石油与天然气地质 ›› 2004, Vol. 25 ›› Issue (1): 44-48,69.doi: 10.11743/ogg20040108

• 成藏机理 • 上一篇    下一篇

东濮凹陷文留潜山构造文古2井原油地球化学特征和油源研究

常俊合, 李新军, 吕红玉, 王又杰, 孙青, 段红梅   

  1. 中国石化中原油田分公司,河南濮阳 457001
  • 收稿日期:2004-01-12 出版日期:2004-02-25 发布日期:2012-01-16

A study on geochemical characteristics and sources of oil produced from Wengu 2well in Wenliu buried hill in Dongpu depression

Chang Junhe, Li Xinjun, L? Hongyu, Wang Youjie, Sun Qing, Duan Hongmei   

  1. Zhongyuan Oilfeid Company, SINOPEC, Puyang, Henan
  • Received:2004-01-12 Online:2004-02-25 Published:2012-01-16

PDF (PC)

655

被引次数

20

摘要：

油源对比是追溯新的油层和指导勘探的重要手段之一。在对文古2井原油地球化学特征研究的基础上,应用碳同位素和生物标志化合物对比方法,结合区域地质背景,综合分析了原油与潜在源岩的关系。研究表明,文古2井原油具有族组成中烃类组分含量高,极性组分含量低,组分和全烃碳同位素轻,主峰碳为nC17,呈前峰型单峰分布,伽马蜡烷和奥利烷生物标志物化合物含量丰富的特征。油源对比结果显示,文古2井潜山油藏属"新生古储"型,油源岩以下第三系泥岩为主。主要表现在文古2井原油和下第三系湖相暗色泥岩碳同位素值及曲线分布趋势非常相近,均含有高的伽马蜡烷和奥利烷化合物;煤系源岩抽提物和模拟油碳同位素重,伽马蜡烷含量低,无奥利烷,与文古2井原油差异显著。

关键词: 原油, 地球化学, 碳同位素, 生物标志化合物, 油源对比, 下第三系, 东濮凹陷

Abstract:

Oil source correlation is one of the important methods to trace new oil layers and guide exploration. Based on analysis of geochemical behaviors of oil produced from Wengu 2well, correlation of crude oil and potential source rocks has been made through comparing carbon isotopes and biomarkers in combination with the regional geologic setting.As for the crude oil in Wengu 2well, hydrocarbon content is high,while nonhydrocarbons + asphaltenes content is low in its group components; the δ13C in the components and whole hydrocarbon is light;the main peak's carbon is nC 17; and gammacerane and oleanane are abundant. Oil-source correlation indicates that the Wengu 2well buried hill reservoir belongs to young source rock and old reservoir rock type,and the Paleogene mudstone is the main source rock.The crude oil and the extract from Paleogene dark-colored mudstone have very similar δ13C value and distribution,and both of them have high gammacerane and oleanane contents. The extract from coal-measure source rock and simulated oil have large δ13C value, low gammacerane content and no oleanane,significantly different from the crude oil in Wengu 2well.

Key words: crude oil, geochemistry, carbon isotope, biomarker, oil-source correlation, Paleogene, Dongpu depression

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