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从歧南凹陷QN3井有机碳、饱和烃气相色谱分析等多种化验分析资料出发,对QN3井各层段地层暗色泥岩有机质进行系统评价。评价结果认为,歧南凹陷东一段属于非烃源岩,东二段以中等烃源岩为主,部分为好烃源岩,东三段、沙一段、沙二段和沙三段均属于好烃源岩,干酪根类型以Ⅰ2型为主,但浅层成熟度偏低,进入生油门限的深度在2 900~3 000 m之间;埋深在3 400~3 500 m之间时开始大量生油,具备生成工业油气的条件。
Based on a variety of laboratory analysis data, such as organic carbon and saturated hydrocarbon gas chromatographic analysis of QN3 wells in Qiaonan depression, the organic matter of dark mudstone in each interval of QN3 well was systematically evaluated. According to the evaluation results, the eastern section of the Qiaonan Depression belongs to the non-source rock, while the middle part of the second section of the Qiaonan Sag is dominated by medium source rocks and some are good source rocks. The third, third and fourth sections of Shahejie, Source rocks and kerogen types are mainly Type I2, but the shallow maturity is low, the depth of access to the oil threshold is between 2 900 m and 3 000 m, and when the depth is between 3 400 m and 3 500 m, Oil, with the conditions for the generation of industrial oil and gas.