共查询到20条相似文献，搜索用时 546 毫秒
1.
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
2.
An integrated petrological and geochemical analysis of surface and drilled oil sands was conducted to assess the organic matter origin/type, thermal maturity and paleoenvironment. Petrographic analysis of the oil sand used to establish the relationships between porosity and permeability with bulk density, RQI, NPI and FZI. The strong correlation between reservoir quality index (RQI) and permeability (R2 = 0.98) reveal that porosity has a good correlation to RQI. The biomarker signatures of the analyzed oil reveal predominance of subaquatic‐derived source input with mainly land plant materials. This was indicated based on the average concentration of αααC27:C28:C29 sterane 20R of about 38%, 22% and 40% respectively. This interpretation is also supported by high values of tricyclic terpane/αβC30 hopane and regular sterane/αβC30 hopane. An anoxic condition of deposition within a lacustrine paleoenvironment that attributed to the enhancement of the preservation of the organic matters in the area were indicated based on the low Pr/Ph ratios (average 0.74), low values of αβC31‐22R‐hopane/αβC30 hopane ratios and high C26/C25 tricyclic terpane ratios as well as the presence of gammacerane and a low water salinity. Biomarker maturity parameters show that the extracted oil sand has entered the early oil window stage. 相似文献
3.
Based on gas chromatography and gas chromatography mass spectrometry techniques, the authors examined biomarker characteristics of the Ganquan Formation source rocks in the area of Dahulishan, Ejina, and analyzed the information and petroleum geological significance that were indicated by the source of organic matter, sedimentary environment and maturity and so on. Gas chromatography peak of saturated hydrocarbons from the Ganquan Formation source rocks showed "the former peak" of the single peak distribution, the main peak of carbon being C18 , indicating the main sources of organic matter with marine organic matter. Pr/Ph ranges from 0.3 to 0.6, indicating a strongly reducing sedimentary environment. Biomarker assemblages of the Ganquan Formation source rocks are abundant in tricyclic terpane with long side chains, with a high level of gammacerane, showing dominant distribution of C27 sterane. High contents of gammacerane in organic matter show organic facies of source rocks in the saltwater sedimentary environment. That average hopane/sterane ratio is 0.59, showing that algae have made more contributions to organic matter than bacteria. And the high level of C27 steranes shows that algae are the main source of hydrocarbon precursors. The Ganquan Formation’s methylphenanthrene index, which is an effective molecular parameter index to measure thermal evolution of organic matter, ranges from 0.35 to 0.50, and the conversion of vitrinite reflectance Rc from it is within the range of 2.00-2.09, indicating that the Ganquan Formation source rocks are in the over-mature stage of thermal evolution. 相似文献
4.
卡塔克隆起中1井储层沥青地球化学特征与成因 总被引：1，自引：0，他引：1
塔里木盆地海相原油的成因至今仍有争议,而对储层沥青的地球化学特征剖析,能为探索海相原油的成因提供依据。选取卡塔克隆起上的中1井不同层系储层沥青,详尽剖析了其地球化学特征。研究结果揭示,中1井储层沥青的Pr/Ph为1.14～1.39,CPI值 1.01～1.08,OEP值0.98～1.05,无奇偶优势或偶奇优势,伽玛蜡烷、C28甾烷丰度低,硫芴系列丰富。甾烷成熟度参数和Ts/(Ts+Tm)均指示中1井储层沥青处于成熟—高成熟热演化范畴。依据特征生物标志物的分布对沥青的成因示踪,中1井储层沥青与上奥陶统烃源岩有成因关系,而中1井储层沥青与塔东2井寒武系原油分子特征的迥异也佐证该认识。 相似文献
5.
民和盆地中侏罗统煤-油页岩层系生油特征 总被引：4，自引：0，他引：4
本文简要论述了民和盆地中侏罗统含煤及油页岩层系的生油特征，探讨了盆地独特的石油地质和地球化学条件。原油主要地化特征为:Ｐｒ/Ｐｈ比值偏高（２.６５-３.１５）、甾烷/藿烷比值极低（０.０３）、Ｃ２７甾烷较丰富、Ｔｓ/Ｔｍ＞１低硫芴/氧芴比值、较高含量的Ｃ２９降新藿烷及重排藿烷类化合物及相对丰富的长链联苯及烷基四氢萘系列化合物。中侏罗统煤－泥页岩层系含生油潜力明显不同的多类型油页岩，多数油页岩属由藻类和陆生高等植物母质组成的混合型有机质，沉积环境为淡水－微咸水弱氧化条件，其地化特征也表现为高Ｐｒ/Ｐｈ比值（平均为１。９８），低甾烷/藿烷及低硫芴/氧芴比值等特征。某些油页岩富含Ｃ２９降新藿烷及重排藿烷系列化合物，它们应为主力源岩。油页岩多含再沉积型或沉积改造型有机质。异常地热作用对源岩演化及原油地化特征有重要影响。 相似文献
6.
