新疆石油地质

新疆石油地质 ›› 2007, Vol. 28 ›› Issue (3): 320-323.

• 油气勘探 • 上一篇    下一篇

东营凹陷南斜坡东段原油的地球化学特征

王建伟1, 宋书君1, 李向博1, 刘金友1, 高侠2   

  1. 1.中国石化 胜利油田有限责任公司 现河采油厂地质所, 山东 东营 257068;
    2.中国石油大学 资源与信息学院, 山东 东营 257062
  • 收稿日期:2006-08-23 修回日期:2006-11-10 出版日期:2007-06-01 发布日期:2020-07-31
  • 作者简介:王建伟(1975-), 男, 河北承德人, 副研究员,石油地质,(Tel) 13371503956(E-mail) wjwei@slof.com
  • 基金资助:
    山东省博士后择优项目, 东营凹陷南斜坡东段古近系油气优势输导体系研究(20063027)资助

Geochemical Characteristic of Crude Oil in Eastern Part of South Slope of Dongying Sag

WANG Jian-wei1, SONG Shu-jun1, LI Xiang-bo1, LIU Jin-you1, GAO Xia2   

  1. 1. Xianhe Production Plant, Shengli Oilfield Company Ltd., Sinopec, Dongying, Shandong 257068, China;
    2. Faculty of Natural Resources and Information Technology, China University of Petroleum, Dongying, Shandong 257062, China
  • Received:2006-08-23 Revised:2006-11-10 Online:2007-06-01 Published:2020-07-31

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摘要： 东营凹陷南斜坡东段古近系原油具有“多源和远源”的复杂油源条件,原油成因分类成为该区油气地质研究中的一个难点。通过系统分析45处样点共61个原油及岩石氯仿抽提物的生物标志化合物构成特征,对该区原油进行了成因分类和油源判别。该区存在着3种成因类型原油。Ⅰ类原油具有m(Pr)/m(Ph)比值低、甾类化合物异构化程度低和伽马蜡烷相对含量高的特征,反映出Ⅰ类原油可能主要来自沙四上亚段生油岩;Ⅱ类原油的m(Pr)/m(Ph)比值高,甾类化合物异构化程度高和伽马蜡烷相对含量低,表明原油可能主要来自沙三下亚段生油岩;Ⅲ类原油的m(Pr)/m(Ph)比值较高,甾类化合物异构化程度较低,伽马蜡烷相对含量极高,并且相对富含三环萜烷和C29规则甾烷,而δ13C值明显偏轻,表明该区可能存在一套尚未落实的生油岩。多种成因类型原油的存在表明,断陷盆地缓坡带油源多样、油气运移和聚集过程复杂,该类构造单元仍存在很大油气勘探潜力。

关键词: 东营凹陷, 原油, 地球化学特征, 成因

Abstract: The petroleum exploration indicates the complexity of the oil sources and origins of Palaeogene in eastern part, south slope of Dongying sag. The crude oil is characterized by the multi-source and the far-source in this area. The genetic classification and source identification are based on 61 oil and oil-bearing rock samples from different 45 points. The results show that there are three classes of crude oils in origin. Class-I oil is characterized by low m(Pr)/m(Ph) raito, low maturity and high gammacerane index, reflecting the oil may come from the Es4s source rock; Class-Ⅱoil by high m (Pr)/m (Ph) ratio, high maturity and low gammacerane index, showing it may derive from the Es3x source rock, while Class-Ⅲ oil by relatively high m(Pr)/m(Ph) ratio, relatively low maturity and extremely high gammacerane index, with high content of tricylic terpane and C29-αααsterane as well as little lighter of δ13C value, indicating that there existed a set of source rocks to be recognized here. The study shows that the multi-origin types of crude oil mean that in the ramp of this fault basin, there are multiple oil sources and complex processes of oil-gas migration and accumulation as well as much more oil potentials to be explored in the slope of Dongying sag.

Key words: Dongying sag, crude oil, geochemistry, origin

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