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首页> 外文期刊>Journal of Asian earth sciences >Geochemical characteristics and depositional environment of Paleogene lacustrine source rocks in the Lufeng Sag, Pearl River Mouth basin, South China Sea
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Geochemical characteristics and depositional environment of Paleogene lacustrine source rocks in the Lufeng Sag, Pearl River Mouth basin, South China Sea

机译：南海珠江口盆地陆丰凹陷古近纪湖相烃源岩地球化学特征及沉积环境

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摘要

A systematic geochemical analysis of samples from newly drilled wells in the Lufeng Sag, Pearl River Mouth Basin has been carried out to characterize source rock quality, determine organic matter input and reconstruct the depositional environment of the Enping and Wenchang formations. Total organic carbon (TOC) content ranges from 0.46 to 1.57 wt% in the Enping formation, and from 0.53 to 6.10 wt% in the Wenchang formation. Kerogen types I-II were identified in the Wenchang formation samples, while kerogen types II-III were identified in the Enping formation samples. Maturity parameters suggest marginally mature to mature levels for most samples with higher maturity for the Wenchang formation samples. Biomarker assemblage and trace element ratios of the Wenchang and Enping formations are distinctively different, indicating predominantly aquatic origin organic matter input under suboixc-anoxic water conditions for the Wenchang formation and more allochthonous terrestrial organic matter input under oxic water conditions for the Enping formation. Moderate to high primary productivity and temperature drove water stratification, together with weak detrital material dilution led to the enrichment of organic matter in the Wenchang formation. While the low primary productivity, poor preservation conditions and high dilution led to the relatively poor source rock quality in the Enping formation.
机译：对珠江口盆地陆丰凹陷新钻井的样品进行了系统的地球化学分析，以表征烃源岩质量，确定有机质输入量并重建恩平和文昌地层的沉积环境。恩平组的总有机碳含量为0.46至1.57 wt％，文昌组的总有机碳含量为0.53至6.10 wt％。文昌组样品中鉴定出I-II型干酪根，恩平组样品中鉴定出II-III型干酪根。成熟度参数表明，对于大多数样品，成熟度略高，而对于文昌组样品，则成熟度更高。文昌组和恩平组的生物标志物组合和微量元素比率明显不同，这表明文昌组在次氧化-缺氧水条件下主要输入水生有机物，而恩平组在氧水条件下主要输入陆相有机物。中等至较高的初生生产力和温度驱使水分层，再加上碎屑物质稀薄，导致文昌组有机质富集。一次生产力低，保存条件差和稀释度高导致恩平地层的烃源岩质量相对较差。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第3期|60-77|共18页
  • 作者

    Niu Zicheng; Liu Guangdi; Ge Jiawang; Zhang Xiangtao; Cao Zhe; Lei Yongchang; An Yuan; Zhang Mengyuan;

  • 作者单位

    China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China|China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China|China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China|China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China;

    China Natl Offshore Oil Corp Ltd Shenzhen, Shenzhen 518057, Peoples R China;

    China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China|China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China;

    China Natl Offshore Oil Corp Ltd Shenzhen, Shenzhen 518057, Peoples R China;

    China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China|China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China|China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Source rock; Biomarker assemblage; Trace elements; Redox conditions; Lufeng Sag;

    机译：烃源岩;生物标志物组合;痕量元素;氧化还原条件;陆丰凹陷;

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