Geochemistry of petroporphyrins in oil-generating formations in North China |
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| Authors: | Chongzhong Sun |
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| Institution: | 1. Environmental Protection Bureau of Shandong Prcirnce, Shandong, China
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| Abstract: | With oil-generating formations in the Dongying basin as the objective of study, this paper deals with the relations among petroporphyrins, lithology, oxidation-reduction conditions, maturation and conversion of organic matter, and burial depth. It is considered that the content of petroporphyrins in the oil-generating formations depends on the quantity and nature of organic matter, sediment ary environment and burial depth. There is a porphyrin-rich interval at 2,200–2,700 m with the corresponding geothermal temperature ranging from 93° to 119°C. It is also an oil-accumulating zone. Nickel in the crude or in the nucleus of petroporphyrin is accumulated during the process of oil generation. Nickel-porphyrin abundance in the oil-generating formations has a negative correlation with the content of nickel. Evaluation of the oil-generating formations has been made on the bosis of petroporphyrin data. |
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