Research on Immature Olls in the Jizhong Depression and Its Exploration Prospect
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摘要: 冀中坳陷的晋县凹陷中,北部 Es4-Ek1段盐湖相未成熟阶段含膏烃源岩中的可溶有机质所形成的原油属未熟油,如赵兰庄、赵县油田等。这种未熟油具有高密度(0.98~1.08g/cm3)),高粘度、高胶质+沥青质和高含硫量(6.5%~15%)等特征;正构烷烃常常呈明显的偶数碳优势,环烷烃和异构烷烃含量很高,有的甚至掩盖正构烷烃的分布,表现出未熟油和非生物降解的特征。其盐湖相和强还原或硫酸盐环境沉积的含膏泥岩在未成熟阶段具有丰富的可溶有机质含量(“A”大于0.2%)。并非干酪根热降解成烃,而是浮游水生生物的残留烃类,它具有较高的转化率,“A”/TOC平均达55%和有利的排烃条件,具备了形成未熟油藏的条件而且具有良好的勘探前景。Abstract: Immature oils in the Zhaolanzhuang and Zhaoxian oil-fields are generated from Es4-Ek1source rocks(Ro around 0.4%)with gypsum collected form the north-middle Jingxian sag of the Jizhong depression.Characteristics of the immature oil are of high viscosity(0. 98-1.08 g/cm3)and H2S( 6.5%-15%)amount of soluble organic matter is more than 0.2%,the ratio of soluble organic matter total organiccarldn is 55% It has abundant asphaltense, cyclohydrocarbons and isohydrocarbons. n-Alkanes are dom-inated by even carbon. The area has a favorable expulsion condition and bright exploration prospect.
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Key words:
- Jihong /
- depression /
- immature oil
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[1] 1 David K Buskin and Kenneth E Peters, Larly Generation Char-acteristics of a Sulfur-rich Monter Kerogen. A A A G. 1992, 76(1):1-13.
2 王静等.晋县凹陷中北部生物残留烃原油的勘探前景.古潜山.1994.(2): 27-35.
3 曾宪章.梁狄刚.中国陆相原油和生油岩中的生物标志物.兰州:甘肃科学技术出版社,1989.215-227. -

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