S. Aboglila K. Grice K. Trinajstic D. Dawson K.H. Williford 《Organic Geochemistry》2010,41(12):1249-1258
Biomarker ratios, together with stable carbon (δ13C) and hydrogen (δD) isotopic compositions of individual hydrocarbons have been determined in a suite of crude oils (n = 24) from the East Sirte Basin to delineate their sources and respective thermal maturity. The crude oil samples are divided into two main families (A and B) based on differences in source inputs and thermal maturity. Using source specific parameters including pristane/phytane (Pr/Ph), hopane/sterane, dibenzothiophene/phenanthrene (DBT/P), Pr/n-C17 and Ph/n-Cl8 ratios and the distributions of tricyclic and tetracyclic terpanes, family B oils are ascribed a marine source rock deposited under sub-oxic conditions, while family A oils have a more terrigenous source affinity. This genetic classification is supported by the stable carbon isotopic compositions (δ13C) of the n-alkanes. Using biomarker maturity parameters such as the abundance of Pr and Ph relative to n-alkanes and the distribution of sterane and hopane isomers, family A oils are shown to be more thermally mature than family B oils. The contrasting maturity of the two families is supported by differences between the stable hydrogen isotopic compositions (δD) of Pr and Ph and the n-alkanes, as well as the δ13C values of n-alkanes in their respective oils. 相似文献
7.
发育于大陆边缘裂陷阶段以局限海相为主要沉积环境的富含浮游藻类泥页岩可能是Bonaparte盆地潜在的重要“油”源岩。从构造地质背景、沉积充填特征以及有机地球化学特征等多方面进行综合分析表明,局限海相页岩形成于大陆边缘裂陷阶段的衰减期,盆地基底的差异裂陷活动为页岩的形成提供了高可容纳空间和欠补偿的沉积环境,同时,“小隆大凹”的沉积格局更加有利于大规模相对稳定的半封闭的局限海沉积环境的形成和海相浮游藻类的繁盛。以扇三角洲和海底扇为主的物源体系带来大量“陆源”营养物质,同时,保持营养物质的供给与欠补偿条件的平衡。局限海相页岩主要形成于弱氧化、陆源物质供给较弱、局限海范围较大的沉积环境;岩性上以海相泥岩为主,陆源孢粉化石与沟鞭藻化石均较发育,或后者含量略高;沉积厚度适中、分布范围局限;有机质丰度相对较高,以混合型有机质为主,成熟度较低,气相色谱以前峰型为主,(nC21+nC22)/(nC28+nC29)和Pr/Ph比值相对较高,甾萜等生物标志化合物参数以低C19三环二萜和C24四环萜烷、高孕甾烷、高αααC27R/αααC29R为特征。 相似文献
8.
黔北务川-正安-道真地区铝土矿位于石炭系黄龙组和二叠系梁山组之间,主要属于沉积型铝土矿。通过气相色谱（GC）与气相色谱-质谱（GC-MS）手段分析铝土矿系钻孔岩心中的生物标志物,发现了含量丰富的正构烷烃、类异戊二烯烷烃、萜类化合物与甾类化合物。对10个样品饱和烃组分GC分析表明,正构烷烃主要呈双峰式分布特征,碳数分布n-C14～n-C35,CPI值范围为0.90～3.45,表现出奇偶优势。姥鲛烷/植烷（Pr/Ph）值为0.38～077,表现出明显植烷优势。对3个样品饱和烃组分GC-MS分析表明,萜烷类化合物以C30藿烷占优势,相对丰度由大到小依次为五环三萜烷、三环萜烷、四环萜烷,并检测出少量的γ-蜡烷。规则甾烷C27-C28-C29呈近L型或V型分布,并含少量4-甲基甾烷。根据生物标志物特征参数,结合岩心样品岩相学特征,确定了铝土矿系中有机质的陆上植物与低等菌藻类双重来源,铝土质沉积时为偏酸性较还原环境,明确了铝土矿系的形成过程受到来自陆上与沉积水体内两个古生态系统的双重作用。 相似文献
9.
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
10.
