Explore relationships
Colour points by another curve using six palettes. Set manual colour limits or keep the full-curve range. Filter one curve with up to two AND conditions.
WELL DATA × RELATIONSHIPS
Well log crossplot.
Explore LAS curve relationships with colouring, filters, selections and regression.
Load a LAS to save or restore its plot settings.
Changes apply instantly. Size: 1–20 px; leave blank for Auto.
Curve colouring is active. Choose Uniform point colour in Colouring to use a single colour. Shape and size still apply.
Drag action
Choose Select points, then draw around the points. Release to close the lasso and select. Click for a single point; Esc cancels. Axes stay fixed.
Linear: Y = a + bX. Fits original values; needs at least 2 different X values.
Thickness: 1–20 px. Fits selected points and extends across the current view in the selection colour.
Upload a LAS file to choose a colour curve.
Auto uses the full LAS curve. Colour limits stay fixed when zooming or selecting. Selected points keep their selection colour.
Filter
Your next insight starts here.
Load a LAS file and choose your X and Y curves.
We’ll take care of the plot.
— plotted pairs— missing pairs excluded0 non-positive pairs excluded0 pairs filtered outLINEAR AXES
Linear regression
Built for a closer look at your well data.Download sample LAS
Crossplot well-log curves from a LAS file
Compare any two numeric curves, including density–neutron and density–sonic pairs. Select linear or logarithmic axes, reverse their directions and inspect each sample. Processing happens in your browser.
Select and fit
Draw a lasso, add or remove points, and fit linear, polynomial, power or exponential models. Regressions use selected rows that pass the active filter.
Reproduce the result
Save axis limits, viewport, colours, filter, selections and fit settings as JSON. Export a labelled PNG of the current view.
Understand density–neutron crossover · Complete Crossplot reference · Try the synthetic example