There are four columns on hand-drawn geologic well logs including the Residue Column, the Percentage Column, the Rock Column and the Description Column. The computer-generated logs contain three columns including the Residue Column, the Percentage Column and the Description Column.
The Residue Column contains information describing the colors and textures of any shale, quartz, chert and silicified fossils that remain after the rock cuttings are digested in hydrochloric acid. The Percentage Column contains information describing the percentage and lithology of each rock type present in undigested rock cuttings. The Rock Column is used to describe the color and crystalline texture of the carbonate rock (hand-drawn logs only). The Description Column on hand-drawn logs contains chemical formulas of any associated minerals and any additional information about the rock. The Description Column on computer-generated logs contains information about associated minerals and rock color and crystalline texture.
Well Log Symbols Key
The colors and symbols are categorized according to the column(s) in which they appear on the logs. The column in which a color or symbol resides defines the meaning of that color or symbol.
Well Drilling Logs Viewer
Well Drilling Logs Viewer - Locate, display and download well logs