Oil & Gas Geology ›› 2020, Vol. 41 ›› Issue (4): 800-810.doi: 10.11743/ogg20200413
• Petroleum Geology • Previous Articles Next Articles
Received:
2019-04-12
Online:
2020-08-01
Published:
2020-08-11
Contact:
Lunju Zheng
E-mail:274923143@qq.com;292002418@qq.com
CLC Number:
Jian Cheng, Lunju Zheng. Sedimentary geochemical characteristics of the Early Cambrian source rocks in Well Jinye 1 in southern Sichuan Basin[J]. Oil & Gas Geology, 2020, 41(4): 800-810.
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Table 1
Fundamental characteristics and identification criteria of oxidation-reduction conditions in sedimentation"
沉积环境识别标志 | 缺氧环境 | 富氧环境 | ||
厌氧 | 贫氧 | |||
水体溶氧量(体积分数)/‰ | <0.1 | 0.1~1 | >1 | |
水动力条件 | 低能、滞流、局限 | 高能、循环畅通 | ||
痕量元素 | 氧化态/还原态 | ω(Fe2+)/ω(Fe3+)>1 | ω(Fe2+)/ω(Fe3+)>1 | |
痕量元素含量 | 过渡金属、有机硫、H2S含量高 | 过渡金属、有机硫、H2S含量低 | 过渡金属含量极低 | |
ωV/(ωV+Ni) | >0.54 | 0.46~0.54 | <0.46 | |
ωV/ωCr | >4.25 | 2.00~4.25 | <2.00 | |
ωNi/ωCo | >7.00 | 5.00~7.00 | <5.00 | |
ωU/ωTh | >1.25 | 0.75~1.25 | <0.75 | |
δU | ≥1.00 | <1.00 | ||
稀土元素 | δCe | 正常-正异常,δCe≥1 | 负异常,δCe<1 | |
δEu | 正常-正异常,δEu≥1 | 负异常,δEu<1 | ||
ωCe/ωLa | >2.00 | 1.50~1.80 | <1.50 |
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