合肥盆地大桥凹陷油苗地球化学特征及油源分析
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摘要
合肥盆地沉积有厚度较大的中新生代地层,但目前尚未发现工业性油流,甚至油气显示也很微弱,所以,证实盆地内部含油气系统的存在具有重要性和迫切性。合肥盆地东北部发现了确切的原油显示,对该原油显示饱和烃气相色谱、色谱-质谱、单体烃碳同位素分析以及油源对比表明,这一原油显示为一成熟原油,母质来源为菌藻类低等水生生物,油源可能为下白垩统朱巷组,朱巷组暗色泥岩可能是一套有效烃源岩。
Hefei Basin was a thick Mesozoic-Cenozoic sediment, there was no industrial oil discovered, even oil seepage was scare. Therefore, it was great significance and urgency to prove existence of hydrocarbon-bearing system in the basin. Now crude oil show was discovered exactly in the north-east of the basin. The oil seepage was analyzed by means of organic geochemistry, including saturated hydrocarbon gas chromatogram, biomarker chromatography-mass spectrometer, stable carbon isotope analysis and oil-source correlations. The result shows that the crude oil is mature oil derived from low-grade algae and bacteria, and may be sourced from the Zhuxiang Formation of Lower Cretaceous. Thus Zhuxiang Formation may be the effective hydrocarbon sources rocks of the basin. These findings have some inspiration for studying the hydrocarbon existence and petroleum exploration in Hefei Basin.
Hefei Basin was a thick Mesozoic-Cenozoic sediment, there was no industrial oil discovered, even oil seepage was scare. Therefore, it was great significance and urgency to prove existence of hydrocarbon-bearing system in the basin. Now crude oil show was discovered exactly in the north-east of the basin. The oil seepage was analyzed by means of organic geochemistry, including saturated hydrocarbon gas chromatogram, biomarker chromatography-mass spectrometer, stable carbon isotope analysis and oil-source correlations. The result shows that the crude oil is mature oil derived from low-grade algae and bacteria, and may be sourced from the Zhuxiang Formation of Lower Cretaceous. Thus Zhuxiang Formation may be the effective hydrocarbon sources rocks of the basin. These findings have some inspiration for studying the hydrocarbon existence and petroleum exploration in Hefei Basin.
引文
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[5]谭明友,陶明信,贾红义,等.合肥盆地地质格架演化及油气条件分析[J].煤田地质与勘探,2003,31(4):1~5.
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[7]李丕龙,李学田,宋明水,等.合肥盆地石油地质与地球物理特征研究及进展[M].北京:地质出版社,2003.23~30.
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目录
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