共查询到20条相似文献，搜索用时 687 毫秒
1.
黄骅坳陷齐家务地区的油源对比 总被引：5，自引：3，他引：2
黄骅坳陷齐家务地区储油层主要为下第三系沙河街组沙一下段白云质灰岩。该区原油具有高密度、高粘度、高含硫量、中低凝固点、高初馏点和高胶质和沥青质含量等物理性质。在地球化学特征上,高碳数正构烷烃具有明显的奇偶优势,类异戊二稀烷烃具有植烷优势,甾烷组成具有明显的C27ααα甾烷优势,沙一段泥页岩的三环萜烷不发育、伽马蜡烷比较发育。这些地球化学特征表明该区原油为未熟-低熟油。分析原油和沙一段泥页岩的伽马蜡烷/C30藿烷与C29降藿烷/C30藿烷的关系以及伽马蜡烷/C30藿烷与Pr/Ph之间的关系,并结合地球化学特征,认为齐家务地区的烃源岩主要是沙一下段的泥页岩。 相似文献
2.
鄂尔多斯盆地三叠系延长组7段(长7段)半深湖—深湖相优质油源岩是油气的重要来源,包括黑色页岩和暗色泥岩,作为盆地重要的供烃源岩一直是研究的热点。为了明确不同烃源岩的贡献及油气来源,通过对庆城地区长7段致密油特征进行分析,对原油进行精细划分,并对源岩有效性进行分析,进一步明确油源对应关系,研究表明,庆城地区长7段黑色页岩和暗色泥岩均对油气成藏有贡献,其中黑色页岩贡献最大,长73段暗色泥岩次之,长72和长71段暗色泥岩贡献较小;原油为低密度、中—低黏度和低凝固点的轻质油。根据生标物特征将原油划分为3类,A类原油具有低C30重排藿烷/C29藿烷、低C29Ts/C29藿烷、低Ts/Tm的特征,由黑色页岩贡献,主要分布于长71段;C类原油具有高C30重排藿烷/C29藿烷、高C29Ts/C29藿烷、高Ts/Tm的特征,主要由暗色泥岩贡献,... 相似文献
3.
采用有机地球化学方法对牛庄—八面河地区混源油问题进行了研究。将来自沙三段成熟源岩的牛庄油田原油和来自沙四段源岩的八面河油田原油作为端元，通过伽马蜡烷含量/C30藿烷与藿烷/甾烷交会图、重排单芳甾/C27βS单芳甾比值和芳香甾含量交会图等方法，尝试计算了原油的混合比。计算结果显示从牛庄洼陷向八面河地区沙四段来源油的比例逐渐增加且两种方法计算的混合比一致。牛庄洼陷中心以沙三段来源油占绝对优势，八面河斜坡区则是以沙四段来源油为主，而王家岗地区则二者兼而有之。 相似文献
4.
为了探讨热力作用对原油中甾烷类化合物形成和分布的影响,对塔里木盆地26个典型海相原油样品和1个热模拟样品进行系统的地球化学研究。结果表明:不同演化阶段原油中甾烷类化合物组成和分布的变化较为明显。高熟阶段原油的热裂解作用导致了甾烷类化合物含量大幅降低,过熟阶段甾烷类化合物含量的短暂升高则与原油中高分子量的烃类化合物裂解有关。随着热演化程度的增加,C27和C29规则甾烷在生成和裂解速率上的不同,致使C27/C29规则甾烷的值呈现先减小后增大的趋势,所以C27/C29规则甾烷的值在成熟-高熟阶段不能用于物源方面评价。同样由于热稳定性差异的影响,原油C29甾烷异构化参数在高熟阶段发生“倒转”,因此可利用甾烷异构化参数倒转的特征来判断原油的热演化阶段。而原油中重排甾烷/规则甾烷的值与成熟度具有较好的正相关性,可作为原油在成熟-高熟阶段有效的成熟度评价参数。 相似文献
5.
