渤中19-6潜山构造带凝析油中轻烃地球化学特征及意义

刘梦醒; 郝芳; 王奇; 牛成民; 田金强

doi:10.3799/dqkx.2021.033

Volume 46 Issue 10

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(10): 3645-3656

Liu Mengxing, Hao Fang, Wang Qi, Niu Chengmin, Tian Jinqiang, 2021. Light Hydrocarbon Geochemical Characteristics and Geological Significance of Buried Hill Condensate Oil in Bozhong 19-6 Structural Belt. Earth Science, 46(10): 3645-3656. doi: 10.3799/dqkx.2021.033

Citation:

Liu Mengxing, Hao Fang, Wang Qi, Niu Chengmin, Tian Jinqiang, 2021. Light Hydrocarbon Geochemical Characteristics and Geological Significance of Buried Hill Condensate Oil in Bozhong 19-6 Structural Belt. Earth Science, 46(10): 3645-3656. doi: 10.3799/dqkx.2021.033

Citation:

Liu Mengxing, Hao Fang, Wang Qi, Niu Chengmin, Tian Jinqiang, 2021. Light Hydrocarbon Geochemical Characteristics and Geological Significance of Buried Hill Condensate Oil in Bozhong 19-6 Structural Belt. Earth Science, 46(10): 3645-3656. doi: 10.3799/dqkx.2021.033

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Light Hydrocarbon Geochemical Characteristics and Geological Significance of Buried Hill Condensate Oil in Bozhong 19-6 Structural Belt

doi: 10.3799/dqkx.2021.033

1.
School of Geosciences, China University of Petroleum, Qingdao 266580, China
2.
Tianjin Branch of China National Offshore Oil Corporation Limited, Tianjin 300459, China

Received Date: 2020-11-30
Available Online: 2021-11-03
Publish Date: 2021-11-03

Abstract

Abstract

In order to clarify the geochemical characteristics and genesis of Bozhong 19-6 gas field in Bohai Bay basin, seven condensate oil samples from buried hill condensate gas reservoir in the study area are selected to conduct the whole-oil GC-MS test, and the light hydrocarbon composition characteristics are analyzed, and the geological application of light hydrocarbon parameters in the area were discussed. The results show that the Mango light hydrocarbon parameters K₁ and K₂ of Bozhong19-6 condensate oil are relatively stable, indicating that the genetic types of crude oil in the study area have good consistency. The C₆-C₈ compound component n-alkane has significant advantages, and the average methylcyclohexane index is 39%. Heptane value, isoheptane value and the ratio of n-heptane/methylcyclohexane (F) corresponds to high maturity. According to light hydrocarbon temperature parameters, the hydrocarbon generation temperature is 125.8-128.1 ℃, lower than the actual value maybe due to the phase change of condensate during sampling. The ratio of 2MP/3MP and 2MH/3MH in condensate oil is relatively high, while the K₂ value is low. The molar concentration of n-paraffins in condensate oil is distributed in three stages, and the content of toluene/n-heptane and crude oil wax increases with depth. Furthermore, combined with the saturated hydrocarbon parameters and adamantane parameters, it is revealed that the oil and gas in Bozhong 19-6 buried hill were formed in the high mature stage (Ro=1.05%-1.30%) of lacustrine sapropel type Ⅱ₁, which is adjusted by fractionation.
- light hydrocarbons,
- crude oil,
- organic matter input,
- maturity,
- alteration,
- Bozhong sag,
- hydrocarbon

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References(59)

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Light Hydrocarbon Geochemical Characteristics and Geological Significance of Buried Hill Condensate Oil in Bozhong 19-6 Structural Belt

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