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现代地质 ›› 2009, Vol. 23 ›› Issue (5): 923-927.

• 油气成藏 • 上一篇    下一篇

CO2脱沥青作用形成重油油藏的一个实例

 高金玉1,2, 史卜庆2, 王林2, 窦立荣2, 程顶胜3, 潘校华3   

  1. 1中国科学院 广州地球化学研究所,广东 广州510640;2中国石油天然气勘探开发公司, 北京100034;
    3中国石油勘探开发研究院,北京100083
  • 收稿日期:2009-04-01 修回日期:2009-09-10 出版日期:2009-10-20 发布日期:2012-02-16
  • 作者简介:高金玉,女,博士研究生,1966年出生,构造地质专业,主要从事石油勘探与开发工作。 Email: gaojy@cnpcint.com。

A Typical Case of Heavy Oil Pool with the Origin of CO2 Deasphaltizing

 GAO  Jin-Yu1,2, Shi Bu-Qiang2, WANG  Lin2, DOU  Li-Rong2, CHENG  Ding-Sheng3,Pan Xiao-Hua3   

  1. 1Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong510640, China;2China National Oil & Gas Exploration and Development Corporation, Beijing100034, China;3Research Institute of Petroleum Exploration & Development, PetroChina, Beijing100083, China
  • Received:2009-04-01 Revised:2009-09-10 Online:2009-10-20 Published:2012-02-16

摘要:

气体的脱沥青作用是引起油藏变稠或形成沥青垫的因素之一。对苏丹ME盆地某古近系稠油油藏的地质特征、原油物性、原油溶解气组分和地球化学特征进行分析,结果显示:原油普遍具有高沥青质、高含蜡、高凝固点、高酸值和低含硫的特点;原油溶解气中CO2含量的变化与原油API度具有正相关关系;含油包裹体中含有较多的CO2。结果表明气体溶解在原油中产生的脱沥青作用是引起该油藏密度变大的主要原因;而且气体主要是无机成因的CO2,来源于邻近油藏的沟通地幔的深断裂。

关键词: 脱沥青作用, 二氧化碳气, 溶解气, 稠油油藏, 苏丹

Abstract:

Gas deasphaltizing is one of the main factors to generate the asphalt mattress or to decrease oil API gravity in oil reservoir. Taking Palaeogene oil reservoir in ME basin of Sudan as an example, on the basis of analysis of the geologic characteristics of reservoir, physical properties and geochemical characteristics of crude oil, components of solution gas, this paper indicated the positive correlation betweenCO2content and API gravity of crude oil, and deduced that the lower API gravity of crude oil should be deasphaltized by CO2 washing or invasion, which was validated by Raman spectroscopy analysis of oilbearing inclusions;and the resource of biogeneticCO2could be derived from adjacent deep faults which penetrated lower crust or upper mantle.

Key words: gas deasphaltizing, carbon dioxide, solution gas, heavy oil pool, Sudan

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