NAVIGATION MENU
File: Click on "Browse", select you input LAS file, and click on "Open". After that you will see LAS summary, and a list of logs found in this file. You can select which logs to display, and change vertical scale by changing window size.
Logs: Use "Logs" menu to display logs available in LAS file. You can save pictures of zoomed curves from the left upper corner of log panels by selecting a camera sign. It will be saved as a png file.
Derived logs / Velocity: Use this menu item to display interval and RMS veloscity, and any derived logs.
If sonic log with transition time DT is available, this tool can calculate two derived logs:
interval and RMS velocity that can be used for depth migration and checking velocity trend for seismic data processing.
Cross-plots: To select logs for cross-plots display. The first selected log will be on horizontal axis, the second log and all other will be on vertical axis.
Cross-plots2: Use this to display a cross-plot with two source logs, select depth interval for cross-plot, calculate linear regression, Gardner and Gardner-like functions.
Use "Update" button to display or update crossplots with different depth interval.
Synthetic seismic: Use this menu to create a synthetic trace from sonic log. You can change frequency of Ricker wavelet.
You can also see how it works using Model radio button.
Use "Update plot" to plot convloved trace with another frequency.
Model: Use this menu to create a synthetic trace from your model defined in CSV file.
There are two formats: time (s), reflectivity, and depth(m), vel (m/s), density(g/cm3).
Here are two examples of input CSV files:
File1
time (s),reflectivity
1.2,0.5
2.,-0.8
File2
depth (m), vel (m/s), density (g/cm3)
400,3600,2.3
1500,6700,2.75
1750,4500,2.2
2250,6000,2.6
Use "Update plot" to plot synthetic traces trace on new data.
FORMATION TOPS PLOT
Plot tops from LAS: If your LAS file has Tops Data Section(s), you can plot tops on log display.
You can turn on and off top lines, and fill zones between tops with color.
Plot tops from CSV file: Alternatively, you can input tops data from CSV file.
Here is an example of CSV file:
TOP NAME, UNIT, DEPTH, R, G, B
FORMATION 1 TOP, .M, 451.0000, 128,197,221
FORMATION 2 TOP, .M, 531.0000, 189,140,195
FORMATION 3 TOP, .M, 579.0000, 152, 57, 153
The last three columns are not necessary. You can use them to color intervals between tops.
You can get the RGB Standard Color Codes for the Geological Time Scale from:
timescalefoundation.org/charts/rgb.html
to fill R, G, B columns. Use "Read tops from" menu to select source for tops data.
Report an issue, ask a question or send feedback on LAS Viewer to alex@oilterms.com
