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我国不同类型的古湖盆广布和发育,湖盆中生油岩最早形成于晚二叠世,中生代以来直至早第三纪占有主导地位,它为我国油气田的形成奠定了良好的基础。 相似文献
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江苏句容盆地继下青龙组(T1x)碳酸盐岩产层中发现自生自储的低—中等成熟度原油之后,又在上覆上青龙组(T1s)见到未成熟的碳酸盐生油岩。这种在地质时代相对较老的早三叠世中见到未成熟碳酸盐生油岩的情况,国内尚属首次发现,值得引起重视。本文主要应用烃类组成、岩石热解色谱、烷烃气相色谱、干酪根红外吸收光谱和镜质体反射率等分析成果,对未成熟碳酸盐生油岩的地球化学特征及其地质成因进行探讨。 相似文献
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尚慧芸 《石油与天然气地质》1986,(3):236-240
由于原始母质中含有陆源高等植物成分,陆相原油和生油岩抽提物所含生物标记物与海相原油、生油岩有所不同。陆相特征生物标记物有高碳数正构烷、某些三环二萜烷、伽马烷、奥利烷、镍卟啉、苝等等。 相似文献
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西班牙近海卡萨布兰卡油田中部中新统艾卡纳组是在海进条件下形成的一套碳酸盐岩生油岩。其碳酸盐含量占32~80%,平均为61%;有机碳含量为0.5~4.73%,平均值为2.9%,为良好的油气源岩。化学分析结果表明,艾卡纳组生油岩中较高的碳酸盐含量对有机质的保存不太有利,同时,那些有机质类型较好的生油岩其碳酸盐含量并不是最高的。但产率指数与碳酸盐含量之间的正相关分布关系似乎弥补了由于碳酸盐含量的增加而造成的有机碳含量下降和有机质类型劣化的不足。此外,研究表明,要使不同类型的有机质达到几乎相同的热成熟度,富氢型有机质往往比贫氢型有机质需要更高的温度。 相似文献
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陆相原油及生油岩中的奥利烷及其地质意义 总被引:2,自引:0,他引:2
原油及沉积岩抽提物中的奥利烷、属五环三萜烷藿烷系列,在m/e191质量色谱图上C30峰的左肩有明显的峰,为C30H52藿烷的同分异构体之一,是石油地球化学中一个重要的生物标记化合物。通过对我国陆相沉积盆地样品分析研究,发现并非所有的陆相原油及生油岩中均含有奥利烷,而是在特定的地质条件下,一般为沼泽相、三角洲相、浅湖相或含煤系地层中,它的出现是与高等植物有关的腐殖型母质有成因联系,而在半深-深水湖相含腐泥型为主的生油岩中,没有发现奥利烷。 相似文献
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ORGANIC GEOCHEMISTRY AND SOURCE ROCK CHARACTERISTICS OF THE ZAGROS PETROLEUM PROVINCE, SOUTHWEST IRAN 总被引:1,自引:1,他引:1
The Zagros of SW Iran and its continuation into N Iraq forms the tectonised NE margin of the Middle East basin. Sedimentation in the Zagros began in the late Precambrian and continued with comparatively few interruptions until the Pliocene, when strong earth movements affected the area and gave rise to the present day large. elongated NW-SE trending structures. Some of the world's largest structurally-controlled oil fields are located in the Zagros. The most productive pay zone is the Oligo-Miocene Asmari Formation, although significant oil pools are present also in the Cenomanian-Turonian Sarvak limestone and in the Neocomian-Jurassic Khami Group carbonates. Recently, large gas deposits have been discovered in the Permo-Triassic carbonates assigned to the Deh Ram Group. Geochemical studies were carried out five potential source beds of Eocene-Palaeocene (Pabdeh Formation). Coniacian-Neocomian (Garau Formation) and Silurian (Ghakum Formation) age. The results showed that the organic matter in these formations is almost exclusively of marine algal origin, and that the Kazhdumi is the major source of the hydrocarbons in the Asmari and Sarvak reservoirs. The origin of the hydrocarbons in the Khami and Deh Ram reservoirs is at present speculative. 相似文献
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煤和陆源有机质生油岩有机岩石学特点及评价 总被引:2,自引:0,他引:2
煤和陆源有机质生油岩与海相、湖相腐泥型生油岩组成了地质体中的三大类型生油岩。其特点是:生油岩中有机质以高等植物占绝对优势,以Ⅲ型干酪根为主;有机质由生油富氢组分(包括壳质组分、腐泥组分和超微类脂体)和不生油贫氢组分组成。前者的数量决定着这种生油岩的生油潜力。由于煤和陆源有机质烃源岩在组成和结构上的复杂性,必须采取以荧光显微镜为主,并结合反光、透射电子显微镜分析技术,进行分层次(深入到显微组分、亚显微组分、微显微组分)的研究,才能准确评价此类生油岩。新疆侏罗系煤系烃源岩富氢组分中以镜质组(其中含有一定数量的超微类脂体)占绝对优势,暗色泥岩中相对富含类脂体组分,其生油潜力不容忽视。 相似文献
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CRUDE OIL GEOCHEMISTRY AND SOURCE ROCK POTENTIAL OF THE UPPER CRETACEOUS – EOCENE SUCCESSION IN THE BELAYIM OILFIELDS,CENTRAL GULF OF SUEZ,EGYPT 下载免费PDF全文
W. Sh. El Diasty S. Y. El Beialy A. R. Mostafa A. A. Abo Ghonaim K. E. Peters 《Journal of Petroleum Geology》2015,38(2):193-215
This study evaluates the petroleum potential of source rocks in the pre‐rift Upper Cretaceous – Eocene succession at the Belayim oilfields in the central Gulf of Suez Basin. Organic geochemical and palynofacies investigations were carried out on 65 cuttings samples collected from the Thebes, Brown Limestone and Matulla Formations. Analytical methods included Rock‐Eval pyrolysis, Liquid Chromatography, Gas Chromatography and Gas Chromatography – Mass Spectrometry. Four crude oil samples from producing wells were characterised using C7 light hydrocarbons, stable carbon isotopes and biomarker characteristics. The results showed that the studied source rocks are composed of marine carbonates with organic matter dominated by algae and bacteria with minimal terrigenous input, deposited under reducing conditions. This conclusion was supported by n‐alkane distributions, pristane/ phytane ratios, homohopane and gammacerane indices, high concentrations of cholestane, the presence of C30 n‐propylcholestanes, and low diasterane ratios. The source rocks ranged from immature to marginally mature based on the Rock‐Eval Tmax together with biomarker maturity parameters. The analysed crude oil samples are interpreted to have been derived from source rock intervals within the Eocene Thebes Formation and the Upper Cretaceous Brown Limestone. The similarity in the geochemical characteristics of the crude oils suggests that there was little variation in the organofacies of the source rocks from which they were derived. 相似文献
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王府凹陷油源与原油地球化学特征 总被引:1,自引:1,他引:1
王府凹陷青一段泥岩为最好生油岩;青二、三段为较差生油岩。与朝阳沟原油和三肇凹陷原油相比,本区原油具有低芳烃、低Pr/Ph、高(C_(21)+C_(22))/(C_(28)+C_(29)),碳同位素偏轻。生物标志物成熟度参数C_(29)甾烷(20S)/(20S+20R)为0.51~0.54。油源对比认为原油来自本区青一段泥岩,原油在凹陷内可以从中心向边部作长距离运移。 相似文献