黔中隆起及周缘地区下组合含油气流体包裹体研究  

A study of hydrocarbon fluid inclusions in Qianzhong uplift and its adjacent areas

作　　者：冯常茂[1] 牛新生[1] 吴冲龙[1] 

机构地区：[1]中国地质大学,湖北武汉430074

出　　处：《岩石矿物学杂志》2008年第2期121-126,共6页Acta Petrologica et Mineralogica

基　　金：国家十五科技攻关项目(2004BA616A-06-01)

摘　　要：应用均一法测温及激光拉曼探针等技术对黔中隆起地区下组合含油气流体包裹体进行了研究，结果表明该区烃类包裹体个体较小，无色，形态不规则，其烃类成分以CH4为主，具明显干气特征，部分包裹体内含CO2，分析认为是碳酸盐（碳酸氢钙）因温度、压力的变化分解所致。均一温度测试结果显示下组合油气包裹体形成时的温度分别位于85～12513、12516513两个温度段，结合该地区埋藏史及古地温史研究，确定本区成藏期分别为早中寒武世一早三叠世及早三叠世一中晚侏罗世。By means of thermometry and Raman spectrum technology, this paper has studied characteristics of fluid inclusions of marine lower assemblage in Qianzhong uplift area. The result indicates that the fluid inclusions are characterized by small size, colorlessness and irregular shape, whereas the nature gas is a dry gas mainly composed of CH4. Some CO2-bearing inclusions were formed by carbonate [ Ca（HCO3）2 ] decomposition under the condition of temperature and pressure change. The homogenization temperature of inclusions in marine lower assemblage has two temperature ranges, which are 85-- 125℃ and 125-- 165℃, respectively. It is thus concluded that the hydrocarbon accumulation periods of this area are Early-Middle Cambrian- Early Triassic and Early Triassic - Middle-Late Jurassic.

关 键 词：流体包裹体 激光拉曼光谱 成藏期 黔中隆起 

分 类 号：P618.13[天文地球—矿床学] P59[天文地球—地质学]