Main controlling factors of organic matter enrichment of the Mesoproterozoic source rocks from the North China Craton,Geological Journal

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Main controlling factors of organic matter enrichment of the Mesoproterozoic source rocks from the North China Craton
Geological Journal ( IF 1.4 ) Pub Date : 2020-08-23 , DOI: 10.1002/gj.3967
Jun Cai _{1,

2} , Shunshe Luo ₃ , Yulong Guan ₁ , Pingting Dong ₄

Affiliation

Despite the discovery of dozens of primary Mesoproterozoic petroleum fields with a large amount of petroleum reservoirs, which were not considered to be exploration targets previously, little information is available on the main controlling factors of the organic matter enrichment of the Mesoproterozoic source rocks. In this study, based on geochemical element and total organic carbon (TOC) analyses of samples collected from four sets of the Mesoproterozoic source rocks in the North China Craton (NCC), namely, the Cuizhuan, Chuanlinggou, Hongshuizhuang, and Xiamaling formations, an attempt was made to determine the primary productivity and redox conditions during the deposition of these stratigraphic units. The quantitative primary productivity (PP) indicated that the palaeo‐productivity was moderate to high during the deposition of the Xiamaling, Chuanlinggou, and Hongshuizhuang formations, all of which coincide with upwelling areas, and the palaeo‐productivity was low during the deposition of the Cuizhuan Formation, which correspond to continental shelf or open ocean. The vanadium versus chromium, the nickel versus chromium, the enrichment factor of molybdenum versus that of uranium, and the pristane versus phytane ratios indicate that the source rocks of the Hongshuizhuang and Xiamaling formations were accumulated in anoxic‐sulphidic environments; however, most source rocks of the Cuizhuan and Chuanlinggou formations were accumulated in oxic‐suboxic settings. High TOC values are only exhibited in the source rocks from the Hongshuizhuang and Xiamaling formations, suggesting that the organic matter enrichment degree in the Mesoproterozoic source rocks was likely controlled by both the PP and consequent bottom‐water redox conditions.

中文翻译：

华北克拉通中元古代烃源岩有机质富集的主要控制因素

尽管发现了数十个具有大量石油储集层的中元古代原始油田，这些地区以前都不被视为勘探目标，但关于中元古代烃源岩有机质富集的主要控制因素的信息很少。在这项研究中，基于地球化学元素和总有机碳（TOC）分析，从华北克拉通（NCC）的四组中元古代烃源岩中采集的样品，分别为翠砖，川岭沟，红水庄和下马岭组。试图确定这些地层单元沉积过程中的主要生产率和氧化还原条件。定量初级生产力（PP）表明，在下马岭沉积期间，古生产力处于中等至较高水平，川岭沟组和红水庄组均与上升区一致，而在翠砖组沉积期间古生产力较低，这与大陆架或大洋相适应。钒对铬，镍对铬，钼对铀的富集系数以及p烷对植烷的比例表明，红水庄和下马岭组的烃源岩是在缺氧-硫化环境中积累的。但是，翠砖组和川岭沟组的大部分烃源岩都聚集在含氧-硫酸盐的环境中。高TOC值仅在红水庄和下马岭组的烃源岩中表现出来，

更新日期：2020-08-23

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