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Note: This module is deprecated and is no longer recommended for use in new processing flows.
GWellLogViewer is a visualization tool that reads well log data from a plain-text file and overlays the log curve on the seismic gather display. It projects each well log sample onto the nearest seismic trace, provided the well location falls within a user-defined lateral proximity radius. The resulting log curve is shown as a point overlay on the gather view, with its amplitude scaled by a user-defined factor to match the seismic display range.
The module is intended for quality control of seismic data against borehole measurements, allowing interpreters to visually compare seismic reflections with well log markers (for example, acoustic impedance or velocity curves) directly on the gather. The input well log file must be a whitespace-delimited text file with four columns per row: X coordinate, Y coordinate, two-way time (ms), and log value.
The seismic gather to display alongside the well log curve. Each trace in the gather must have valid bin coordinates (X, Y) assigned through a prior binning step. The module uses these coordinates to determine which trace is closest to each well log sample. If the gather contains no binned traces, the module will report an error and skip execution. Connect the output of the preceding processing step directly to this input.
A multiplicative scaling factor applied to all log values before they are plotted on the gather display. The default value is 100. Adjust this value so that the amplitude range of the displayed log curve is visually comparable to the seismic trace amplitudes in the gather. For example, if the log values are on the order of 0.01 and the seismic amplitudes are on the order of 1, set Scale to 100. Increasing the scale stretches the log curve laterally on the display; decreasing it compresses it.
The maximum lateral distance (in meters) between a well log sample location (X, Y) and the nearest seismic trace for that log sample to be included in the display. The default value is 100 m. Log samples whose nearest trace bin centre is farther than this distance are silently excluded from the overlay. Set this value to match your survey bin spacing or the expected lateral distance between the well and the seismic line. For a vertical well intersecting the line, a value of one to two bin widths is typically sufficient. For a deviated well running alongside but not through the seismic line, increase this value to capture the relevant depth range.
Full path to the well log input file. The file must be a plain-text (.txt) file with four whitespace-separated columns on each row: X (easting in meters), Y (northing in meters), Time (two-way time in milliseconds), and Value (the log measurement, for example acoustic impedance or interval velocity). Rows are read sequentially until the end of the file; blank lines or rows with fewer than four values terminate parsing. Verify that the coordinate system of the well log file matches that of the seismic survey to ensure correct spatial alignment.