Diamondoid hydrocarbon ratios as indicators of biodegradation in Australian crude oils

被引:178
作者
Grice, K [1 ]
Alexander, R [1 ]
Kagi, RI [1 ]
机构
[1] Curtin Univ Technol, Sch Appl Chem, Ctr Petr & Environm Organ Geochem, APCRC, Perth, WA 6001, Australia
关键词
diamondoids; adamantane; diamantane; methyladamantanes; methyldiamantanes; biodegradation; thermal maturity; Carnarvon Basin; Gippsland Basin;
D O I
10.1016/S0146-6380(99)00137-0
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The effect of biodegradation on diamondoid distributions in petroleum has been investigated on a series of crude oils reservoired in two Australian sedimentary basins, the Gippsland Basin and the Carnarvon Basin. The ratio of methyladamantanes to adamantane rises with increasing biodegradation. Significant changes in the ratio occur at extreme levels, indicating that diamondoids can be indicators of petroleum biodegradation especially when most other hydrocarbons have been removed. The methyladamantane/adamantane ratio can also be used to assess the composition of crude oils that are comprised of a mixture of severely biodegraded and non-biodegraded oil. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:67 / 73
页数:7
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