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通过对中国东部两个陆相断陷盆地原油样品的详细地球化学分析,研究原油中烷基酚控制因素.开鲁盆地陆家堡凹陷的原油来源于下白垩统源岩,而渤海湾盆地东营凹陷的原油来源于古近系源岩.每个盆地中所有原油经历了较短的运移距离,并且具有相似的成熟度.不同油田同系物分布的差异可能是由源岩有机相变化引起的.与东营凹陷相比,陆家堡凹陷原油明显具有较高的C3-酚含量(前缀指连接到苯酚分子上的烷基碳数),而甲酚和C2-酚含量较少.烷基酚的异构体分布,特别是C3-酚异构体分布可能受沉积环境控制:偏氧化的淡水环境容易形成丙基或异丙基取代的C3-烷基酚,而强还原的咸水环境更容易形成三甲基取代的C3-烷基酚.同一油气系统中运移分馏作用是影响原油中烷基酚浓度变化的重要因素,原油中烷基酚浓度沿运移方向降低.结合地质因素,烷基酚浓度可以区分不同的输导体系:当原油沿砂体运移时,烷基酚浓度降低明显,但沿断层垂向运移时,烷基酚浓度变化不大.但许多可能与运移距离有关的异构体比值并不像烷基咔唑那样有效地指示油气运移方向,表明酚类化合物分布的影响因素复杂.
Based on the detailed geochemical analysis of crude oil samples from two continental rift basins in eastern China, the control factors of alkylphenol in crude oil were studied.The crude oil in Lujiabao Sag of Kailu Basin originated from Lower Cretaceous source rocks, while the Dongying, Bohai Bay Basin The sags of crude oil come from Paleogene source rocks, and all the crude oil in each basin experienced short migration distance and similar maturity.Differences in the distribution of homologues in different oil fields may be caused by the changes of organic phase in source rocks Compared with the Dongying sag, the crude oil in Lujiabao depression obviously has a higher content of C3-phenol (the prefix refers to the number of alkyl carbons attached to the phenol molecule), while the content of cresol and C2-phenol is lower. The isomer distribution, especially the C3-phenoisomer distribution, may be controlled by the depositional environment: the partially oxidized freshwater environment tends to form propyl- or isopropyl-substituted C3-alkylphenols, whereas the strongly reduced saline-water environment Easy to form trimethyl-substituted C3-alkylphenol.The migration and fractionation in the same oil and gas system is an important factor that affects the change of alkylphenol concentration in crude oil.The alkylphenol concentration in crude oil decreases along the migration direction.Combined with the geological factors, Alkylphenol concentrations can be distinguished from none The same transport system: When the crude oil migrates along the sand body, the concentration of alkylphenols decreases obviously, but the concentration of alkylphenol does not change much along the vertical migration of the fault, but many isoforms that may be related to the migration distance The bulk ratio does not indicate the migration direction of hydrocarbons as effectively as alkylcarbazoles, indicating that the influencing factors of the distribution of phenolic compounds are complex.