鄂尔多斯盆地奥陶系碳酸盐岩脉流体包裹体碳氧同位素分析  

Carbon and oxygen isotope analysis of fluid inclusions in Ordovician carbonate veins of Ordos Basin

作　　者：刘德良[1] 孙先如[2] 李振生[1] 唐南安[3] 谈迎[1] 

机构地区：[1]中国科学技术大学地球与空间科学学院,安徽合肥230026 [2]安徽省地质实验研究所,安徽合肥230001 [3]中国地质科学院西安地质矿产研究所,陕西西安710054

出　　处：《石油学报》2007年第3期68-74,79,共8页Acta Petrolei Sinica

基　　金：国家自然科学基金(No40472074);国家重点基础研究发展规划项目(2001CB209133)资助

摘　　要：研究了鄂尔多斯盆地流体包裹体的CO2成因及其与油气演化的关系,应用同位素分馏方程计算了奥陶系碳酸盐岩脉流体包裹体中CO2的碳同位素值和H2O的氧同位素值。结果表明,其碳、氧同位素值分别为-1.64‰^-11.15‰和-22.12‰^-33.06‰。该包裹体的CO2以无机成因为主,其碳同位素组成形成于100℃~160℃的条件下,对应于油气演化的成熟—高成熟阶段。The origin of carbon dioxide in fluid inclusions and the evolution of oil and gas in Ordos Basin were studied. The values of carbon isotope of carbon dioxide and oxygen isotope of water in fluid inclusions of the Ordovician carbonate veins were calculated by the isotopic fractionation equation. The values of carbon isotope of carbon dioxide and oxygen isotope of water in fluid inclusions are minus 1.64‰ to minus 11.15‰ and minus 22. 12‰ to minus 33.06‰,respectively. The leading origin of carbon dioxide in fluid inclusions is inorganic. The carbon isotope composition of carbon dioxide was generated under homogenization temperature from 100℃ to 160℃ corresponding to the mature-to-high mature oil-gas evolution stage.

关 键 词：鄂尔多斯盆地 流体包裹体 油气演化 碳氧同位素 CO2成因 

分 类 号：TE122.2[石油与天然气工程—油气勘探]