ChromaStratigraphy® Analysis and Correlation



ChromaLog® analysis is the revolutionary new technique for lithologic formation logging and identification that was developed by Ellington & Associates. For years we observed significant color variation while processing washed well cuttings and core rock samples. These variations were not investigated, because there was no accurate way to define the observed color changes or measure them. The use of color as a descriptive tool for geologic samples has traditionally relied upon qualifying modifiers such as “light” or “dark” to describe the varied range of rock values and hues. Attempts at more systematic methods have relied upon descriptive systems, such as Munsell Soil Color Charts, but without graphical methods to display the data, it was difficult to identify and see patterns.

In 2010, we decided to see if sample color could be captured digitally, standardized, and used as a correlation tool. After years of research and experimentation we have developed a procedure using patented protocols and proprietary software to prepare and analyze oil well samples for color. This data is processed through advanced techniques and matrices to add the visual punch of the measured color profile to the Chromalog™.

ChromaLog® Analysis:

  • Quantifies variations and changes in color observed in strata
  • Accurate color and spectral measurements
  • Spectroscopic data transformed into easily readable well log format
  • Subjectivity of traditional lithological descriptions (e.g., light gray) removed
  • Results repeatable and reproducible

Well Logs from Cuttings

  • Why use cuttings?
  • What are the benefits of cuttings?
  • Creating well logs from cuttings in the lab or field
  • Color analysis logs (ChromaLogs®)
  • Geochemical/Mineral Logs
  • Petrophysical Properties
  • Paleontological logs
  • On-site analysis and well log generation

What is ChromaStratigraphy?

  • Quantitative measurement of color
  • Display of chromatic data in well log form
  • Interpretation and correlation using color data

Factors that Influence Color

  • Mineralogy
  • Lithology
    • Grain size
    • Cementation
  • Thermal history
  • Geochemistry
    • Inorganic compounds (sulfides, etc.)
    • Organic compounds (TOC)
    • Redox conditions at deposition (i.e., anoxia)
    • Post-depositional chemical alteration

Well "A" ChromaLog

  • Obvious color variations with depth

ChromaLog Comparison

  • Integrated Display with GR and ChromaLog results

High-res ChromaStratigraphy

  • Correlation based on 5-foot samples

Regional Correlations

  • ChromaStratigraphy correlation from local basin-scale

Legacy Samples

  • Correlations with Chroma-Stratigraphy® can be created from archived and legacy samples

Directional Wells

  • Extrapolate from established color groups to classify samples without paleo control
  • Predict formations based on known data relationships
  • Lab or field application


  • Color can be a proxy for TOC

ChromaLog® is Worldwide


Utica Ohio/Pennsylvania


Bossier/ Haynesville Louisiana


Eagle Ford


Paleocene/Eocene Boundary





Saudi Arabia




Equatorial Guinea

West Africa

Paleocene to Miocene

Gulf of Mexico





Learn More:
ChromaStratigraphy: The New Stratigraphic Analysis Tool

ChromaStratigraphy: Colors Are The Clues

ChromaStratigraphy®: the New Stratigraphic Analysis Tool -From PPT


Contact Ellington and Associates, Inc. today for more information about ChromaStratigraphy® analysis and correlation 713-956-2838.

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