中国南方下古生界碳酸盐生油岩的成岩方式与烃类初次运移关系探讨

DISCUSSION ON RELATIONSHIP BETWEEN THE DIAGENESIS OF CARBONATE SOURCE ROCKS AND PRIMARY MIGRATIONOF HYDROCARBONS IN LOWER PALEOZOIC OF SOUTH ERN CHINA

陈彦华 刘莺

Chen Yanhua Liu Ying

地质矿产部石油地质中心实验室

Central Laboratory of Petroleum Geology, Ministry of Geology and Mineral Resources

碳酸盐岩生油岩存在两种不同的成岩方式,对应着两种不同的运移和聚集条件,从而决定了两个不同的油气普查勘探方向。盆地区的碳酸盐岩生油岩足有效的生油岩,台地区的碳酸盐岩生油岩则不是有效的生油岩。

Based on the studies of relationship between the diagenesis of marine carbonate source rocks and the migration of hydrocarbons in Lower Paleozoic of Southern China, it is suggested that there are two different diagenesis, two carbonate source rocks, two different related conditions for the migration and the accumulation of oil/gas. Therefore,two different guidelines of peroleum exploraton are decided. The carbonate source rocks in basin area formed dominantly under compaction in a deep buried environment and they are the effective source rocks for the generation of oil and gas. The carbonate source rocks in platform mainly formed in cementation near surface environment. Since the lithification of such a kind of source rocks takes place before the migration of hydrocarbons, it lacks of primary migration of hydrocarbons and the source rocks are uneffcient. In this paper, it also points out that the occurrence of migrated bitumen is the key point and the evidence for the understanding of migration condition and path in those source rocks.

https://doi.org/10.11781/sysydz198702098