庙西凹陷严重生物降解原油序列中三环萜烷的异常分布成因初探
发布时间：2018-08-23 09:01
【摘要】：对渤海湾盆地一系列生物降解原油的色谱—质谱分析结果表明,庙西凹陷PL15-8D与PL9-4井四个严重生物降解原油三环萜烷系列分布较为异常,主要表现为以C_(23)为主峰的后峰型、C_(20)与C_(23)为主峰的微弱双峰型以及以C_(20)与C_(24)为主峰的双峰型分布模式。强烈的生物降解作用导致C_(19)~C_(23)三环萜烷优先于C_(24)+三环萜烷被不同程度地侵蚀,是形成这一异常分布的根本原因。三环萜烷系列相对丰度与绝对浓度的变化规律表明,不同碳数三环萜烷的生物降解作用同时发生,但其降解速率有明显差别,即抗生物降解能力不同。三环萜烷系列化合物(除C_(20)三环萜烷以外)的抗生物降解能力具有随碳数增加而增强的趋势,而C_(20)三环萜烷抗降解能力似乎强于C_(21)~C_(23)三环萜烷。原油中未检测到脱甲基三环萜烷,表明三环萜烷的降解并非通过微生物的脱甲基化作用,推测其降解途径是微生物氧化三环萜烷C环支链末端的甲基,形成对应的羧酸化合物。四个原油样品甾烷、藿烷与三环萜烷被微生物严重侵蚀,不能用于油源对比研究,而三芳甾烷未受生物降解影响,可作为研究区严重生物降解原油油源对比的有效指标。
[Abstract]:The chromatography-mass spectrometry analysis of a series of biodegradable crude oils in Bohai Bay Basin shows that the distribution of tricyclic terpene series of four serious biodegradable crude oils in PL15-8D and PL9-4 wells in Miaoxi sag is abnormal. It mainly shows the weak bimodal pattern with C _ (20) and C _ (23) as the main peak, and the double peak distribution pattern with C _ (20) and C _ (24) as the main peaks, respectively, with C _ (23) as the main peak and C _ (20) and C _ (23) as the main peaks. The strong biodegradation of C _ (19) C _ (23) trichloroterpene is the root cause of the abnormal distribution of C _ (19) C _ (23) trichloroterpene, which is prior to the erosion of C _ (24) tricyclic terpene to varying degrees. The variation of relative abundance and absolute concentration of tricyclic terpene series showed that the biodegradation of tricyclic terpenes with different carbon numbers occurred simultaneously, but the degradation rate of tricyclic terpenes was obviously different, that is, the ability to resist biodegradation was different. The anti-biodegradability of tricyclic terpene compounds (except C20 tricyclic terpenes) has a tendency to increase with the increase of carbon number, while C20 tricyclic terpene seems to be stronger than C21 / C23 trichloroterpene. No demethyltricyclic terpene was detected in crude oil, which indicated that the degradation of tricyclic terpene was not through the demethylation of microorganism. It was assumed that the degradation pathway was the microbial oxidation of methyl at the end of the C ring branching chain of tricyclic terpene to form the corresponding carboxylic acid compound. Four crude oil samples, sterane, hopane and tricyclic terpene were seriously eroded by microbes and could not be used for oil source correlation study, while triarosteranes were not affected by biodegradation, which could be used as an effective index for oil source correlation of severe biodegradable crude oil in the study area.
【作者单位】： 中国地质大学(北京)能源学院/海相储层演化与油气富集机理教育部重点实验室;中国地质大学(北京)能源学院/页岩气勘察与评价国土资源部重点实验室;中海石油(中国)有限公司天津分公司;
【基金】：中海石油(中国)有限公司天津分公司科技项目(CCL2015TJXZSST0436)~~
【分类号】：P618.13
本文编号：2198556
[Abstract]:The chromatography-mass spectrometry analysis of a series of biodegradable crude oils in Bohai Bay Basin shows that the distribution of tricyclic terpene series of four serious biodegradable crude oils in PL15-8D and PL9-4 wells in Miaoxi sag is abnormal. It mainly shows the weak bimodal pattern with C _ (20) and C _ (23) as the main peak, and the double peak distribution pattern with C _ (20) and C _ (24) as the main peaks, respectively, with C _ (23) as the main peak and C _ (20) and C _ (23) as the main peaks. The strong biodegradation of C _ (19) C _ (23) trichloroterpene is the root cause of the abnormal distribution of C _ (19) C _ (23) trichloroterpene, which is prior to the erosion of C _ (24) tricyclic terpene to varying degrees. The variation of relative abundance and absolute concentration of tricyclic terpene series showed that the biodegradation of tricyclic terpenes with different carbon numbers occurred simultaneously, but the degradation rate of tricyclic terpenes was obviously different, that is, the ability to resist biodegradation was different. The anti-biodegradability of tricyclic terpene compounds (except C20 tricyclic terpenes) has a tendency to increase with the increase of carbon number, while C20 tricyclic terpene seems to be stronger than C21 / C23 trichloroterpene. No demethyltricyclic terpene was detected in crude oil, which indicated that the degradation of tricyclic terpene was not through the demethylation of microorganism. It was assumed that the degradation pathway was the microbial oxidation of methyl at the end of the C ring branching chain of tricyclic terpene to form the corresponding carboxylic acid compound. Four crude oil samples, sterane, hopane and tricyclic terpene were seriously eroded by microbes and could not be used for oil source correlation study, while triarosteranes were not affected by biodegradation, which could be used as an effective index for oil source correlation of severe biodegradable crude oil in the study area.
【作者单位】： 中国地质大学(北京)能源学院/海相储层演化与油气富集机理教育部重点实验室;中国地质大学(北京)能源学院/页岩气勘察与评价国土资源部重点实验室;中海石油(中国)有限公司天津分公司;
【基金】：中海石油(中国)有限公司天津分公司科技项目(CCL2015TJXZSST0436)~~
【分类号】：P618.13
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1 王铁冠;一种新发现的三环萜烷生物标志物系列[J];江汉石油学院学报;1989年03期
2 陈安定;赵俊峰;漆建华;邵满军;;三环萜烷、甾烷分布用于南图尔盖盆地油源对比[J];新疆石油地质;2013年05期
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