ENRICHMENT AND STABILITY OF ENDOGENOUS MICROBIAL COMMUNITY IN CRUDE OIL PHASE OF RESERVOIR-PRODUCED FLUID

WANG Fangzhou; WEI Yanfeng; ZHU Fangfang; XIA Ziyuan; GOU Min; TANG Yueqin

doi:10.13205/j.hjgc.202410006

Volume 42 Issue 10

Oct. 2024

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WANG Fangzhou, WEI Yanfeng, ZHU Fangfang, XIA Ziyuan, GOU Min, TANG Yueqin. ENRICHMENT AND STABILITY OF ENDOGENOUS MICROBIAL COMMUNITY IN CRUDE OIL PHASE OF RESERVOIR-PRODUCED FLUID[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(10): 41-49. doi: 10.13205/j.hjgc.202410006

Citation:

WANG Fangzhou, WEI Yanfeng, ZHU Fangfang, XIA Ziyuan, GOU Min, TANG Yueqin. ENRICHMENT AND STABILITY OF ENDOGENOUS MICROBIAL COMMUNITY IN CRUDE OIL PHASE OF RESERVOIR-PRODUCED FLUID[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(10): 41-49. doi: 10.13205/j.hjgc.202410006

Citation:

WANG Fangzhou, WEI Yanfeng, ZHU Fangfang, XIA Ziyuan, GOU Min, TANG Yueqin. ENRICHMENT AND STABILITY OF ENDOGENOUS MICROBIAL COMMUNITY IN CRUDE OIL PHASE OF RESERVOIR-PRODUCED FLUID[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(10): 41-49. doi: 10.13205/j.hjgc.202410006

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ENRICHMENT AND STABILITY OF ENDOGENOUS MICROBIAL COMMUNITY IN CRUDE OIL PHASE OF RESERVOIR-PRODUCED FLUID

doi: 10.13205/j.hjgc.202410006

College of Architecture and Environment, Sichuan University, Chengdu 610065, China

Received Date: 2023-12-18
Available Online: 2024-11-30

Abstract

Abstract

The crude oil phase of reservoir-produced fluid has been considered as an ideal environment for obtaining crude oil-degrading bacteria in recent years, but there is little research on microbial isolation from the crude oil phase. In this study, the microbial community structure in the aqueous-oil phase of the produced fluid from six oil wells located in the North China Oilfield was compared. Then, the endogenous community in the six crude oil phases was enriched, respectively. At the same time, the community succession in the process of enrichment was dynamically tracked. Finally, the response of the enriched communities to continuous disturbance of environmental factors was investigated. The results showed that the microbial diversity and richness in the crude oil phase were higher than those in the aqueous phase, and there were significant differences in the community structure between the two phases. The crude oil phases from well P1^#, 92^#, and 99^# contained 111, 23, and 9 unique OTUs, respectively. After 10 generations of continuous enrichment, the crude oil degradation rates of enriched communities 15^#, 92^#, and P1^# gradually increased and tended to be stable, and the maximum degradation rate was 81.9%, 71.5%, and 63.6%, respectively. The dominant bacteria in the community 15^# mainly included Brevibacillus (89.3%), Novibacillus (8.0%), and Bacillus (1.5%), while Brevibacillus was the absolute dominant bacteria (with a relative abundance of 99%) in the community 92^# and P1^#. Under the multiple disturbances of temperature and oxygen, the microbial composition and abundance of community P1^# changed. The dominant Brevibacillus was suppressed while the relative abundance of Paenibacillus and Aneurinibacillus increased, resulting in the accumulation of medium and long chain alkanes (C18 to C29). However, community 15^# and 92^# can maintain stable ability of alkane degradation. These results indicated that the crude oil phase of the produced liquid can act as a potential microbial source for exploring crude oil-degrading bacteria.
- crude oil phase,
- microbial community,
- enrichment,
- crude oil degradation,
- environmental disturbance

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References(31)

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