Welcome to Online Petrophysics Plotter 👋

This is a documentation of online website to plot LAS file data into a triple combo plot and formation evaluation plot.

The website is available at plotpetrophysics

Features:

• Adjustable depth, color, and curve-shading.
• Shading for shales, carbonate, and sandstone are using geological symbol
• A built in example from pre-loaded LAS file.
• Ability to calculate Rw from Salinity and Temperature.
• Ability to calculate VSH from Gamma-Ray or Density-Neutron logs.
• Ability to calculate porosity (total or effective) from Density only or Density-Neutron combination (Crossplot).
• Coal Flag with Neutron and Density Cutoffs.
• Ability to calculate water saturation (Sw) using Archie's equation.
• Pay Flag with Porosity and Sw Cutoffs.
• Ability to plot data in a form of Histogram and Scatter Plot.
• Ability to download all plots/histogram/scatterplot in a pdf format.
• Ability to export the final data (Original LAS data + Formation Evaluation data: VSH, POROSITY, SW)
• Displaying missing data(value) in LAS file as a matrix display

Some Limitations:

• Only accepting LAS file 2.0

Exciting Future Plans:

• Adding ability to adjust the plot size, in order to facilitate longer vertical log-type pdf file.
• Adding zonation/ top formation to the plot.
• Adding integrated plot where Triple Combo and Formation Evaluation tracks is available in a single plot.

Tutorial:

In this tutorial, we will go step by step to create a decent plot based on the preloaded file:

1. Upload your LAS file or use the pre-loaded file:

2. Display the well information based on the LAS file header:

3. Select the curves based on well information. The triple combo plot typically consist of Gamma-Ray, Resistivity, and Density-Neutron logs:

4. Adjusting the plot setting such as interval (top and bottom depth), color, scale, and shading:

5. You can do Volume of Shale calculation from Gamma Ray of Density Neutron. You can select porosity from Density, or Density-Neutron Combination

6. You can calculate Water Resistivity from Salinity, or use your own Rw and calculate the Water Saturation.

7. You can also plot histogram on each curve, or plotting two curves in a scatter plot.

Enjoy and Have Fun!