Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| type | total gas content/(m3/t) | TOC/(%) | siliceous minerals/% | clay minerals/% | lithofacies |
|---|---|---|---|---|---|
| I | >3.0 | >3.0 | >55 | <28.0 | I2 |
| II | 2.0–3.0 | 2.0–3.0 | 40.0–55.0 (or higher than 40) | 20.0–32.0 (or lower than 32) | I2, II1, II6 |
