Load > Load LAS.
2.
In the LAS Filename Selections section, use the ellipsis button to locate the LAS file BNBY83_DEN.LAS.
3.
Under Scan Options, from the Data Type list, select GEOPHY. Notes: You select GEOPHY because you are loading downhole geophysics data. You would selectSURVEY when you want to load verticality data from a LAS file to modify the basic AZIMUTH and DIP data loaded as part of the Collar data.
4.
Click Scan LAS File Header . Minex scans the selected LAS file and populates the LAS Borehole and LAS Variables with data from the LAS file. If the BoreholeDB contains variables in the nominated Data Type those names are populated in the corresponding fields in the table.
5.
In the Import Options section, if the To Borehole field is blank, select BNBY83. Notes: If a matching Borehole does not exist, you would need t o define the name of the Borehole you want to load the data for - or load Collar data for the Borehole, rescan the input LAS file, and select the Borehole name if necessary.
6.
Select the Do not load any data above the Borehole collar and Do not load any data below final depth of Borehole check boxes.
7.
In the Borehole Definition section, select the BHDB Variables that match the LAS Variables, and select the Import Variable checkbox for each variable.
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Loading Sample Data into the Borehole Database
Loading LAS File – Downhole Geophysics Sample Data
8.
Click Ok.
9.
Click Yes to load the LAS data.
10.
The LAS Load Report is generated in the Output Window.
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Loading Sample Data into the Borehole Database
Loading LAS File – Downhole Geophysics Sample Data
Another way of loading downhole geophysical data is via an ASCII file or Access DB source.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
Creating a Single Hole Profile The next step in this tutorial is to create a Profile Plot of the ROCKTYPE data and geophysical data. Profile plots do not require section mounts to be created. The only requirement is a sheet size, scale, and which holes you want to plot. The Boreholes are plotted on the sheet next to each other rather than in the ‘real world’ position they’d be plotted to if you were plotting boreholes on a cross section. 1.
Choose BoreholeDB > Plot > Single Hole Profile. The B orehole Plotting [S ing le Hole Pr ofile] form opens.
2.
On the Function tab, click Select. The S elect B oreholes form opens.
3.
Select the borehole BNBY83, and click Ok. Minex returns to the B orehole Plotting [S ing le Hole Pr ofile] form.
4.
In the Seam Lithology Variable field, select ROCKTYPE.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
5.
Fill in the Trace Tab as shown.
6.
Click the Annotation & Lithology tab.
7.
Select the Sample Variable Annotation check box.
8.
Click Select Variables, and, from the S elect form, select ROCKTYPE.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
9.
Click the Histogram tab. You can use the Histogram Tab to setup to plot the trace of a Downhole Geophysics Variable beside those boreholes that have this data loaded. Tip: To find out which borehole has data loaded, generate a Report Sample Data report, and select the Data Existence option.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
10.
Fill in the Histogram tab as shown.
Note: The number in the Scale column controls the amplitude of the trace: If you have defined a data range when you created the Variable in the Database, Minex uses that range to calculate a Scale to plot a Histogram trace that is 1cm wide.
If you have not defined a data range for the Variable, Minex uses Scale = 100 and you may need to increase or decrease the Scale to get the Histogram trace you want.
11.
Click the Sheet Params tab.
12.
Select a Sheet Size of A2.
13.
Set the Orientation to Portrait.
14.
Click Calculate Scale. Minex calculates the scale that best fits the data on the sheet you have defined. If you want to make it a ‘round’ number, type in a number bigger than the one that the software has calculated. In this case, Minex has calculated a scale of 357. You could enter a scale of 400.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
15.
Click Ok.
The selected borehole is displayed in Graphics with:
Symbols identifying different ROCKTYPES.
Annotation of Quality Sample Data.
The Histogram trace of data from Downhole Geophysics variables GAMMA and DENLS.
Gemcom Minex 6.1.2
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
Gemcom Minex 6.1.2
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
Preparing a Borehole Section Plot To display boreholes with lithology codes and downhole geophysics on a Cross Section Mo unt, you must first have an existing section mount or create a new section mount. This Tutorial assumes that you have completed the Core Minex Tutorial and already know how to create a new Section Mount.
Activity: Load geophysics data To load geophysics data for boreholes: 1.
Select BoreholeDB > Load > Load Sample Data. The Load Sample Data form opens.
2.
In the File field, navigate to GEOPHYSICAL_LOGS.csv.
3.
Click Create/Edit. The C reate/E dit Format Fi le form opens.
4.
From Data Type list, select GEOPHY.
5.
If prompted, click Yes to change data types.
6.
Click the Variable setup tab, and complete the table as shown.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
7.
Click Ok. Minex will prompt you to save the format file under the default name GEOPHYSICAL_LOGS.sff .
8.
Click Save. Minex returns to the Load Sample Data form.
9.
Clear the Report missing intervals check box, and click Ok.
The Sample Load Report is generated in the Output Window. Note:
10.
Some records will be rejected.
Save the borehole database.
Activity: Create a new section mount 1.
Open ASHES.GM3.
2.
Choose Mounts > Section > Create. The S ection – C reate form opens.
3.
Create a section using boreholes as shown.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
4.
Click Ok, and save the section as sectn1.
5.
Save the geometry file.
Activity: Plot a borehole section 1.
On the Runtime tab of the Minex Explorer , expand the Mount Control Panel.
2.
Right click sectn1, and select Draft on Mount.
3.
Choose Mount > Section > Borehole Section. The S ection Plot form opens.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
Notes: This form is slightly different to the Borehole Profile Plot form: On the Function tab, you use the Minimum and Maximum offset fields to define a distance. Boreholes that fall inside that distance on either side of the trace of the section mount will be plotted on the Section mount. A minimum offset distance of 10 means that Boreholes whose collar location is 10m or feet either side of the section mount will be plotted. The maximum value deals with boreholes that have verticality data loaded to the SURVEY datatype. If a maximum of 10m is used, only that part of the borehole that falls within 10m of the trace of the section line will be plotted. If you want to see the entire trace of the borehole, you need to use a higher number.
The Sheet Params tab read-only. Because you are working on a section mount, the sheet size and orientation, and the scale are those of the section mount you have in memory.
4.
Fill in the Trace tab as shown to plot lithology fill in the borehole trace.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
5.
Fill in the Annotation & Lithology tab as shown to annotate rocktype names next to the borehole.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
6.
Fill in the Histogram tab as shown to plot a histogram trace of Gamma data next to each borehole.
7.
Click Ok. The boreholes are plotted in a 2D Graphics window.
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
Note:
This image has been rotated for increased visibility.
Gemcom Minex 6.1.2
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
8.
Choose Mount > Section > Coordinate Grid. The S ection – Coordinate Gri d form opens. You can use this form to plot a grid of eastings, northings, and elevations on the section mount
9.
Fill in the form as shown and click Ok.
10.
Click Ok. The coordinate grid is plotted with the boreholes in Graphics.
Gemcom Minex 6.1.2
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Loading Sample Data into the Borehole Database
Creating a Single Hole Profile
Note:
This image has been rotated for increased visibility.
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Loading Sample Data into the Borehole Database
