| 四川盆地震旦系陡山沱组烃源岩地球化学特征与有机质富集机制 |
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| 引用本文： | 王文之,肖文摇,和源,左兆喜,邓思思,曹剑.四川盆地震旦系陡山沱组烃源岩地球化学特征与有机质富集机制[J].高校地质学报,2019,25(6):860. |
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| 作者姓名： | 王文之 肖文摇 和源 左兆喜 邓思思 曹剑 |
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| 作者单位： | 中国石油西南油气田公司勘探开发研究院,成都610051;南京大学地球科学与工程学院,南京210023 |
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| 基金项目： | 国家科技重大专项;国家科技重大专项 |
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| 摘 要： | 深层古老层系在油气勘探中的重要性正越来越受到重视，四川盆地震旦系陡山沱组是中国南方这一领域的潜在烃源岩层系，但过去因关注少而研究程度低。为加深对其理解，文章以样品条件较好的四川盆地东北缘城口明月乡剖面为例，采用岩石学、主、微量及稀土元素等综合分析的方法，系统探讨了陡山沱组泥页岩的地球化学特征和有机质富集机制。结果表明，陡山沱组发育了一套富有机质的泥页岩，主体沉积于次氧化—还原水体环境，显著的Eu 正异常表明沉积时受热液活动影响明显。烃源岩有机质富集显著受控于沉积环境，同时由于沉积时整体处于较低的沉积速率，使得自下而上随沉积速率增大，有机质逐渐富集。此外，热液活动促进了有机质富集。陡山沱组具有资源潜力，但非均质性发育，可能与冰期—间冰期的海平面升降有关。
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| 关 键 词： | 古老含油气系统 深层 元素地球化学 有机质富集 陡山沱组 四川盆地 |
Geochemical Characteristics of the Sinian Doushantuo FormationSource Rocks of the Sichuan Basin: Implications for the Organic Matter Accumulation |
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| WANG Wenzhi,XIAO Wenyao,HE Yuan,ZUO Zhaoxi,DENG Sisi,CAO Jian.Geochemical Characteristics of the Sinian Doushantuo FormationSource Rocks of the Sichuan Basin: Implications for the Organic Matter Accumulation[J].Geological Journal of China Universities,2019,25(6):860. |
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| Authors: | WANG Wenzhi XIAO Wenyao HE Yuan ZUO Zhaoxi DENG Sisi CAO Jian |
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| Institution: | 1. Exploration and Development Research Institute of Southwest Oil and Gas Field Company (CNPC), Chengdu 610051, China;
2. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China |
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| Abstract: | Deep ancient strata system is getting more and more attention in the field of hydrocarbon exploration, among which the Sinian Doushantuo Formation of the Sichuan Basin is considered as one of the most potential source rock. During the past decades, few work aimed at this formation had been taken. To deepen understanding of the Doushantuo Formation as a set of potential source rock, taking well-sampled Minyuexiang Section of Chengkou County of northeastern of Sichuan Basin as a case, the geochemical characteristics and organic matter accumulation mechanism of Doushantuo shale are systematically discussed by means of comprehensive analysis of petrology, major, trace and rare earth elements. The results show that the organic-rich black shale developed in the Doushantuo Formation was mainly deposited in suboxic-anoxic environment, and significant positive Eu anomalies indicate that the Doushantuo Formation wasinfluenced by hydrothermal activity during the sedimentation process. The organic matter accumulation is strongly controlled by the anoxic sedimentary environment. Due to the low sedimentation rate, the organic matter gradually enriched with the increase of deposition rate from bottom to top. In addition, hydrothermal activity led to the elevated accumulation and burial of organic matter. Further, the Doushantuo Formation has certain oil and gas potential, but its heterogeneity is developed, which may be related to the eustatic change during the glacial-interglacial period. |
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| Keywords: | ancient petroleum system deep strata element geochemistry organic matter accumulation Doushantuo Formation Sichuan Basin |
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