辽宁金羊盆地羊D1井油砂地球化学特征及意义

发布时间：2018-04-01 10:19

  本文选题：金羊盆地　切入点：羊D井　出处：《地质通报》2017年04期

【摘要】：在中国地质调查局沈阳地质调查中心实施的"羊D1"井的中侏罗统髫髻山组火山岩中见多处油气显示,取得了油气新发现。对该井已发现的2件油砂样品中的原油采用气相色谱-质谱技术(GC-MS)进行了分析测试,结果显示,2个油砂样品的地球化学特征一致,表现为链烷烃呈现出单峰态的分布,主峰碳数分别为C_(21)和C_(22),无明显奇碳数优势,姥植比值低;萜类化合物表现为,三环萜烷以C_(23)为主峰呈正态分布,C_(24)四环萜烷与C_(26)三环萜烷丰度相当,伽马蜡烷含量较高;甾类化合物表现为规则甾烷相对含量关系为C_(27)C_(29)C_(28),以C_(27)甾烷占优势的不对称"V"形分布。这些指标总体指示,原油为成熟油,对应烃源岩沉积于偏还原性的湖相环境,母质来源主要为藻类等低等水生生物,陆源高等植物也具有一定贡献。通过和周边的北票组烃源岩进行油岩对比研究发现,油砂样品中的原油可能来自于盆地内下伏的下侏罗统北票组烃源岩的贡献。研究结果说明,北票组在金羊盆地分布广泛,其烃源岩可能具有较好的生油潜力,金羊盆地是一个具有勘探潜力的含油气盆地。
[Abstract]:In the volcanic rocks of the Tiaojishan formation of the Middle Jurassic in the YangD1 well implemented by the Shenyang Geological Survey Center of China Geological Survey, there are many oil and gas indications in the volcanic rocks of the Tiaojishan formation in the Middle Jurassic. A new discovery of oil and gas has been made. The crude oil of 2 oil sand samples found in this well has been analyzed and tested by gas chromatography-mass spectrometry (GC-MS). The results show that the geochemical characteristics of the two oil sand samples are the same. The main peak carbon number of alkanes is C _ (21) and C _ (22). There is no obvious advantage of odd carbon number, and the ratio of base-planting is low. The terpenoids are characterized by, The main peak of tricyclic terpene is CX 23). The main peak of tricyclic terpene is normal distribution (CX) 24) tetracyclic terpene is the same as CX 26) tricyclic terpene is abundant, and the content of gamma-wax is relatively high. The relative content of steroid compounds shows a regular relationship of relative sterane content in the form of C _ S _ 27C _ T _ 29C _ T _ T _ (28), based on the asymmetric "V" shape distribution of sterane dominance. These indexes indicate that the crude oil is a mature oil, corresponding to the source rock deposited in a deoxidizing lacustrine environment, and that the source rock is deposited in a deoxidizing lacustrine environment. The source of parent material is mainly algae and other low-grade aquatic organisms, and terrestrial higher plants also have some contribution. A comparative study of oil and rock with the surrounding source rocks of Beipiao formation shows that, The crude oil in the oil sand samples may come from the source rocks of the lower Jurassic Beipiao formation in the basin. The results show that the Beipiao formation is widely distributed in the Jinyang Basin, and its source rocks may have good oil generation potential. Jinyang Basin is an oil and gas bearing basin with exploration potential.
【作者单位】： 中国地质调查局沈阳地质调查中心;中国石油辽河油田分公司;长江大学资源与环境学院;
【基金】：中国地质调查局项目《松辽外围南部盆地群油气基础地质调查》(编号:DD20160167)和《辽宁金羊盆地油气基础地质调查》(编号:12120115001301)
【分类号】：P618.13
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本文编号：1695148