东营凹陷生物降解稠油甾烷分子的选择蚀变

doi:10.11867/j.issn.1001-8166.2012.10.1108

地球科学进展 doi: 10.11867/j.issn.1001-8166.2012.10.1108

东营凹陷生物降解稠油甾烷分子的选择蚀变

陈中红 ¹, Moldowan J M ², 刘昭茜 ³

1.中国石油大学（华东）地球科学与技术学院,山东青岛 266555;
2.Department of Geological and Environmental Sciences, Stanford University, California, USA;

3.中国地质大学资源学院，湖北武汉 430074

收稿日期:2012-07-24 修回日期:2012-08-23 出版日期:2012-10-10
基金资助:
国家自然科学基金项目“超压湖盆原油裂解成气门限及动力学模型”(编号：40802026)；山东省自然科学基金项目“山东东部湖相页岩气形成机制与成藏条件”(编号：ZR2011DM004)；中央高校基本科研业务费专项资金资助.

Selective Alteration of Steranes in Heavy Biodegraded Oils from Dongying Sag

Chen Zhonghong ¹, Moldowan J M ², Liu Zhaoqian ³

1.School of Geoscience, China University of Petroleum, Qingdao 266555, China;
2.Department of Geological and Environmental Sciences, Stanford University, California, USA;
3.School of Resources, China University of Geosciences, Wuhan 430074, China

Received:2012-07-24 Revised:2012-08-23 Online:2012-10-10 Published:2012-10-10

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为分析生物降解原油中甾烷生物标志物分子发生选择性蚀变的先后顺序及生物降解作用对甾烷分子成熟度参数的影响，在渤海湾盆地东营凹陷广饶潜山油藏选择了发生不同程度生物降解作用的原油，利用色谱质谱(GC-MS)仪对其中甾烷进行了定量测试分析和对比。结果发现在生物降解过程中，不同级别的生物降解作用对甾烷具有不同程度的影响：6级以下的生物降解作用对甾烷的降解能力有限，甾烷及其相关化合物比值没有可以识别的改变；6级以上的严重生物降解作用会对甾烷生物标志物的相关参数产生显著的影响。在严重生物降解原油中（级别≥6）：甾烷系列被降解和蚀耗的先后顺序为，ααα 20R>αββ 20R>αββ 20S≥ααα 20S，C₂₇>C₂₉>C₂₈，规则甾烷优先于重排甾烷发生降解，C₂₇，C₂₈，C₂₉甾烷优先于C₂₀，C₂₁甾烷发生降解；甾烷生物标志物分子参数C₂₉20S/(20S+20R)，C₂₉ ββ/(ββ+αα)会发生显著升高，不能真实反映成熟度大小。研究结果为正确评价生物降解原油的成熟度及甾烷生物标志物分子的选择性蚀变提供了新的科学依据。

关键词:

生物降解作用, 甾烷, 生物标志物, 成熟度参数, 东营凹陷

The alkane and aromatic fraction of eleven biodegraded oils and five non-biodegraded oils from the Dongying Depression, Bohai Bay Basin, Eastern China were analyzed by GC-MS to investigate the effects of biodegradation and thermal maturation on the distributions of steranes. The results indicate that the biodegradation and depletion of steranes emerged in the heavily biodegraded oils (scale≥6). The oil samples show an increase in the C₂₉sterane C₂₉20S/(20S+20R) and C₂₉ββ/(ββ+αα) thermal maturity parameters in the heavily biodegraded oils, indicating this level of biodegradation(scale≥6) can alter the two maturity parameters. The selective depletion of C₂₇-C₂₉steranes follows the order ααα 20R>αββ 20R>αββ 20S≥ααα 20S and C₂₇>C₂₉>C₂₈, and the diasteranes and C₂₀-C₂₁steranes were much more resistant to biodegradation than regular C₂₇-C₂₉ steranes.

Key words: Biodegradation, Sterane, Biomark, Maturity parameters, Dongying sag

中图分类号:

P618.130.1

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