【摘要】：對(duì)渤海灣盆地一系列生物降解原油的色譜—質(zhì)譜分析結(jié)果表明,廟西凹陷PL15-8D與PL9-4井四個(gè)嚴(yán)重生物降解原油三環(huán)萜烷系列分布較為異常,主要表現(xiàn)為以C_(23)為主峰的后峰型、C_(20)與C_(23)為主峰的微弱雙峰型以及以C_(20)與C_(24)為主峰的雙峰型分布模式。強(qiáng)烈的生物降解作用導(dǎo)致C_(19)~C_(23)三環(huán)萜烷優(yōu)先于C_(24)+三環(huán)萜烷被不同程度地侵蝕,是形成這一異常分布的根本原因。三環(huán)萜烷系列相對(duì)豐度與絕對(duì)濃度的變化規(guī)律表明,不同碳數(shù)三環(huán)萜烷的生物降解作用同時(shí)發(fā)生,但其降解速率有明顯差別,即抗生物降解能力不同。三環(huán)萜烷系列化合物(除C_(20)三環(huán)萜烷以外)的抗生物降解能力具有隨碳數(shù)增加而增強(qiáng)的趨勢(shì),而C_(20)三環(huán)萜烷抗降解能力似乎強(qiáng)于C_(21)~C_(23)三環(huán)萜烷。原油中未檢測(cè)到脫甲基三環(huán)萜烷,表明三環(huán)萜烷的降解并非通過(guò)微生物的脫甲基化作用,推測(cè)其降解途徑是微生物氧化三環(huán)萜烷C環(huán)支鏈末端的甲基,形成對(duì)應(yīng)的羧酸化合物。四個(gè)原油樣品甾烷、藿烷與三環(huán)萜烷被微生物嚴(yán)重侵蝕,不能用于油源對(duì)比研究,而三芳甾烷未受生物降解影響,可作為研究區(qū)嚴(yán)重生物降解原油油源對(duì)比的有效指標(biāo)。
[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.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)能源學(xué)院/海相儲(chǔ)層演化與油氣富集機(jī)理教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)地質(zhì)大學(xué)(北京)能源學(xué)院/頁(yè)巖氣勘察與評(píng)價(jià)國(guó)土資源部重點(diǎn)實(shí)驗(yàn)室;中海石油(中國(guó))有限公司天津分公司;
【基金】：中海石油(中國(guó))有限公司天津分公司科技項(xiàng)目(CCL2015TJXZSST0436)~~
【分類號(hào)】：P618.13

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本文編號(hào)：2198556