各类生物标志物的组成特征表明:柴达木盆地北缘的冷湖油田原油具有姥植比高（Pr/Ph>2.0）,重排甾烷（C27重排甾烷/规则甾烷=0.5~0.7）、重排藿烷（diaC30H/C30H=0.2~0.4）和新藿烷（C29Ts/C29H=0.4~0.7）含量中等,伽马蜡烷含量低（伽马蜡烷指数<0.05）的特征,它们源于该地区发育的下侏罗统淡水湖沼相烃源岩;而柴西北区咸水湖相原油的姥植比低（Pr/Ph<0.8）,重排甾烷（C27重排甾烷/规则甾烷<0.1）、重排藿烷（diaC30H/C30H<0.05）和新藿烷（C29Ts/C29H=0.2~0.4）含量低和伽马蜡烷含量高（伽马蜡烷指数=0.4~0.8）,这一系列特征与柴西地区发育的古近系-新近系咸水湖相烃源岩一致。但是,东坪地区原油呈现完全不同的生物标志物组合,主要表现为丰富的伽马蜡烷（伽马蜡烷指数=1.2~3.0）与高含量的新藿烷（C29Ts/C29H>1.5）、重排藿烷（diaC30H/C30H>0.7）和重排甾烷（C27重排甾烷/规则甾烷>0.4）并存,这与地质样品中伽马蜡烷和重排类标志物的分布特征相矛盾,因为依据现有的认识无法解释这一特殊地球化学现象。生物标志物组成特征表明东坪地区原油所具有的特殊生物标志物组合并非源于不同类型原油之间的混合,而是一种客观存在,尽管其确切的地球化学意义和形成条件目前并不清楚。由此可见,东坪地区原油为柴达木盆地一个新的原油类型,推测其烃源岩可能形成于偏酸性的咸水环境。 相似文献
6.
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
7.
塔中隆起原油特征与成因类型 总被引：21，自引：2，他引：19
塔里木盆地塔中隆起油气性质多样、分布与成因复杂, 为揭示油气的特征与成因, 对塔中及外围104个原油样品进行了精细地球化学研究.依据单体烃碳同位素、特征生物标志物分析, 将塔中原油分为4种类型: (1) 寒武系成因原油, 具有较重正构烷烃单体烃碳同位素(-29.6‰~-29.1‰)、甲藻甾烷较发育及C27、C28、C29规则甾烷呈反“L”型或线型分布等特征; (2) 中、上奥陶统成因原油, 具有较轻的正构烷烃单体烃同位素(-34‰~-35.6‰)、甲藻甾烷等不太发育与C27、C28、C29规则甾烷呈“V”型分布等特征; (3) 富含含硫芳烃-二苯并噻吩原油, 主要分布于塔中4井区; (4) 混源油, 单体烃碳同位素特征界于Ⅰ、Ⅱ类原油之间, 是塔中最为主要的原油类型.油-油对比与油气性质分析表明, 塔中地区至少有两套主力烃源岩供烃.塔中部分原油生物标志物显示寒武系-下奥陶统成因特征, 而单体烃碳同位素却与中上奥陶统成因原油更为接近, 这种不同馏分的不一致现象系不同成因原油混源的结果, 反映单一应用生物标志物指标有其局限性.塔中油气性质具有分带、分块、分层特征, 反映叠合盆地多源、多期成藏、储层非均质性等多种特性. 相似文献
8.
南堡凹陷油气源尚不清晰.首次采用单体烃碳同位素、结合生物标志物对全凹陷范围的原油和烃源岩进行了精细地球化学研究.分析表明, 拾场次洼沙三段烃源岩(Ⅰ类)发育高丰度的4-甲基甾烷与硫芴系列、贫伽玛蜡烷, 单体烃碳同位素为"斜直线型", 相关原油分布于高柳深层; 南堡凹陷南部沙二+三段源岩(Ⅱ类)伽玛蜡烷较发育, 但4-甲基甾烷不太发育, 其他特征类似于Ⅰ类源岩, 相关原油发现于潜山; 南堡凹陷沙一段-东三段烃源岩(Ⅲ类)富含重排甾烷与孕甾烷系列, 单体烃碳同位素较轻且近"W"型, 相关原油主要分布于南堡4、5号构造带.发现南堡油田1、2号构造带、老爷庙、高柳中浅层原油具有界于Ⅱ、Ⅲ类源岩(及相关原油)间的同位素与生标特征, 系混源油, 定量预测出混源油中沙二+三段源岩的贡献最高达82%.本研究关于Es2+3系南堡凹陷重要的油气源的认识不同于以往研究, 为该区进一步油气勘探提供了重要依据. 相似文献
9.
