Three-dimensional migration and resistivity characteristics of crude oil in heterogeneous soil layers

Pan, Yamin; Zhang, Qian; Yu, Yewei; Tong, Yihan; Wu, Wenyu; Zhou, Youlin; Hou, Weifen; Yang, Jinsheng

doi:10.1016/j.envpol.2020.115309

Cited by 22 publications

(4 citation statements)

References 23 publications

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“…The migration of LNAPL in the groundwater environment is complex and involves a combination of physical, chemical, and biological processes (Pan et al, 2020). The complexity of LNAPL migration in groundwater environmental systems is mainly manifested by the complexities of in uencing factors as well as migration processes.…”

Section: Discussionmentioning

confidence: 99%

WITHDRAWN: Effect of unsaturated flow on the occurrence and movement of light nonaqueous phase fluids

Zhao,

Cheng,

et al. 2023

Preprint

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Contamination from light nonaqueous phase fluids (LNAPL) and their derivatives during mining, production, and transportation has become a concern. Scholars have extensively studied LNAPL contamination, but the role of water content variation on its migration process in the unsaturated zone has not been sufficiently researched. In this study, indoor simulated vertical, one-dimensional, multiphase flow soil column experiments were conducted on the sandy soil of the Zhengzhou reach of the Yellow River to analyze the effect of water content on the occurrence state and migration rate of LNAPL. The experimental results indicate: (1) The migration rate of LNAPL exhibits an L-shaped trend during subsurface imbibition and a nonlinear relationship with migration time, and the migration rate and migration time of surface infiltration have a linear growth relationship. (2) The adsorption rate of LNAPL is negatively correlated with water content and positively correlated with oil content in the homogeneous non-saturated state. As LNAPL moves from the aeration zone to the saturated zone, the relationship between oil content and water content is nonlinear. (3) When the water content of the test medium is below 14% and the oil content is below 11%, LNAPL appears in the aeration zone in a solid phase. As the water content increases, the adsorption rate of the oil phase gradually decreases and eventually reaches the oil saturation point. (4) When the water content of the medium exceeds 8%, over time, LNAPL will be subject to oil-water interfacial tension, and the rate of LNAPL movement first decreases and then increases, displaying nonlinear growth.

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Section: Discussionmentioning

confidence: 99%

WITHDRAWN: Effect of unsaturated flow on the occurrence and movement of light nonaqueous phase fluids

Zhao,

Cheng,

et al. 2023

Preprint

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“…The value of ∑n-alk/n-C16 in Y10, Y20, Y24 were less than 30, revealing these sites were contaminated by petroleum hydrocarbons. These sites were located in the drainage basin of Yanhe River, this might be the result of petroleum migration caused by the rainfall runoff in the partial area 36 . Carbon preference index (CPI) is calculated by the ratio of odd to even carbon-numbered n -alkanes.…”

Section: Resultsmentioning

confidence: 99%

Fingerprint analysis reveals sources of petroleum hydrocarbons in soils of different geographical oilfields of China and its ecological assessment

Liu

Xia

Wang

et al. 2022

Sci Rep

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The distribution and characteristics of petroleum in three different geographic oilfields in China: Shengli Oilfield (SL), Nanyang Oilfield (NY), and Yanchang Oilfield (YC) were investigated. The average concentration of the total petroleum hydrocarbons (TPHs) conformed to be in the following law: SL Oilfield > NY Oilfield > YC Oilfield. Fingerprint analysis on the petroleum contamination level and source was conducted by the geochemical indices of n-alkanes and PAHs, such as low to high molecular weight (LMW/HMW) hydrocarbons, n-alkanes/pristine or phytane (C17/ Pr, C18/Ph), and ratio of anthracene/ (anthracene + phenanthrene) [Ant/(Ant + Phe)]. Soils adjacent to working well oils indicated new petroleum input with higher ratio of low to high molecular weight (LMW/HMW) hydrocarbons. The oil contamination occurred in the grassland soils might result of rainfall runoff. Petroleum source, petroleum combustion source, and biomass combustion were dominant PAHs origination of soils collected from oil exploitation area, petrochemical-related sites, farmland and grassland, respectively. The suggestive petroleum control strategies were proposed in each oilfield soils. Ecological potential risk of PAHs was assessed according to the toxic equivalent quantity (TEQ) of seven carcinogenic PAHs. The results showed that high, medium, and low ecological risk presented in petro-related area, grassland soils, and farmland soils, respectively. High ecological risk was persistent in abandoned oil well areas over abandoned time of 15 years, and basically stable after 5 years. This study can provide a critical insight to ecological risk management and source control of the petroleum contamination.

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“…The sampling monitoring method can more truly reflect the change of concentration at each point in the sand tank [ 33 ]. In this study, the change of TPH at the same point before and after rainfall was used to characterize the displacement effect of precipitation on diesel; the displacement rate of diesel by rainfall was obtained by dividing the TPH difference before and after rainfall by the TPH before rainfall.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the LNAPL Migration Process in the Vadose Zone under Two Different Media Conditions

Zuo

Zhao

Yang

et al. 2021

IJERPH

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This study focused on the processes of free infiltration, precipitation displacement, and natural attenuation of the LNAPL under the condition of near-surface leakage. Sandbox experiments were performed to explore the migration characteristics of LNAPL in the vadose zone with two media structures and the influences of the soil interface on the migration of LNAPL. The results indicate that the vertical migration velocity of the LNAPL infiltration front in medium and coarse sand was 1 order of magnitude higher than that in fine sand and that the LNAPL accumulated at the coarse–fine interface, which acted as the capillary barrier. Displacement of precipitation for LNAPL had little relationship with rainfall intensity and was obviously affected by medium particle size, where coarse sand (40.78%) > medium sand (20.5%) > fine sand (10%). The natural attenuation rate of the LNAPL in the vadose zone was related to the water content of the media; the natural attenuation rate of fine sand was higher. This study simulated the process of the LNAPL leakage from the near surface into the layered heterogeneous stratum, improved the understanding of the migration of the LNAPL under different stratum conditions, and can provide support for the treatment of LNAPL leakage events in the actual site.

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Three-dimensional migration and resistivity characteristics of crude oil in heterogeneous soil layers

Cited by 22 publications

References 23 publications

WITHDRAWN: Effect of unsaturated flow on the occurrence and movement of light nonaqueous phase fluids

WITHDRAWN: Effect of unsaturated flow on the occurrence and movement of light nonaqueous phase fluids

Fingerprint analysis reveals sources of petroleum hydrocarbons in soils of different geographical oilfields of China and its ecological assessment

Analysis of the LNAPL Migration Process in the Vadose Zone under Two Different Media Conditions

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