共查询到20条相似文献，搜索用时 24 毫秒
1.
芳基类异戊二烯生标在指相上的应用 总被引：3，自引：0，他引：3
芳基类异戊二烯化合物被认为是高盐和强还原沉积环境中沉积有机质芳烃馏分中的特征性生物标志物。本文在对采自我国三个典型陆相油气盆地的33个原油和生油岩样品芳烃馏分中的生物标志化合物进行了详细研究的基础上,着重讨论了鄂尔多斯盆地中生界-原油样品中芳基类异戊二烯系列化合物的检出及其在指相上的地球化学意义,指出该系列化合物还可指示微咸水和还原的沉积环境。 相似文献
2.
前寒武纪地层中的生物标志物与生命演化 总被引：6，自引：1，他引：5
对山西五台、北京十三陵和河北蓟县前寒武纪２．５～０．８５Ｇａ岩样中生物标志物地分析研究,发现了正烷烃、类异戊二烯烷烃、烷基环已烷、烷基甲基环已烷、五环三萜烷以及甾烷类等,讨论了生物标志物与前寒武纪生物的演化,提出类异戊二烯是合成早期生物的重要单体,２．５Ｇａ前寒武纪时期,已经产生了厌氧光合细菌和真核生物,原核生物的生成时期可能早于２．５Ｇａ。 相似文献
3.
4.
北部湾原油中的生物标志物及其地质—地球化学意义 总被引：1，自引：0，他引：1
本文利用全油饱和烃ＧＣ／ＭＣ分析提供的信息，对北部湾原油中的生物标志物进行了全面鉴定和研究，重点讨论了长链异戊间二烯烃，二环倍半萜烷，开环霍烷以及４－甲基甾烷的生源。并用生物标志物组成分布特征进行了原油类型划分和详细的油源对比研究。 相似文献
5.
形成于贫营养型高地沼泽的云南金所泥炭藓软褐煤的链烃主要由正烷烃组成，异戊二烯类烃含量甚低，含少量陆源三萜烯。芳烃馏分主要由三芳，四芳三萜类和两个未知化合物组成。前者具典型陆源输入的奥利烷或乌散烷分子骨架，褐煤Rren^0仅0.24%，但芳构化作用已十分强烈，且芳烃主要由芳构化陆源三萜类组成。 相似文献
6.
克拉玛依原油的生物降解作用 总被引：6，自引：0，他引：6
克拉玛依原油具同源性。抗生物降解强度的序列依次为：正构烷烃、类异戊间二烯烷烃、二环倍半萜、γ-胡萝卜烷、规则甾烷(20R型)、β-胡萝卜烷、规则邕烷(20S型)、妊甾烷、高妊烷、五环三萜烷、C20-C29三环二萜烷、重排甾烷、13、17开环甾烷。此外，还有更强的抗生物降解的生物标志物，25-降藿烷等。 相似文献
7.
塔东2井原油为高密度、粘度大，δ^13C相对较重的稠油。原油中轻烃、环状萜类、甾烷及芳香甾烷组成与分布均具有海相原油的特点。具有时代意义生物标志物的油源对比结果表明，该原油来源于寒武系烃源岩，具有自生自储特点。高反射率热解沥青的存在、芳烃馏分中高含量的多元稠环芳烃及正构烷烃碳同位素相对较重的特点，表明原油在成藏后经历了短期高温热事件的影响。 相似文献
8.
9.
迄今应用生物标志物时,主要采用甾烷、萜烷等的分布与相对比值,而忽视了其绝对含量。生物标志物的定量为其在石油勘探中的应用提供了一个重要的、新的方向。最近,J·Rullk(?)tter等首次定量研究了北美Williston盆地四十余个原油样的甾烷与三萜烷含量,发现其含量相差达百余倍,从而证明定量研究有助于原油的分类对比。 相似文献
10.
银额盆地查干凹陷原油地化特征及油源对比 总被引：11，自引：1，他引：11
银额盆地东部查干凹陷首次发现轻质低硫成熟原油，其饱和径含量在90％以上，成熟度相当于镜煤反射率Ro1．0％左右，是生油高峰阶段的产物；原油全碳同位素δ^13C值－31．1‰。原油生物标志物中类异戊二烯含量较高，植烷与姥皖烷均势；三环萜烷含量高于五环萜烷；含有较高的TS C29、Ts、C30重排藿烷、伽马蜡烷；藿烷中以C50藿烷为主，C32以上升藿烷含量极低；孕甾烷含量高；甾烷中以C29甾烷为主，C27甾烷含量也较高，异胆甾烷含量高于胆甾烷；重排甾烷含量低；甾烷的含量与萜烷含量相当，是典型的湖相原油。已发现的天然气中甲烷含量达80％，为湿气。原油和源岩生物标志物组成特征分析对比表明下白垩统巴音戈壁组源岩是主要油源岩。生物标志物特征示原油具有一定的运移效应。 相似文献
11.
