天然气富集的相态转变条件及对成藏的贡献  

PHASE CHANGE CONDITIONS OF GAS ENRICHMENT AND THEIR CONTRIBUTION TO RESERVOIR FORMING

作　　者：付广[1] 李颖[1] 石娜[2] 

机构地区：[1]大庆石油学院地球科学学院,黑龙江大庆163318 [2]大庆油田有限责任公司第四采油厂,黑龙江大庆163511

出　　处：《大庆石油地质与开发》2009年第1期1-5,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家“973”重点基础研究项目（2001CB209104）资助.

摘　　要：天然气二次运移的初始相态由于受到源岩有机质类型和演化程度的影响，不同类型的有机质在不同演化阶段排出的天然气相态不同且会发生相态的相互转换，其中水溶相、油溶相和扩散相向游离相的转变才有利于天然气的富集成藏。水溶相和油溶相天然气向游离相天然气转变需要埋深变浅、温度和压力降低，而扩散相天然气向游离相天然气转变则需要遇到浓度盖层或气藏，由此研究了水溶相、油溶相和扩散相天然气向游离相天然气转变及对成藏贡献量的方法，并对水溶相、油溶相和扩散相天然气向游离相天然气转变量对成藏贡献进行了研究。结果表明，水溶相、油溶相和扩散相向游离相转变的天然气均可成为天然气富集成藏的重要组成部分。Initial phase of secondary migration of natural gas is influenced by type and evolution degree of organic matter of source rock. Different types of organic matter discharge different phases of gas in different evolution stages and can be transformed. Among these phases, only transformation from water-soluble phase, oil-soluble phase and diffusive phase to free phase can be favorable for enrichment and gas reservoir forming. The former two phases transformation requires shallow buried depth, low temperature and low pressure, while the latter needs gas-enriched caprock or gas reservoir. This paper studies the above transformation from water-soluble phase, oil-soluble phase and diffusive phase to free gas and its contribution magnitude to reservoir forming, and studies transformation magnitude from water-soluble phase, oil-soluble phase and diffusive phase to free gas and its contribution to reservoir forming. Results show that natural gas transformed from water-soluble phase, oil-soluble phase and diffusive phase can all become the important component of enrichment and formation of gas reservoir.

关 键 词：天然气 水溶相 油溶相 扩散相 游离相 相变 

分 类 号：TE121[石油与天然气工程—油气勘探]