Quantitative relationship between the resistivity distribution of the by-product plume and the hydrocarbon degradation in an aged hydrocarbon contaminated site

Shao, Shuai; Guo, Xinglin; Chang, Guiran; HuiFang, Liu

doi:10.1016/j.jhydrol.2021.126122

Cited by 16 publications

(2 citation statements)

References 60 publications

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“…The results show that the measured resistivity generally increases with increasing oil content, which are consistent with existing studies for fresh oil contamination in sandy sediments (Schmutz et al ., 2010; Revil et al ., 2017). However, this observation contradicts with the electrical signatures observed at aged hydrocarbon sites (Aal et al ., 2006; Flores Orozco et al ., 2021; Shao et al ., 2021). Their results showed that organic contaminants generally decrease the resistivity (correspondingly increase the real conductivity).…”

Section: Discussionmentioning

confidence: 99%

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Deng

Qian

Luo

et al. 2022

Near Surface Geophysics

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Researchers around the world have carried out numerous studies on the electrical response of oil‐contaminated silica sands. However, few studies consider the oil contamination in carbonate sands that exhibit quite different characteristics to silica sands. The purpose of this work is to study the influence of grain size (0.5–1.0, 1–3 and 3–5 mm), solution salinity (100, 10 and 1 Ω·m) and pH (4.58, 6.5 and 9.25) on the resistivity and saturation exponent of oil‐bearing carbonate sands. Experimental columns were packed with crushed limestone grains, solution and oil. Electrical resistivity measurements were subsequently performed on the packed columns. Grain size exhibits a complex effect on the electrical response of partially saturated limestone grains. Resistivity decreases slightly with increasing grain size when water saturation is greater than 0.4, while it shows an inconsistent trend when water saturation is lower than 0.4. The resulting saturation exponent n decreases slightly when grain size increases from 0.5–1 mm to 1–3 mm, while it shows a positive change in n values for grain size of 3–5 mm. Changes in solution salinity significantly influence the resistivity and saturation exponent of limestone grains, with higher solution salinity resulting in lower resistivity and higher saturation exponent. However, with solution pH increasing from 4.58 to 9.25, it shows very limited effect on the resistivity and saturation exponent of limestone grains. This can be attributed to the strong buffering ability of limestone. Effects of grain size, solution salinity and pH on the resistivity and saturation exponent of oil‐bearing carbonate sands were investigated. Resistivity is found to show a decreasing trend with increasing grain size from 0.5–1 mm to 3–5 mm above a certain saturation (e.g. Sw > 0.4), while it shows a rapid increase below a certain saturation (e.g., Sw≤$ \le $0.4) for a larger grain size of 3–5 mm. Resistivity decreases and the saturation exponent increases with the increase of solution salinity for oil‐bearing carbonate sands. Resistivity and saturation exponent do not vary significantly with solution pH ranging from 4.58 to 9.25 for oil‐bearing carbonate sands.

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Section: Discussionmentioning

confidence: 99%

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Deng

Qian

Luo

et al. 2022

Near Surface Geophysics

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“…The resistivity of the sediments will be affected by a high clay content in the muddy tidal flat sediments because of the influence of the surface conductivity and pore fluid conductivity (Revil, 2013). The effects of the surface conductivity and R w on the resistivity of the sediments can be separated with a modified version of Archie's law (Equation 3) that was proposed by Nguyen et al (2009) and Shao et al (2021). Therefore, the expected resistivity (R p ) of the sediments at the monitoring points (P1, P2) can be calculated based on R w , as follows:…”

Section: Reliability Analysis Of Inverted Resistivitymentioning

confidence: 99%

The two salinity peaks mode of marine salt supply to coastal underground brine during a single tidal cycle

Xiao,

Zhang,

et al. 2024

Front. Mar. Sci.

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Seawater salt is constantly supplied from the marine environment to coastal underground brine deposits, meaning that brine has the potential for continuous extraction. There is currently a lack of information about the processes that drive the fluxes of seawater salt to underground brine deposits in tidal-driven brine mining areas. We chose the Yangkou salt field on the southern coast of Laizhou Bay, a brine mining area, as our study site. We monitored the spatial and temporal distribution of the underground brine reserve and the changes in water level and salinity in the mining area and adjacent tidal flats using electrical resistivity tomography and hydrogeological measurements. We monitored cross-sections along two survey lines and observed that the underground brine reserve receives a stable supply of seawater salt, and calculated that the rate of influx into the brine body in the mining area near the boundary of the precipitation funnel was 0.226−0.232 t/h. We calculated that a total salt flux of approximately 5.50 t enters the underground brine body every day through a 150 m long shoreline and a 1322.3 m2 window, which is sufficient to sustain the daily extraction of one brine well. During tidal cycles, there are two peaks in the salinity of the water supplied to the underground brine reserve, which means that the brine supply is from at least two high-salinity salt sources in different tidal stages. The first salinity peak occurs during the initial stage of the rising tide after seawater inundates the tidal flat. At this time, seawater, which is a solution and carries a large amount of evaporated salt, is transported into the brine layer through highly permeable areas or biological channels and replenishes the brine in the mining area. The second salinity peak occurs during the early stage of the falling tide. Influenced by hysteresis-driven tidal pumping, high-salinity brine from the lower intertidal zone is rapidly transported into the mining area, thereby increasing the salinity of the underground brine.

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Biogeophysics for Optimized Characterization of Petroleum-Contaminated Sites

Atekwana,

Ohenhen

et al. 2023

Environmental Contamination Remediation and Management

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Oil spills are common occurrences on land and in coastal environments. To remediate oil spills, the contaminated volume has to be defined, appropriate remedial measures should be undertaken, and evidence must be provided for the successful remediation. Geophysical techniques can aid site investigation and remediation efforts. The insulating properties of hydrocarbons make them ideal targets for employing a variety of geophysical techniques for their characterization. Nonetheless, the geophysical response of hydrocarbon-contaminated sites is non-unique and depends on factors such as: (1) the release history, (2) hydrocarbon distribution and partitioning into different phases (vapor, free, dissolved, entrapped, and residual phases) in the unsaturated and saturated zones, (3) seasonal hydrologic processes, (4) extent of biodegradation and (5) aquifer salinity and host lithology. Where the contaminants have been biodegraded, the geophysical response depends on the by-products of different terminal electron acceptor processes (TEAPs). In this chapter, we review the different pathways by which TEAPs mediate geophysical property changes. We provide select field case studies from hydrocarbon-contaminated sites across the globe, including different climatic regimes and water salinity conditions. We show that the geophysical response can be transient, hence, data interpretation should be guided by an understanding of the hydrobiogeochemical processes at each site.

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Quantitative relationship between the resistivity distribution of the by-product plume and the hydrocarbon degradation in an aged hydrocarbon contaminated site

Cited by 16 publications

References 60 publications

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

Effects of grain size, solution salinity and pH on the electrical response of oil‐bearing carbonate sands

The two salinity peaks mode of marine salt supply to coastal underground brine during a single tidal cycle

Biogeophysics for Optimized Characterization of Petroleum-Contaminated Sites

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