Accurate lithology starts at the shaker.

During drilling, samples are collected directly from the active shaker while operating under normal conditions. Using a sieve mesh and sample tray, cuttings are carefully scooped from the shaker screen to ensure a representative spot sample.

Washing is done gently using low-pressure water only. High pressure can wash away soft and fine formations such as anhydrite, clay, marl, and fine sand, leading to loss of material and incorrect rock percentages.

After washing, the sample is separated into fine and coarse grain sizes using sieves. A balanced mix of both fractions is then prepared to represent the formation accurately.

Lithology identified:
-Limestone: 80%
-Claystone: 20%
-Cavings: Trace

Small steps at the shaker make a big difference in subsurface interpretation.