Jürgen Rullkötter Baruch Spiro Arie Nissenbaum 《Geochimica et cosmochimica acta》1985,49(6):1357-1370
A detailed GC/MS study of biological marker compounds in the saturated and aromatic hydrocarbon fractions of oils and asphalts from the Dead Sea area, Israel, provided decisive information to the solution of a long-lasting controversy by showing that the asphalts are products of early generation in an immature stage from the same type of carbonate source rock which generated more mature oils. The asphalts are not biodegraded residues of the oils.Oils from six different wells, and asphalts from wells, outcrops, and a floating block from the Dead Sea all have very similar sterane and triterpane patterns. They all lack rearranged steranes (diasteranes) indicating a carbonate source matrix and compare reasonably well with a sample of Upper Cretaceous bituminous chalk from Nebi Musa. The main difference between the oils and the asphalts is a significantly higher triaromatic to mono- plus triaromatic steroid hydrocarbon ratio in the former. This is explained as a result of rapid subsidence and heating of their source rock close to the deep parts of the Dead Sea graben. The oils thus were generated in the more deeply buried source rock blocks under the graben fill, whereas the asphalts either originate from an immature source rock section closer to the graben rims or represent an earlier phase of generation and expulsion.This study also provides general information on the evolution of biological markers in carbonate source rocks. Low-activation-energy processes, like isomerisation of steranes, appear to occur much faster at low temperatures than in shales. The high sulfur content and less cross-linking of the biogenic organic matter into a complex kerogen structure are suggested to be responsible for this. Care should be taken when using only sterane isomerisation to assess the maturity of hydrocarbons from carbonate rocks and of carbonate-derived oils. 相似文献
12.
Ercin Maslen Kliti Grice Pierre. Le MétayerDaniel Dawson Dianne Edwards 《Organic Geochemistry》2011,42(4):387-398
The present study aims to establish the factors controlling the stable carbon isotopic compositions (δ13C) of individual aromatic hydrocarbons analysed by compound specific isotope analysis (CSIA) in crude oils from western Australian petroleum basins of varying age and facies type. This paper reports δ13C values of individual aromatic hydrocarbons, like alkylbenzenes, alkylnaphthalenes, alkylphenanthrenes and methylated biphenyls. The main aims are to confirm the origin (source) and age of these oils based on CSIA of selected aromatic compounds and to understand why the Sofer plot is ineffective in establishing the source of western Australian petroleum systems. The bulk δ13C of saturated and aromatic hydrocarbon fractions of crude oils have been previously used to differentiate sources, however, many Australian crude oils are not classified correctly using this method. The oils were classified as marine by the δ13C values of individual aromatic compounds and as terrigenous based on the bulk δ13C data (Sofer plot).The oils where the δ13C values of 1,6-DMN and 1,2,5-TMN isomers are most negative are indicative of a marine source, whereas oils with a less negative values for the 1,6-DMN and 1,2,5-TMN isomers are derived from marine source rocks that contain a significant terrigenous component. Similarly, oils with the least negative δ13C values for the 1-MP and 1,9-DMP isomers reflect varying inputs of terrigenous organic matter to the their marine source rocks. Plots of P/DBT and Pr/Ph concentration ratios versus δ13C values of DMP, 1,6-DMN, 1,2,5-TMN, 1-MP and 1,9-MP are constructed to establish the relative amount of terrigenous organic matter contributing to the source rock of a series of marine oils. The ratios of P/DBT and Pr/Ph plotted against the δ13C values of the aromatic isomers (such as 1,6-DMN, 1,2,5-TMN, 1-MP and 1,9-MP) provide a novel and convenient way to discriminate crude oils derived from different source rocks that contain varying amounts of marine and terrigenous organic matter. 相似文献
13.
