Evolution model and formation mechanism of bio-thermocatalytic transitional zone gas |
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Authors: | Wenhui Liu Yongchang Xu Jiyang Shi Huaiyan Lei Baisheng Zhang |
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Affiliation: | (1) Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) Guangzhou Institute of Geochemistry, The Chinese Academy of Sciences, 510640 Guangzhou, China |
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Abstract: | As a new genetic type of natural gas exploration area, the bio-thermocatalytic transitional zone gas (BTTZG) has been highly stressed by geologists both at home and abroad. Systematic study on the generation mechanism of hydrocarbon at the transitional zone is presented. Based on simulating experiments and geochemistry analysis of the source rock with lower evolution, a hydrocarbon-forming model at the transitional zone has been established. The mechanism is proposed that under the condition of low temperature and pressure combining with extremely active structural stress and clay mineral catalysis, BTTZG is formed by de-group of soluble organic matter and polarized compositions through orthocarbon ion as well as by condensation polymerization of aromatic ring-rich insoluble organic matter. This mechanism controls the formation of BTTZG, and furthermore, BTTZG is the product of superimposition and interaction of all the factors mentioned above. |
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Keywords: | BTTZ gas catalysis mechanochemistry hydrocarbon generation model |
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