二连盆地宝勒根陶海凹陷虽然取得了很好的勘探成果,但油气成藏基础研究还非常薄弱。依据生物标志化合物特征对烃源岩进行分类,在此基础上开展油族划分和油源对比研究。地球化学特征表明,研究区有效烃源岩可划分为三类:第一类烃源岩为腾格尔组一段（K1bt1）中上部“高有机质丰度、低成熟度、高C27甾烷相对含量、高伽马蜡烷含量、低Pr/Ph比值”烃源岩;第二类烃源岩为K1bt1下部“高有机质丰度、中等成熟度、中等C27甾烷相对含量、中等伽马蜡烷含量”烃源岩;第三类烃源岩为阿尔善组（K1ba）“较高有机质丰度、较高成熟度、低C27甾烷相对含量、低伽马蜡烷含量、高Pr/Ph比值”烃源岩。依据生物标志化合物特征,油砂中的原油可划分成4个油族:油族1为K1bt1未熟油,原油来源于第一类烃源岩;油族2为K1bt1成熟油,原油来源于第二类烃源岩;油族3为K1bt1未熟油与K1bt1成熟油的混合油,原油来源于第一类烃源岩和第二类烃源岩;油族4为K1bt1成熟油与K1ba成熟油的混合油,原油来源于第二类烃源岩和第三类烃源岩。从油气来源预测有利区,K1bt1烃源岩所指向的有利区的面积为26.85 km2,K1ba烃源岩所指向的有利区面积为79.30 km2。 相似文献
10.
对塔里木盆地台盆区未遭受生物降解的138个原油样品进行甾、萜烷定量分析,展示原油甾、萜烷浓度随成熟度变化特征。C23三环萜烷/(C23三环萜烷+C30藿烷)值与甾、萜烷浓度图版显示各类甾、萜烷具有不同的热稳定性。依据热稳定性的差异将甾、萜烷分为3类:第1类包括Tm、C29藿烷和C30藿烷等五环三萜烷,随成熟度增高,这类化合物浓度降低较快,具有相对较低的热稳定性;第2类既包括Ts、C29Ts和C30重排藿烷等五环三萜烷,也包括C27和C29规则甾烷各异构体,随成熟度增高,这类化合物浓度降低较慢,具有中等热稳定性;第3类包括C27重排甾烷、C21甾烷和C23三环萜烷,随成熟度增高,这类化合物浓度先增高、后降低,降低速率低于前2类化合物,表明其热稳定性相对较高。在常用的甾、萜烷成熟度指标中,Ts/(Ts+Tm)、C29Ts/(C29Ts+C29藿烷)和C30重排藿烷/(C 相似文献
11.
Zhihuan Zhang Liming Qin Wei Li Chunjiang Wang Nansheng Qiu Xianlong Meng Zhenying Zhang Dongshan Yuan 《中国地球化学学报》2010,29(2):121-129
Geochemical composition characteristics of light oils from the Tertiary in the west of the Chepaizi uplift in the Junggar basin, northwest China, are distinct from those of biodegraded oils derived from the Permian in the study area and crude oils from some adjacent oil fields such as the Chepaizi and Xiaoguai oilfields. Oil source correlation shows that light oils in the study area have similar n-alkane and isoprenoid distribution patterns and carbon isotope compositions with the coal-derived oils from the Jurassic, and display obvious discrepancy on biomarker composition characteristics with the Cretaceous source rock extracts, inferring that they are probably the mixed oils from the Jurassic coal measures and Cretaceous source rocks. In this study, combined with the geochemical data of coal-derived oils from the Jurassic and Cretaceous source rocks or crude oils from the Cretaceous, the source and commingling features of the Tertiary crude oils of Well Pai 2 and Well Pai 8 were investigated. The proportion of the two sources in the mixed crude oils was estimated, and the hydrocarbon accumulation pattern of reservoirs in the study area was established. 相似文献
12.
1 Introduction Since the 1990’s of the 20th century, oil & gas geochemists have shifted their research focus on hydrocarbon source rocks in the past to that on reservoir rocks and oil reservoirs at present; their research field has been expanded from oil & gas exploration to the assessment of oil reservoirs and production & management. Therefore, reservoir geochemistry as a branch disciplinary of organic geochemistry is now attracting great concern of many oil & gas explorers and oilfield en… 相似文献
13.
