Oil-source correlations for high and over matured marine source rocks in South China
Oil-source correlations for high and over matured marine source rocks in South China
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发表时间：
2005
影响因子：
7.5
通讯作者：
C. Jianping
中科院分区：
文献类型：
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作者：
C. Jianping
中国南方海相烃源岩普遍发育镜质组反射率（Ro）分别在1.3%和2%以上的高成熟和过成熟烃源岩，发现了丰富的古油藏和油迹，常用的生物标志化合物异戊二烯、甾烷和萜烷已用于油源对比。随着成熟度的提高，从原油、沥青和烃源岩中提取的生物标志物可能会形成相似的发育模式，失去其原有的意义，难以用于对比，这可能是一个大问题。碳同位素组成显示出明显的热演化分馏，难以进行精确对比。对十万大山盆地样品的研究表明，在高成熟和过成熟条件下，三芳香甾体可用于识别不同地层和岩性的烃源岩，包括泥岩和灰岩，因此，三芳香甾体很可能成为高成熟和过成熟条件下对比的有效工具。对比表明，华南地区有效烃源岩主要为泥岩，而不是碳酸盐岩。该对比方法和生物标志物可广泛应用于我国南北高成熟、过成熟烃源岩的油源对比。
The high and over matured marine source rocks, with vitrinite reflectance value (R_o) over (1.3%) and 2%, respectively, widely developed in South China, in which abundant paleo-oil traps and oil showing have been found. Some common biomarkers as isoprenes, sterane and terpane have been used for correlating of oil and source. With the increase of maturity, it might be a big problem since the biomarkers extracted from oils, bitumen and source rocks would become a similar developing pattern, lose their original significations and are hardly to be used for the correlations. The carbon isotopic composition shows a clear fractionation of thermal evolution and it is difficult for precious correlating. The researches on the samples from Shiwandashan Basin suggest that triaromatic steroid could be practically used for identifying different strata and lithological rocks, including mudstone and limestone source rocks, under high and over matured conditions, so triaromatic steroid is very likely to be an effective tool for correlating in these cases. Correlations show that the effective source rocks in South China are mainly mudstone but not carbonate. This correlation method and biomarkers could be widely used for oil-source correlation of high and over matured source rocks developed in either north or south China.