Q. Yuan 《Australian Journal of Earth Sciences》2018,65(5):727-738
The molecular composition of Carboniferous–Permian coals in the maturity range from 0.66 to 1.63% vitrinite reflectance has been analysed using organic geochemistry to investigate the factors influencing the biomarker compositions of humic coals. The Carboniferous–Permian coal has a variable organofacies and is mainly humic-prone. There is a significant difference in the distribution of saturated and aromatic hydrocarbons in these coals, which can be divided into three types. The Group A coals have biomarker compositions typical of humic coal, characterised by high Pr/Ph ratios, a lower abundance of tricyclic terpanes with a decreasing distribution from C19 tricyclic terpane to C24 tricyclic terpane and a high number of terrigenous-related biomarkers, such as C24 tetracyclic terpane and C29 steranes. The biomarker composition of Group B coals, which were deposited in a suboxic environment, have a higher abundance of rearranged hopanes than observed in Group A coals. In contrast, in Group C coals, the Pr/Ph ratio is less than 1.0, and the sterane and terpane distributions are very different from those in groups A and B. Group C coals generally have abnormally abundant tricyclic terpanes with a normal distribution maximising at the C23 peak; C27 steranes predominates in the m/z 217 mass fragmentograms. The relationships between biomarker compositions, thermal maturity, Pr/Ph ratios and depositional environments, indicate that the biomarker compositions of Carboniferous–Permian coals in Ordos Basin are mainly related to their depositional environment. This leads to the conclusion that the biomarker compositions of groups A and B coals collected from Shanxi and Taiyuan formations in the northern Ordos Basin are mainly related to their marine–terrigenous transitional environment, whereas the biomarker compositions for the Group C coals from Carboniferous strata and Shanxi Formation in the eastern Ordos Basin are associated with marine incursions. 相似文献
11.
我国凝析油的成因类型及其地球化学特征和意义 总被引：5，自引：1，他引：5
近十几年的勘探实际表明，在我国一些含油气盆地中，许多天然气藏均伴生一定量的凝析油（或轻质油）。按母质类型可将凝析油分为海相腐泥型有机质生成的凝析油、煤系地层腐殖质有机质生成的凝析油、陆相混合型有机质生成的凝析油。本文较详细地从成因机理上讨论了这三种不同成因凝析油的形成特点。海相腐泥型有机质一般在有机质热演化达到高成熟－过成熟阶段，由干酪根或早期形成的高分子液态烃热裂解才形成凝析油。煤系地层中腐殖型有机质从低成熟到过成熟各个阶段所生成的一定量的液态烃一般主要以凝析油的状态与天然气相伴生。陆相混合型有机质从低成熟到过成熟阶段也都可能形成凝析油。利用凝析油单体烃的组份特征，石蜡指数和庚烷值对我国主要含油气盆地凝析油的成熟度进行了计算，所得结果，大都与地质实际相吻合。研究表明我国凝析油成熟度的分布范围从低成熟到过成熟均有。三种不同成因的凝析油其地球化学特征具有一定差异，煤系地层腐殖型有机质形成的凝析油从组份来讲相对富含芳烃，其芳烃含量一般为１６.２～２３.５%，饱和烃/芳烃值为３.２～５.２，同时其姥鲛烷/植烷值相对较高，通常均大于３；而海相腐泥型有机质生成的凝析油则相对富含饱和烃，其饱/芳比值为１１.８～１８.２，同时姥蛟烷/植烷值较低，一般小于1。陆相混合型有机质生成的凝析油则介于二者之间。三类不同成因的凝析油它们的芳烃组份(蔡系、联苯系和药系)和低分子生物标记物(菇类化合物)以及烷烃和芳烃组份的碳同位素组成都具有明显的差异。利用凝析油的这些地球化学特征可以有效地判识凝析油的成熟度和成因类型，从而确定与之相伴生的天然气的成因或来源。 相似文献
12.
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
13.
