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首页> 外文期刊>Journal of Asian earth sciences >Distribution and geodynamic setting of the Late Neoproterozoic- Early Cambrian hydrocarbon source rocks in the South China and Tarim Blocks
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Distribution and geodynamic setting of the Late Neoproterozoic- Early Cambrian hydrocarbon source rocks in the South China and Tarim Blocks

机译：南方和塔里木砌块的晚期新蛋白早期寒武纪碳烃源岩的分布与地球动力学环境

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摘要

The Late Proterozoic-Early Cambrian, one of the most critical intervals in Earth's history, is characterized by dramatic tectonic, climatic, oceanic and biological changes. In China, thick black mudstones and shales formed in intracontinental rifts during this period, associated with interglacial and postglacial phases of the Neoproterozoic global-scale glaciations. Previous studies have shown these black mudstones and shales were potential hydrocarbon source rocks that contributed to the Proterzoic-Early Paleozoic oil and gas discoveries. However, less work has been done to systematically characterize these important source rocks. In the South China Block, these excellent source rocks (similar to 30-200 m) were discovered in the Nanhua (Cryogenian), Sinian (Ediacaran), and Lower Cambrian Systems, with total organic carbon (TOC) contents of 2-10%. In contrast, black mudstones in the Nanhua and Sinian Systems in the Tarim Basin had low TOC contents (0.3-1.5%) perhaps affected by intense weathering, whereas excellent source rocks (TOC similar to 6-18%) existed in the Cambrian Yuertusi Formation (12-80 m). Our study indicates the formation and distribution of excellent source rocks were mainly controlled by the Late Proterozoic-Early Cambrian rifts, which was supported by a decrease in thickness towards marginal areas especially for the Nanhua and Sinian Systems. The Early Cambrian source rocks occurred per-vasively due to a global marine transgression and those formed under deep-water anoxic conditions at slope areas were of the best quality with TOC up to 15%. These source rocks could be focuses for future exploration in the deep or ultra-deep depths in the studied blocks as well as their peripheral areas.
机译：晚期正国古代早期的寒武纪，地球历史中最关键的间隔之一，其特点是戏剧性的构造，气候，海洋和生物学变化。在中国，在此期间，厚厚的黑色泥岩和肝肾形成，与内科特罗古世全球规模冰川的中间夹和后透明阶段相关。以前的研究表明，这些黑泥岩和索拉斯是潜在的碳氢化合物源岩，这有助于面古生代古生代石油和天然气发现。但是，已经完成了更少的工作来系统地表征这些重要的来源岩石。在南华街区，在南华（低温道），斯中（埃德基乙逊）和下寒武纪系统中发现了这些优秀的来源岩石（类似于30-200米），总有机碳（TOC）含量为2-10％ 。相比之下，南华州南华和锡安盆地中的南欧系统的黑泥岩有毒，可能受到强烈风化的影响低，而优秀的源岩（TOC类似于6-18％），存在于寒武纪Yuertusi的形成中存在（12-80米）。我们的研究表明，优异的源岩的形成和分配主要由晚期正面古代 - 早期寒册裂缝控制，这是由对南华和窦和SINIAN系统的边际领域的厚度下降支撑。由于全球海洋违规，坡地缺氧条件下形成的早期寒武纪源岩，坡度区域的最佳质量高达15％。这些源岩可以侧重于学习块中深层或超深度深度的未来探索以及其周边区域。

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