Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad
The sensitivity of biodegradation on diamondoids was investigated using a series of biodegraded oil samples from the Ronier tectonic unit of Bongor Basin, Chad. The results suggest that diamondoids, including adamantanes (As) and diamantanes (Ds), are relatively resistant to biodegradation and obvio...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2024-04-01
|
| Series: | Energy Geoscience |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666759223001063 |
| _version_ | 1797200782707130368 |
|---|---|
| author | Huanxin Song Menghan Chen Lirong Dou Dingsheng Cheng Zhigang Wen |
| author_facet | Huanxin Song Menghan Chen Lirong Dou Dingsheng Cheng Zhigang Wen |
| author_sort | Huanxin Song |
| collection | DOAJ |
| description | The sensitivity of biodegradation on diamondoids was investigated using a series of biodegraded oil samples from the Ronier tectonic unit of Bongor Basin, Chad. The results suggest that diamondoids, including adamantanes (As) and diamantanes (Ds), are relatively resistant to biodegradation and obvious biodegradation was observed in oils with a Peters-Moldowan (PM) biodegradation rank of 6 or more. Overall, the sensibility of biodegradation on diamondoids is generally similar to hopanes and regular steranes. As biodegradation evolves, the changes in concentration and components of diamondoids show that the biodegradation process is selective and stepwise. The significant increase of MD/MA and DMD/DMA for oils with a PM ranking 6+ indicates that diamantanes are generally more resistant to biodegradation than adamantanes. The similar trends of DMA/MA, EA/MA, MD/D, DMD/MD and other relevant indexes, show that higher alkylation homologs are more resistant to biodegradation. The commonly used diamondoid ratios, such as MAI, EAI, MDI and DMID-1, are obviously affected by biodegradation at the stage of high-level biodegradation, which may indicate that these ratios should be used with caution in case of severely degraded oils. |
| first_indexed | 2024-03-11T03:13:11Z |
| format | Article |
| id | doaj.art-27a508964848432b85e3d11a7afe0c5a |
| institution | Directory Open Access Journal |
| issn | 2666-7592 |
| language | English |
| last_indexed | 2024-04-24T07:37:07Z |
| publishDate | 2024-04-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Energy Geoscience |
| spelling | doaj.art-27a508964848432b85e3d11a7afe0c5a2024-04-20T04:17:57ZengKeAi Communications Co., Ltd.Energy Geoscience2666-75922024-04-0152100260Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, ChadHuanxin Song0Menghan Chen1Lirong Dou2Dingsheng Cheng3Zhigang Wen4Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei, 430100, China; College of Resources and Environment, Yangtze University, Wuhan, Hubei, 430100, China; Corresponding author. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei, 430100, China.College of Resources and Environment, Yangtze University, Wuhan, Hubei, 430100, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, ChinaCollege of Resources and Environment, Yangtze University, Wuhan, Hubei, 430100, ChinaThe sensitivity of biodegradation on diamondoids was investigated using a series of biodegraded oil samples from the Ronier tectonic unit of Bongor Basin, Chad. The results suggest that diamondoids, including adamantanes (As) and diamantanes (Ds), are relatively resistant to biodegradation and obvious biodegradation was observed in oils with a Peters-Moldowan (PM) biodegradation rank of 6 or more. Overall, the sensibility of biodegradation on diamondoids is generally similar to hopanes and regular steranes. As biodegradation evolves, the changes in concentration and components of diamondoids show that the biodegradation process is selective and stepwise. The significant increase of MD/MA and DMD/DMA for oils with a PM ranking 6+ indicates that diamantanes are generally more resistant to biodegradation than adamantanes. The similar trends of DMA/MA, EA/MA, MD/D, DMD/MD and other relevant indexes, show that higher alkylation homologs are more resistant to biodegradation. The commonly used diamondoid ratios, such as MAI, EAI, MDI and DMID-1, are obviously affected by biodegradation at the stage of high-level biodegradation, which may indicate that these ratios should be used with caution in case of severely degraded oils.http://www.sciencedirect.com/science/article/pii/S2666759223001063DiamondoidsBiodegradationSensitivityCrude oilBongor BasinChad |
| spellingShingle | Huanxin Song Menghan Chen Lirong Dou Dingsheng Cheng Zhigang Wen Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad Energy Geoscience Diamondoids Biodegradation Sensitivity Crude oil Bongor Basin Chad |
| title | Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad |
| title_full | Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad |
| title_fullStr | Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad |
| title_full_unstemmed | Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad |
| title_short | Effects of biodegradation on diamondoid distribution in crude oils from the Bongor Basin, Chad |
| title_sort | effects of biodegradation on diamondoid distribution in crude oils from the bongor basin chad |
| topic | Diamondoids Biodegradation Sensitivity Crude oil Bongor Basin Chad |
| url | http://www.sciencedirect.com/science/article/pii/S2666759223001063 |
| work_keys_str_mv | AT huanxinsong effectsofbiodegradationondiamondoiddistributionincrudeoilsfromthebongorbasinchad AT menghanchen effectsofbiodegradationondiamondoiddistributionincrudeoilsfromthebongorbasinchad AT lirongdou effectsofbiodegradationondiamondoiddistributionincrudeoilsfromthebongorbasinchad AT dingshengcheng effectsofbiodegradationondiamondoiddistributionincrudeoilsfromthebongorbasinchad AT zhigangwen effectsofbiodegradationondiamondoiddistributionincrudeoilsfromthebongorbasinchad |