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

被引：0
|
作者：
Liu M. [1 ]
Hao F. [1 ]
Wang Q. [1 ]
Niu C. [2 ]
Tian J. [2 ]
机构：
[1] School of Geosciences, China University of Petroleum, Qingdao
[2] Tianjin Branch of China National Offshore Oil Corporation Limited, Tianjin
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 10期
关键词：
Alteration; Bozhong sag; Crude oil; Hydrocarbon; Light hydrocarbons; Maturity; Organic matter input;
D O I：
10.3799/dqkx.2021.033
中图分类号：
学科分类号：
摘要：
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. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：3645 / 3656
页数：11
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