The geochemical characteristics of 16 oils/condensates/seep oil/oil shows (collectively called oils) from the Eastern Papuan Basin (EPB) and one seep oil from the Western Papuan Basin (WPB) are integrated with data from previous studies of oils, fluid inclusion oils and solid bitumens from the EPB and WPB, Papua New Guinea. The combined set of samples can be divided in two major families of hydrocarbons. The Family A oils, mostly occurring in the WPB region, were generated from clay rich marine source rocks, containing predominantly terrigenous higher plant derived organic matter (OM) deposited in a sub-oxic to oxic environment. Source rock(s) for Family A oils are likely to be of Middle to Upper Jurassic, e.g., the Upper Jurassic Imburu Formation. The Family B oils, distributed mainly in the EPB region, were generated from Cretaceous or younger marine carbonate source rock(s) deposited under anoxic to sub-oxic conditions, and containing predominantly prokaryotic OM with some terrigenous higher plant inputs. The EPB natural gases analyzed in this study may be co-genetic to the co-occurring Family B oils in the EPB. Both Family A and B oils were generated at similar thermal maturities of 1.0–1.3% vitrinite reflectance equivalent. Although no source interval to date has been firmly identified in the EPB, post-Jurassic strata are a viable option, because (1) Late Cretaceous and Paleogene carbonate and clastic marine sediments including possible source lithologies are present, and (2) this section of the Papuan Basin sustained rapid sedimentation and tectonic loading, particularly in the Cenozoic. 相似文献
14.
基于40余个不同岩性烃源岩及原油饱和烃组分的GC/MS和GC/MS/MS分析资料,揭示了琼东南盆地崖城地区渐新统不同沉积相带烃源岩的生物标志物组合特征,并与崖城油气田原油进行油源精细对比,提出了新的认识。研究结果表明,海岸平原沼泽相煤及碳质泥岩呈姥鲛烷优势(Pr/Ph>5.0),三环萜烷以低碳数化合物为主(C19/C23>3.0),甾烷丰度低(藿烷/甾烷>5.0), C29甾烷优势显著(>60%),指示高等植物为主要的有机源,且沉积于氧化环境。浅海相泥岩中Pr/Ph值大多在1.0~2.5,表征弱还原-弱氧化环境;其三环萜烷以C21或C23为主峰,甾烷呈"V"字型分布,藿烷/甾烷比值小于3.0,具陆源和水生双重有机质生源。煤及碳质泥岩中奥利烷和双杜松烷等陆源标志物均较少,而泥岩中却普遍富含这些化合物,反映了近岸海相沉积有机质的特殊性。因而,在近海盆地地层中奥利烷和双杜松烷丰度并不能代表总体有机质中陆源的输入比例,更可能是指相标志。通过与烃源岩的分子地球化学对比表明,崖城油气田的主体原油兼具煤成烃和泥岩所生油的生物标志物组成,为混源油,来自渐新统不同沉积相带烃源岩。 相似文献
15.
Forty-six crude oil samples were selected from the Ordovician in the northwestern part of the Tahe oilfield for detailed molecular geochemical and isotopic analysis, including group compositions, carbonhydrogen isotopes and gas chroma-tograms of saturated hydrocarbons, as well as the characteristics of terpane, sterane and other biomarkers, indicating that crude oils are of the same origin from different districts in the Tahe oilfield and were derived from the same source kitchen (or oil source formation), i.e., mainly stemming from marine hydrocarbons. Detailed studies of oil physical properties of 25-honpane revealed that such oils have heavy or thick oil qualities due to biodegradation. Comprehensive assessment in terms of five maturity parameters shows that the oils from the Ordovician with Ro values varying from 0.80% to 1.59% are widely distributed in the northwest of the Tahe oilfield. 相似文献
16.
Six oils and seven suspected source rocks from the Jianghan saline basin, in the central eastern part of China, have been examined using a variety of geochemical techniques. The results from this study show that oils from the third and fourth sections of the Qianjiang Formation (Eocene) are derived from similar source materials but have a different source from the oils of Xingouzui Formation (Eocene) in the same basin. The oils of the Xingouzui Formation (Eocene) are more mature, and probably have a greater input of terrigenous source material and in all probability have migrated greater distances than the Qianjiang oils. Oils from these sections are derived from an environment characterized as being extremely anoxic, strongly reducing and highly saline. The suspected source rocks examined in the study were from the Qianjiang Formation and were generally mature, except for the shallowest sample. The biomarker distributions in the suspected source rocks examined from the Qianjiang Formation were very different from those of the oils present in the same sections. It is proposed that oils from the Qianjiang Formation have sources in addition to, or exclusive of, the suspected source rocks examined in this study. 相似文献
17.
