抄録
In this paper, as a series of studies concerning the carbonate source rocks, characteristics of Rock-Eval analysis and petroleum derived from carbonate source rocks are discussed.
Many Tmax values of Rock Eval analyses of carbonate source rocks indicate early mature or immature stage, though those rocks generated reservoir petroleum. And a few Tmax values indicate over mature stage.
The kerogen type is the oil prone I or II.
The pristane/phytane ratio and the saturate/aromatic hydrocarbon ratio are increase with maturation.
Oil gravity and sulfur content are controlled by maturation and the low matured oils are heavy and have high sulfur contents and the high matured oils are light and have low sulfur contents. As the oil generated from carbonate rocks may have a tendency of low maturation, consequently the tendencies that the oil generated from carbonate source rocks are heavy and have high sulfur contents may be recognized.
The CPI values of n-alkane extracted from oil are 1 or less than 1.