琼东南盆地深水东区勘探程度低,钻井样品受油基泥浆污染严重,目前关于该区浅海相和海陆过渡相烃源岩的有机地球化学研究较为局限。通过对深水东区渐新统受油基泥浆污染的泥岩岩屑进行有效地洗油实验及有机地球化学分析测试,结合东部浅水区渐新统烃源岩样品的有机岩石学、有机地球化学分析测试等地质资料,系统剖析了深水东区渐新统不同沉积相烃源岩的地球化学特征、发育控制因素和发育模式。研究结果认为,琼东南盆地深水东区渐新统烃源岩的发育模式可分为海陆过渡相三角洲前缘模式和浅海相模式。海陆过渡相三角洲前缘烃源岩为中等—高有机质丰度,有机质类型为Ⅲ型,具有Pr/Ph普遍大于3、(nC21+nC22/nC28+nC29)普遍小于1.2、高OL/C30H、高T/C30H、低C23TT/C30H、低C27ST/C29ST和相对较低的Ga/C30H、C35/C3422S的特征,烃源岩的TOC和硫含量相关性极好,沉积水体为氧化性淡水—半咸水环境。三角洲前缘烃源岩的TOC和母源输入参数相关关系较好,而与Ga/C30H、C35/C3422S参数相关关系较差,说明三角洲前缘烃源岩的有机质丰度主要受陆源有机质输入的控制。浅海相烃源岩有机质丰度中等,有机质类型为Ⅱ2~Ⅲ型,具有Pr/Ph普遍小于3、(nC21+nC22/nC28+nC29)普遍大于1.5、低OL/C30H、低T/C30H、高C23TT/C30H、高C27ST/C29ST和相对较高的Ga/C30H、C35/C3422S的特征,且烃源岩的TOC和硫含量相关性较差,沉积水体为弱氧化性半咸水—咸水沉积环境。浅海相烃源岩的TOC和母源输入参数、Ga/C30H、C35/C3422S等相关关系均较好,说明浅海相烃源岩有机质丰度受水生有机质输入和弱氧化性半咸水—咸水沉积环境控制。滨海相烃源岩的有机质丰度为差—中等,有机质类型以Ⅲ型为主,且TOC受母质来源或沉积水体的氧化还原性影响较小,其烃源岩发育模式是一种破坏性模式。 相似文献
14.
通过采集鄂尔多斯盆地西南缘4个剖面奥陶系马家沟群碳酸盐岩和平凉组泥页岩样品,对其中可溶有机质饱和烃与芳烃组分进行GC-MS分析,对比研究了马家沟群碳酸盐岩和平凉组泥页岩生物标志化合物特征。结果表明,马家沟群与平凉组正构烷烃分布形式及峰型特征、生物标志化合物参数Pr/Ph、伽马蜡烷/C30-αβ藿烷、C20-29三环萜烷/(C20-29三环萜烷+C27-35藿烷),以及甲基菲指数(MPI)均存在明显差异,这些差异反映了其沉积环境与成熟度的不同,对于马家沟群与平凉组来源油的识别具有参考价值。马家沟群正构烷烃分布形式与甾/藿比值以及C28/C29ααα20R甾烷比值之间的对应关系,反映了母质输入的细微差别。Ts/(Ts+Tm)与伽马蜡烷/C30-αβ藿烷比值之间的关系,C29甾烷αββ/(αββ+ααα)比值变化与重排藿烷与重排甾烷丰度的关系,反映上述成熟度参数明显受沉积环境影响。 相似文献
15.
应用气相色谱、气相色谱-质谱技术,研究了秀水盆地秀D1井下白垩统义县组烃源岩的生物标志化合物特征,对烃源岩有机质来源、沉积环境、热演化程度等进行了分析.结果表明,秀水盆地秀D1井下白垩统义县组烃源岩有机质丰度高,有机质类型为Ⅱ型,处于成熟演化阶段;（C20+C21）/（C23+C24）三环萜烷为0.66~5.06,C24四环萜烷/C26三环萜烷为0.38~2.25,具有典型湖相烃源岩特征;烃源岩Pr/Ph主要介于0.5~1.0之间,指示还原环境;伽马蜡烷/C30藿烷比值为0.05~0.41之间,指示处于强还原性沉积环境,并且烃源岩沉积时水体的盐度较低以及可能存在水体盐度分层;Pr/nC17、Ph/nC18关系表明有机质类型主要为Ⅱ1型,C27-C28-C29甾烷的相互关系反映有机质来源应为低等水生生物和陆生高等植物的混合来源;Ts/Tm比值为0.45~1.82,C31αβ22S/（22S+22R）比值为0.41~0.62,表明烃源岩处于低成熟-成熟演化阶段,并且具有义县组中、下部烃源岩成熟度较义县组上部高的特点.综合认为秀水盆地早白垩世义县组烃源岩形成于水体盐度较低的还原-强还原环境,有机质来源为混合来源,有利于有机质的富集,义县组具有较好的油气勘探前景. 相似文献
16.