The geochemical characteristics of crude oils from Zao-V oil measures in the Shen-jiapu oilfield are systematically described in terms of the fractional composition of crude oils, GC characteristics of saturated hydrocarbon fraction of crude oils and the characteristics of their bio-markers. The deposifional environment, type and evolution of the biological source are also discussed. All pieces of evidence such as low saturated hydrocarbon fraction, high resin and asphalt, high isoprenoid alkane, weak odd-carbon number predominance ( CPI ranging from 1.23 to 1,29, OEP ranging from 1.14 to 1.16) and low sterane and terpane maturity parameters show these crude oils are immature oils. Low Pr/Ph ratios (0.66 -0.88) and high gammacer-ante/C31 hopane ratios ( 0.59 - 0.86 ) indicate the source rocks were formed in a slightly saline to brackish reducing lake depositional environment. Gas chromatographic characteristics of the saturated hydrocarbon fraction and the predominance of C30 hopane in terpane series and C29 sterane in sterane series indicate the biological source of the crude oils is composed mainly of bacterial and algal organic matter, and some algae are perhaps the main contributor of organic matter to the source rocks. 相似文献
14.
乌兰花凹陷是二连盆地南部新发现的富油凹陷,对乌兰花凹陷原油物理性质和地球化学性质进行了系统的分析以揭示其特征及来源。原油物理性质显示,乌兰花凹陷原油比重（API gravity）介于20.2°~40.0°之间,主体为正常原油。原油生物标志化合物参数表明,不同构造带之间原油特征存在差异,可以划分为两类原油。一类以土牧尔构造带原油为主,具有低姥值比（Pr/Ph）和C21/C23三环萜烷,相对较高的伽马蜡烷/C31藿烷和规则甾烷/C30藿烷的特征,原油主要为烃源岩在成熟阶段早期的产物,主要以藻类来源为主。另一类原油包括赛乌苏和红井构造带原油,具有高姥值比（Pr/Ph）和C21/C23三环萜烷,相对较低的伽马蜡烷/C31藿烷和规则甾烷/C30藿烷,主要为陆源有机质和藻类有机质混合来源,原油具有更高的成熟度。原油碳同位素和正构烷烃单体烃碳同位素表明这两类原油应是一套烃源岩在不同成熟阶段的产物,原油主要来源于南洼槽阿尔善组烃源岩。阿尔善组烃源岩的非均质性和成熟度导致了两类原油的差异。 相似文献
15.
Well Zheng-1 is located in the combined area of the central uplift and the north Tianshan piedmont depression in the Junggar Basin. Two oil-bearing beds are recognized at 4788–4797 m of the Lower Cretaceous Tugulu Formation (K1tg) and 4808.5–4812.5 m of the Lower Jurassic Sangonghe Formation (J1s). The geochemical characteristics of family composition, carbon isotopic composition, saturated hydrocarbons, sterane and terpane biomarkers and carotane of two crude oils are described in this paper. The results show that the geochemical characteristics of the two crude oils are basically similar to each other, indicating they were all derived mainly from the high mature, brine, algae-rich lake facies sediments. Oil-source correlation revealed that crude oils of the two beds were derived mainly from the source rocks of Permian and mixed by the oil derived from the source rocks of Jurassic and Triassic. This is consistent with the geological background with several sets of source rocks in the area studied. 相似文献
16.
The geochemical characteristics of crude oils and reservoir core extracts from the Kuche petroleum system are described and studied systematically by means of various geochemical techniques and methods to acquire molecular information. The results suggest crude oils from the petroleum system can be divided into two groups: marine oils and non-marine oils. The former represents the dominant oils found in the area. Tar mats were firstly discovered and determined accurately in terrestrial oil and gas reservoirs, with Lower Tertiary sandstone reservoirs in the Yaha oilfield of the Tarim Basin. However, based on the ratio of 20S/(20S 20R)C29 sterane as a maturity parameter, lacustrine oils filled into the Tertiary reservoirs in the direction toward the western part of the petroleum system. In contrast, according to the fact that methylcyclohexane indices of eastern oils are greater than those of western oils, the location in which coalgenerated oils filled into the Tertiary reservoirs lies in the eastern part of the petroleum system. 相似文献
17.
