Table 2 Criteria for identifying and classifying lithologies.

From: An improved method for predicting the permeability of Chang 7 shale oil reservoirs based on lithology and hydraulic flow units

Lithology

Ilith

Evaluation parameter values

Fine sandstone

 > 3

1

Argillaceous siltstone

1.5 < Ilith ≤ 3

2

Silty mudstone

 − 0.5 < Ilith ≤ 1.5

3

Mudstone

 ≤  − 0.5

4

Back to article page