摘要
通过对库车坳陷大宛齐油田第四系和上第三系康村组的油田溶解气组成在深度上的分布特征分析,认为大约在埋深450m以内的上部油层溶解气扩散作用强烈,不仅致使甲烷含量降低,乙烷、丙烷等组分百分含量相对升高,而且也降低了气油比,扩大了油藏的地饱压差。根据Fick第二扩散定律模拟计算油层的溶解气中甲烷浓度,从上新世中期到第四纪末期,油田上部的散失比例为54％,埋藏深度较大的下部油层的扩散作用较弱,散失比例为13％。图1表3参3（陈义才摘）
After analyzing the component of solution gas at different depth in Dawanqi oil field, in this paper, the authors consider that the diffusion of solution gas is remarkable in upper-oil layer in depth less than 450 meters. The diffusion not only leads to methane percent content decrease, ethane and propane etc percent content increase, but also reduces gas-oil ratio and enlarges pressure gap between formation pressure and saturation pressure of oil reservoir. According to simulation by Pick second diffusion law, the diffusion ratio of methane concentration in upper-oil layer solution gas is 54% from middle Pliocene to the end of Quaternary.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2002年第2期58-60,共3页
Petroleum Exploration and Development
基金
"九五"国家重点科技攻关专题(96-111-01-06-01)
