Cross-plot

File:Neutron porosity gamma-ray intensity crossplot.svg for the interpretation of water saturation and clay content using well log data]]

A cross-plot, also called crossplot or cross plot,{{Cite book |last=Howarth |first=Richard J. |url=http://link.springer.com/10.1007/978-3-319-57315-1 |title=Dictionary of Mathematical Geosciences: With Historical Notes |date=2017 |publisher=Springer International Publishing |isbn=978-3-319-57314-4 |location=Cham |language=en |doi=10.1007/978-3-319-57315-1|bibcode=2017dmgh.book.....H }} is a type of plot used in Earth science to describe relationships for two or more variables.{{Cite journal |last1=Rasaq |first1=B |last2=Igwenagu |first2=Cl |last3=Onifade |first3=Ys |date=2015-10-08 |title=Cross plotting of Rock Properties for Fluid and Lithology Discrimination using Well Data in a Niger Delta Oil Field |url=http://www.ajol.info/index.php/jasem/article/view/123172 |journal=Journal of Applied Sciences and Environmental Management |volume=19 |issue=3 |pages=539 |doi=10.4314/jasem.v19i3.25 |issn=1119-8362|doi-access=free }} Most plots referred to as cross-plots are scatter plots, but combinations of different charts and diagrams can be common (e.g. histograms).{{Cite journal |last1=Cao |first1=Maojun |last2=Gao |first2=Zhiyong |last3=Yuan |first3=Ye |last4=Yan |first4=Zhao |last5=Zhang |first5=Yihong |date=2022-04-01 |title=A Visualization and Analysis Method by Multi-Dimensional Crossplots from Multi-Well Heterogeneous Data |journal=Energies |language=en |volume=15 |issue=7 |pages=2575 |doi=10.3390/en15072575 |doi-access=free |issn=1996-1073}} The axes of the plot are commonly linear, but may also be logarithmic.{{cite web |title=crossplot |website=Energy Glossary |url=https://glossary.slb.com/en/terms/c/crossplot |access-date=2023-01-27}}

Cross-plots are used to interpret geophysical (e.g., amplitude versus offset analysis), geochemical, and hydrologic data.