The hydrocarbon occurrences of asphalts, heavy oils and oil shales in the Dead Sea area and the possible genetic relation between them have been studied. The similarity in organochemical characteristics, i.e., the elemental composition of asphaltenes, the distribution pattern of the saturated hydrocarbons and the predominance of V (over Ni)-porphyrins in both the oils and the asphalts indicate a close relation between them. On the other hand, dissimilarities in the same organochemical characteristics in both the asphalts and the oil shale exclude the hypotheses that asphalt was generated and expelled from the oil shales or that the shales were contaminated by oils. Water washing and biodegradation are considered to be the processes through which preferential depletion of hydrocarbons occurred, altering the oils to asphalts. The burial of the degraded asphalt to a relatively great depth resulted in a secondary generation of small amounts of light saturated hydrocarbons in these asphalts. The oils, which are thought to be the precursors of the asphalts, have either been flushed into the Dead Sea depression from the surrounding elevated areas or have seeped upwards from deep local accumulations in the graben. 相似文献
18.
冀中坳陷苏桥-文安地区混源油定量识别模式研究--典型原油混合实验及混源油识别模式 总被引：6，自引：1，他引：6
通过典型原油混合实验及其产物的地球化学剖析,揭示当煤成油和下第三系原油混合时,随着下第三系原油的增加,C19三环萜烷,C24四环萜烷,C30重排藿烷,C29甾烷和重排甾烷逐渐变小;而姥鲛烷和植烷,伽马蜡烷和C27甾烷含量则逐渐增加。利用饱和烃生物标志物和芳烃化合物绝对浓度的变化规律,建立了冀中坳陷苏桥-文安地区混源油定量识别模式图版。根据混源油识别的模式,判断苏49井的混源油是由10%的下第三系原油和90%的煤成油混合而成;相反文1021井混源油则是由90%的下第三系原油和10%的煤成油混合而成。 相似文献
19.
初论原油单体烃系列碳同位素分布特征与生油环境之间的关系 总被引：11，自引：2，他引：11
生油盆地主要分为陆相和海相环境，陆相盆地主要有淡水－微咸水、淡水和半咸水－咸水三种湖相沉积环境，其中不同沉积相中有机质类型和丰度不同，这反映在它们所形成原油的单体烷烃碳同位素分布上有区别。高等植物出现前后的海相沉积油源岩中有机质类型有着较为明显的差别，泥盆纪以前的成油母质以细菌、蓝绿藻等原核生物为主，而石炭纪以后以真核生物（包括浮游植物、浮游动物等）为主，这样它们所形成原油的单体烃类碳同位素分布各 相似文献
20.
塔里木盆地英买力地区原油地球化学特征与族群划分 总被引：1，自引：0，他引：1
塔里木盆地英买力地区油气成因复杂,采用多馏分、多组分化学成分分析及单体烃碳同位素分析途径,对该区海相、陆相油进行精细分析。结果表明,英买力油田主要有两大类油组,分别是南部YM2井区的海相油(I类)和北部YM7井区的陆相油(Ⅱ类),各自具有典型的海相油与陆相油的特征。进一步分析表明,两大油组内部仍有分异。将第二油组进一步分为两亚类,以中、古生界产层为主的正常黑油和重质油为一类(Ⅱa),以古近系为主的凝析油为另一类(Ⅱb)。两亚类原油正构烷烃单体烃同位素稍有差异,芳烃组成与分布具有显著差异。较之于Ⅱa原油,Ⅱb原油富含联苯系列与氧芴系列、不同类型芳烃系列中以低分子量同系物占绝对优势,其正构烷烃单体烃碳同位素更重,与相邻的羊塔克地区原油表现出一定的相似性,表明两者之间有一定的成因联系,前者可能为混源油,由位于库车坳陷中拜城凹陷提供两种陆相烃源岩。英买力地区陆相油并非以往确认的一种成因类型,可能至少由两套性质迥异的中生界烃源岩供烃。英买力地区第一类海相油(I类)尽管生物标志物特征相近,但分析原油的单体烃碳同位素具有显著差异,同样存在油气混源的可能。英买力地区海、陆相原油特征与成因的深入剖析,对于该区精细油源确认、油气成藏机制乃至油气资源评价具有重要意义。 相似文献