CAJ | 학술논문

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CO_2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CO_2.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CO_2,来源于邻近油藏的沟通地幔的深断裂.
기체적탈력청작용시인기유장변주혹형성력청점적인소지일.대소단ME분지모고근계주유유장적지질특정、원유물성、원유용해기조분화지구화학특정진행분석,결과현시:원유보편구유고력청질、고함사、고응고점、고산치화저함류적특점;원유용해기중CO_2함량적변화여원유API도구유정상관관계;함유포과체중함유교다적CO_2.결과표명기체용해재원유중산생적탈력청작용시인기해유장밀도변대적주요원인;이차기체주요시무궤성인적CO_2,래원우린근유장적구통지만적심단렬.
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 CO_2 content and API gravity of crude oil, and deduced that the lower API gravity of crude oil should be deasphaltized by CO_2 washing or invasion, which was validated by Raman spectroscopy analysis of oil-bearing inclusions;and the resource of biogenetic CO_2 could be derived from adjacent deep faults which penetrated lower crust or upper mantle.