摘要
为查明古油藏原油的成因,对羌塘盆地双湖地区侏罗系布曲组含油白云岩、含沥青石灰岩的饱和烃气相色谱和萜烷、甾烷生物标志化合物特征进行了分析,并利用GC-C-MS技术对含油白云岩、含沥青石灰岩、石灰岩中正构烷烃单体碳同位素的组成特征和分布形式进行了研究。测试结果显示,Pr/Ph值为0.37～2.07,Pr/nC17值为0.14～0.76,说明油气源岩沉积环境以浅海陆棚开放性水域为主;OEP值为0.96～1.17,奇碳优势不明显,显示了成熟—高成熟阶段的基本特征;原始有机母质构成中既有较高比例的高等植物,又有一定比例的低等水生生物混入。原油与烃源岩δ13C值分布形态具有相似的特征,正构烷烃单体碳同位素都表现为δ13C值从低碳数到高碳数降低的趋势,反映了原油来自海相沉积地层,它们具有同源的有机质母源。
In order to ascertain the oil origin of paleo-reservoir of Shuanghu region.Qiangtang Basin,the oil-bearing dolomite and bituminous limestone of Buqu formation of Jurassic were analyzed in terms of gas chromatography and biomarkers of p-menlhane and ster ane.And the composition and distribution form of carbon isotope-pi individual n-alkanes derived from dolomite reservoirs,bitumi-nous limestones and normal limestones were studied by means of GC-C-MS techniques.The test results,Pr/Ph of 0.37-2.07 and Pr/nC17 of 0.14-0.76,are indicative of opening shallow shelf environment for most of the source rock with OEP 0? 96-1.17.and low odd-carbon dominance,which is the representative of mature and high-mature stage.and high percentage of higher plant with certain lower aquatic organism in the original organic matrix.The distribution pattern of S'C of the source rock is similar with the oil with a decreasing trend of individual 8'C value of n-alkanes from low carbon number to high carbon number,which is the representative of the marine origin.the same origin of organic source.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第1期22-24,36,共4页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目"青藏高原北部第三纪沉积体制转型与构造及气候变化耦合过程的研究"(40572077)
关键词
含油白云岩
油源对比
正构烷烃
单体碳同位素
有机地化特征
羌塘盆地
oil-bearing dolomite
oil-source rock correlation:carbon isotope of individual n-alkanes
organic geochemistry feature
Qingtang Basin
