Biodegradation of seep oils in the Wessex Basin - a complication for correlation

被引：8

作者：

Bigge, MA ^{[1
]}

Farrimond, P ^{[1
]}

机构：

[1] Univ Newcastle Upon Tyne, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

来源：

DEVELOPMENT, EVOLUTION AND PETROLEUM GEOLOGY OF THE WESSEX BASIN | 1998年 / 133卷

关键词：

D O I：

10.1144/GSL.SP.1998.133.01.19

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

A detailed organic geochemical investigation of seep oils from the Dorset coast has revealed notable variation in both the extent and pathways of biodegradation. All the seep samples analysed from Mupe Bay, Stair Hole (near Lulworth Cove) and Osmington Mills have had their n-alkanes and acyclic isoprenoid alkanes removed, but some samples are more extensively degraded, with partial loss of steranes and/or hopanes. At Mupe Bay (conglomerate matrix samples; see Parfitt & Farrimond 1997 this volume) the hopanes have been preferentially attacked, whilst at Stair Hole the steranes appear heavily degraded although there has been no alteration to the hopane distribution, 25-Norhopanes were not detected in any of the samples. Biological marker distributions of seep oils which have suffered no hopane or sterane biodegradation are compared with those of three reservoired oils from the area (Wytch Farm and Kimmeridge fields). Molecular parameters indicate significant variation in source rock facies and maturity within the oils of the Wessex Basin.

引用

页码：373 / 386

页数：14

共 31 条

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