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
18.
塔里木盆地塔东2井寒武系稠油地球化学特征与成藏 总被引：1，自引：0，他引：1
剖析塔东2井稠油的地球化学特征与形成过程,对深化塔里木盆地海相原油的成藏特征具有重要的意义。综合运用碳同位素、色谱、色谱—质谱等技术手段研究了塔东2井寒武系稠油的特征,研究结果揭示塔东2井寒武系稠油具高伽马蜡烷、高C28甾烷、低重排甾烷和高C27 三芳甾烷的特征,与寒武系—下奥陶统烃源岩的分子特征类似,说明塔东2井寒武系原油源自寒武系—下奥陶统烃源岩;塔东2井稠油中检出高丰度的稠环化合物（荧蒽、芘、苯并\[a\]蒽、屈、苯并荧蒽、苯并芘）,及全油的碳同位素值明显偏重,揭示了原油烃类经热蚀变发生稠化;流体包裹体均一化温度和埋藏—热演化史分析确定了塔东2井原油的成藏期为450~440 Ma。 相似文献
19.
Molecular fossils and sources of Cambrian heavy oil of Well Tadong-2 in the Tarim Basin,Xinjiang, China 总被引：1，自引：1，他引：0
Research on the molecular fossil characteristics of heavy oil from Well Tadong-2 is of great importance to constrain the source
of marine crude oils in the Tarim Basin, Xinjiang, China. The authors synthetically applied the isotope mass spectrograph,
chromatography and chromatography-mass spectrography to the studies of molecular fossil characteristics of heavy oil from
Well Tadong-2 in the Tarim Basin, and the results obtained revealed that heavy oil from Well Tadong-2 is characterized by
high gammacerane, high C28 sterane, low rearranged sterane and high C27-triaromatic steroid, these characteristics are similar to those of Cambrian-Lower Ordovician source rocks, demonstrating
that Cambrian crude oils came from Cambrian-Lower Ordovician source rocks; condensed compounds (fluoranthene, pyrene, benzo[a]anthracene,
bow, benzo fluoranthene, benzopyrene) of high abundance were detected in heavy oil from Well Tadong-2, and the carbon isotopic
values of whole oil are evidently heavy, all the above characteristics revealed that hydrocarbons in the crude oils became
densified in response to thermal alteration. 相似文献
20.
P.J. Grantham 《Organic Geochemistry》1986,9(6)
The extent of sterane isomerisation reactions and the moretane/hopane ratios of 234 crude oils, taken world wide, from a wide variety of source rocks of differing geological ages, have been measured.This data indicates that in 78 crude oils derived from Tertiary source rocks, sterane isomerisation reactions as determined by the 20S/(20S + 20R) ration of the C29 5α(H), 14α(H), 17α(H) normal-steranes and the C29 iso/(iso + normal) ratio [iso = 5α (H), 14β(H), 17β(H)] are mainly incomplete and sometimes considerably so. In addition, the same crude oils have 17β(H), 21α(H)-moretane/17α(H), 21β(H)-hopane ratios which are significantly greater (predominantly in the range 0.10–0.30) than those of crude oils derived from older, mature source rocks (mainly less than 0.1).This data, for crude oils, lends support to the hypothesis, proposed by Mackenzie and McKenzie (1983) for source rock extracts, that the time/temperature constraints of sterane isomerisation reactions are such that the time available for isomerisation in Tertiary sediments is generally insufficient, despite generation of crude oil at relatively high temperatures.An alternative hypothesis is that the incomplete sterane isomerisation of Tertiary crude oils may be due to generation of these crude oils from their deltaic, land plant-containing source rocks under low heating conditions.A third hypothesis proposes that the Tertiary crude oils may have picked up the incompletely isomerised steranes from immature sediments during migration. Although possible in particular instances, such a mechanism does not appear to be generally applicable since, in that case, the phenomenon would then appear to be restricted to the Tertiary.The higher moretane/hopane ratios of the Tertiary crude oils could suggest that constraints, similar to those applying in sterane isomerisation, also operate in the conversion of moretane to 17α(H)-hopane. 相似文献