混合原油的地球化学特征及成藏贡献率  

Geochemistry and Individual Contribution Ratio of Mixed Crude Oils

作　　者：常象春[1] 林玉祥[1] 郭海花[1] 庞凌云[1] 

机构地区：[1]山东科技大学地球信息科学与工程学院

出　　处：《地质科技情报》2007年第2期75-80,共6页Geological Science and Technology Information

基　　金：国家自然科学基金项目"叠合盆地混源体系中多套源岩及多期充注的成藏贡献率定量研究"(40502013)

摘　　要：含油气盆地中存在混合原油的现象非常普遍,按照形成条件可区分出4种不同的混合类型。地球化学研究表明不同有机相原油混合后体现各自母源的生物标志化合物组合特征;生物降解原油与正常原油混合后具有完整的饱和烃谱峰,同时还反映生物降解特点;不同成熟度的原油混合后既可检出热稳定性低的化合物,部分成熟度参数还可指示成熟特征;高成熟天然气与原油混合后,往往会使不同组分段的成熟度产生明显变化。特殊化合物绝对浓度定量法、生物标志化合物参数法、碳同位素法和拟合图版法是常见的定量成藏贡献率方法。针对混合原油地球化学识别和贡献率定量中的局限性,提出了利用指纹技术进行优化的思路。Mixed oils are widespread in oil-bearing basins. According to the forming conditions four different mixing patterns are classified. Geochemistry of mixed oils indicates that each mixing pattern is characterized by particularly distinguished indicators. When oils are generated from source rocks with different organic facies,biomarker assemblages of their mixture represent characteristics of both mixing sources. Oil mixed with biodegradation oil and normal oil bears continuous and whole chromatogram of saturate hydrocarbons as well as biodegradation performance. Several compounds developed in low mature can be detected in crude oils mixed by hydrocarbons with different maturity, while partial maturity parameters show higher maturity. Gases with high maturity charged into the oil reservoir will result in maturity variation among different components. Absolute concentration of special compounds, biomarker parameters,stable carbon isotope and conversion diagram are the common methods used for determining the individual contribution ratio in mixed oil. In order to overcome the localization in distinguishing mixed oils and partitioning the contribution ratio quantificationally,new technique of fingerprint is brought forward.

关 键 词：混合原油 生物标志化合物 地球化学 贡献率 指纹技术 

分 类 号：P618.13[天文地球—矿床学]