Page 157 - Geology and Geochemistry of Oil and Gas

TABLE 7.3 ORGANIC
MATTER
Approximate subclarke values of organic matter (OM) components in various sedimentary rocks at catagenetic stages MC 4 and lower (after Vassoyevich, 1973) SOLUBLE
Rock TOC (%) Bitumen (chloroform-extractable bitumen) Hydrocarbon content (%)
13
Content (%) Total mass in continental deposits (10 t) In rock In OM In bitumen IN
In rock In OM ORGANIC

Clays 0.9 0.06 5 36 0.02 1.7 30
Silts 0.45 0.03 5 5.7 0.01 1.7 30
Sands 0.2 0.016 6 2.6 0.005 1.9–1.95 40
Carbonates 0.2 0.03 11–12 6.3 0.012 1.9–1.95 32 SOLVENTS
Salts, sulfates 0.1 0.01 7.5–8 0.04 0.003 2.3 30
Coals 67 0.8 0.9–0.95 0.025 0.15 0.2–0.25 18–20
Oil shales 16.5 1 4.5–5 0.06 0.2 0.5–0.1 20
Dominikites, Bazhenovites 6 0.6 7.5–8 1.8 0.25 4–4.2 40–45
All continental rocks (excluding lavas) 0.62 0.045 5.4–5.8 52.5 0.0115 1.8–2 34–35 127