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To import a geophysical file into a borehole log either:
After one of the above tasks is completed, the Import Geophysical Log form will be displayed. Select the name of the file to import and then press the Open button.
Once the file name has been specified the format of the geophysical log needs to be selected from the Geophysical File Type form. Several types of file formats are shown, if the format of your log is not shown try to use the Generic ASCII format; otherwise, contact GAEA to see if support for that format can be added. Select the format of the geophysical log file and then press the OK button.
Depending upon the format of the geophysical file, you will then be prompted to select which curve (gamma ray, resistivity, SP, etc.) in the file to display. Some geophysical file formats support multiple curves in one file. If the file format is LAS the Geophysical Log Type form will be displayed. Select the curve to display from the list of available curves in that file.
If the file format is Generic ASCII the Generic File Format form will be displayed. The following information can be entered on this form:
Column Format: The file can have either the depths in readings in columns or only the readings in a column. If the column format is “Depths and Readings” the depths of the data points will be extracted from the depth column. If the column format is “Readings Only” the depths of the data points will be calculated using the specified start depth and increment.
Number of Header Lines: This is the number of header lines in the file to skip before reading the data from the columns.
Number of Columns: This is the number of data columns in the file.
Reading Column: This is the number of the column (starting with column 1 at the left side of the file) that has the readings.
Depth Column: This is the number of the column that has the depths. If the Column Format is “Readings Only”, this field will not be displayed.
Start Depth: This is the start depth to use for the readings. If the Column Format is “Depths & Readings”, this field will not be displayed.
Depth Interval: This is the depth interval to use between readings. If the Column Format is “Depths & Readings”, this field will not be displayed.
In order to save time and memory when displaying geophysical data, the data can be resampled at the time it is imported into the borehole log. After the log type is selected, the Resample Data form will be displayed. The following parameters can be entered on this form:
Start Depth: The depth to start importing data, all samples from depths before the Start Depth will be ignored. If Resample Data is set to No this field will not be displayed.
End Depth: The depth to stop importing data, all samples from depths after the End Depth will be ignored. If Resample Data is set to No this field will not be displayed.
Depth Increment: The increment to use between depths when importing, any samples at depths between increments will be ignored. For example, if the Depth Increment is 1 and the file contains samples at depths 1.1, 1.6, and 2.1. The sample at depth 1.6 will be ignored. If Resample Data is set to No this field will not be displayed.
Add Offset: This is an offset depth to be added to the depths in the file. This is used to adjust for instrument height if necessary. If Resample Data is set to No this field will not be displayed.
After the above information has been entered, the geophysical file will be imported. When the file has been successfully imported, the number of samples read will be displayed.