CO_2脱沥青作用形成重油油藏的一个实例  

A Typical Case of Heavy Oil Pool with the Origin of CO_2 Deasphaltizing

作　　者：高金玉[1,2] 史卜庆 王林 窦立荣 程顶胜[3] 潘校华[3] 

机构地区：[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

出　　处：《现代地质》2009年第5期923-927,共5页Geoscience

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。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 between CO2 content 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 biogenetic CO2 could be derived from adjacent deep faults which penetrated lower crust or upper mantle.

关 键 词：脱沥青作用 二氧化碳气 溶解气 稠油油藏 苏丹 

分 类 号：TE122.2[石油与天然气工程—油气勘探]