二氧化碳侵入前油气藏流体性质定量分析

发布时间：2018-06-08 13:34

本文选题：CO_ + 后期　；参考：《天然气地球科学》2017年03期

【摘要】：最近10年,在东南亚海域和南美东海岸发现一些高含CO_2的带有CO_2气顶的油环或底油油藏,对油气藏开发技术带来新的挑战。CO_2对原油中的中轻质组分的萃取作用显著,造成气顶气区以CO_2组分为主,底油或油环中的C_(7+)以上组分明显偏高,流体组成与分布特征既不同于传统的凝析气藏,又不同于混相驱油藏。基于油藏烃类取样样品组成,按照Kay混合法则、物质守恒原理及SpanWagner状态方程等建立了CO_2充注改造前油藏流体组成恢复方法,恢复出古油藏烃类流体组成与分布,应用油藏数值模拟方法模拟CO_2充注改造油藏过程,达到平衡后获取高含CO_2油气藏的流体组成与空间分布特征。应用该方法对某深水高含CO_2油藏流体组成和空间分布进行了预测,预测结果与油藏取样结果基本相符,表明该方法是可行的。
[Abstract]:In the last 10 years, some oil rings or bottom oil reservoirs with CO2 gas cap have been found in Southeast Asian waters and the east coast of South America. This has brought new challenges to the oil and gas reservoir development technology. As a result, CO-2 is the main component in gas cap gas area, and the above components in bottom oil or oil ring are obviously higher. The composition and distribution characteristics of fluid are not only different from the traditional condensate gas reservoir, but also different from the miscible flooding reservoir. Based on hydrocarbon sample composition of reservoir, according to Kay's mixing rule, material conservation principle and Span Wagner's equation of state, the recovery method of reservoir fluid composition before COSP _ 2 filling and revamping is established to restore the composition and distribution of hydrocarbon fluid in paleoreservoir. The reservoir simulation method is used to simulate the process of COSP _ 2 filling and reconstructing the reservoir, and the fluid composition and spatial distribution characteristics of the high CO-SHAL _ 2 reservoir are obtained after the reservoir is balanced. This method is used to predict the fluid composition and spatial distribution of a deep-water and high-CO-2bearing reservoir. The predicted results are in good agreement with the reservoir sampling results, which indicates that this method is feasible.
【作者单位】：中国石化勘探开发研究院;中国石油勘探开发研究院;
【基金】：国家科技重大专项“CO_2驱油与埋存潜力评价及战略规划”(编号:2011ZX05016)资助
【分类号】：TE311

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