Md. Farhaduzzaman Wan Hasiah Abdullah Md. Aminul Islam 《Journal of the Geological Society of India》2014,83(4):433-446
Surma Group is the most important geological unit of Bengal basin, Bangladesh, because petroleum resources occur within this group. It is mainly composed of alternation of shale and sandstone and the shale fraction has long been considered as source rocks and the sandstone fraction as reservoir. These source and reservoir rocks have been studied by different authors by different approach but none of them adopted organic geochemistry and organic petrology as a means of study of source rock and their possible depositional environment. A total of thirty shale core samples have been collected from eight different gas fields to fulfill the short coming. The collected samples have been subjected to Source Rock Analysis (SRA) and/or Rock-Eval (RE) followed by pyrolysis gas chromatography (PyGC), gas chromatography mass spectrometry (GCMS), elemental analysis (EA) and organic petrological study such as vitrinite reflectance measurement and maceral analysis. The analyzed organic matter extracted from the shales of Surma Group consists mainly of Type III along with some Type II kerogen. The studied shales are mostly organically lean (TOC ±1%) and the extracted organic matter is fair to moderate. Based on these results, the analyzed shales have been ranked as poor (mostly) to fair quality source rock. The organic matter of the analyzed shale samples is thermally immature to early mature for hydrocarbon generation considering their Tmax and measured mean vitrinite reflectance values. The hopane 22S/(22S + 22R), moretane/hopane ratio and sterane parameters are also in good agreement with these thermal maturity assessments. The predominance of odd carbons over even carbons (most common) and/or even carbons over odd carbon numbered n-alkanes, moderate Pr/Ph ratio, low to high Tm/Ts ratio, comparative abundance of sterane C29 (i.e., C29 >C27>C28), Pr/nC17 — Ph/nC18 values, C/S ratio and dominance of vitrinite macerals group with the presence of liptinite macerals demonstrate that the organic matter has derived mainly from terrestrial inputs with an insignificant contribution from the marine sources. The condition of deposition alternates from oxic to anoxic. 相似文献
17.
煤成油生成和运移的模拟实验研究 Ⅲ．甾、萜标记物特征及其意义 总被引：1，自引：0，他引：1
在对两个褐煤样品进行同时考虑生烃和排烃模拟实验的基础上，本文对其甾、萜标记物的组成、分布和演化进行了研究，探讨了其生源意义、成熟演化及与自然演化的异同和甾、萜参数作为运移指标的意义。 相似文献
18.
通过对正构烷烃、类异戊二烯烷烃、萜烷、甾烷等生物标志化合物的研究,对额济纳旗及其邻区二叠系埋汗哈达组的沉积环境、烃源岩干酪根类型、成熟度等进行了评价。烃源岩Pr/Ph绝大部分小于1,显示植烷优势,表明研究区二叠系埋汗哈达组沉积环境为还原—强还原环境,有利于有机质的富集,物源来自于陆源高等植物和水生生物,且以水生生物输入占优势;利用Pr/nC17-Ph/nC18、C27-C28-C29甾烷等生物标志化合物的关系评价区内埋汗哈达组烃源岩有机质类型以Ⅱ2型为主;对OEP、萜烷、C29甾烷等参数分析表明,额济纳旗及其邻区二叠系埋汗哈达组烃源岩处于成熟—高成熟阶段,有利于油气的生成。 相似文献
19.
Distinctive compositional features of cyclic saturated hydrocarbon biomarkers have been established in oils from the main petroliferous lithostratigraphic complexes of various structural zones in the Timan-Pechora petroliferous province (TPPP). Four geochemical families (types) of oils in TPPP are recognized based on the variations in the geochemical parameters of steranes and terpanes including sterane ratios C27/C29 and C28/C29, K1 mat and K2 mat, diasterane/regular sterane, pregnane (C21–22)/sterane (C21–22 + C27–29), as well as terpane Ts/Tm parameters, adiantane C29/hopane C30, neoadiantane/adiantane, tryciclic terpane/pentacyclic terpane, hopane/sum of C29 steranes, etc. The distribution of various types of oil in the sedimentary sequence of TPPP makes it possible to infer source rocks for each of the four selected types. 相似文献
20.
高温高压条件下铁岭灰岩晶包有机质的饱和烃演化特征 总被引：8，自引：2，他引：6
对铁岭灰岩抽提除去沥青“Ａ”后的残渣进行高温高压模拟实验,模拟实验研究表明,晶包有机质的释放与温度与温度和压力有关,高压有利于晶包有机质释放。晶包有机质和干酪根主要释放出低碳数烷烃,Ｐｒ／ｎＣ１７、Ｐｈ－ｎＣ１８在热演化过程中变化不大,Ｐｒ／Ｐｈ则波动较大。 相似文献