Study Of Oil Pollution In Mexico With Resistivity Sounding

Shevnin, Vladimir; Ryjov, Albert; Nakamura, E.; Sánchez, A. García; Королев, В. Н.; Mousatov, Aleksandr

doi:10.3997/2214-4609-pdb.191.13esc5

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…Figure 7 shows the results of clean soil samples from oil‐contaminated sites: Campo‐10 at Poza Rica, Veracruz (Shevnin et al . 2003) and Paredon‐31 at Tabasco.…”

Section: Some Practical Examples Of Soil‐resistivity Measurementsmentioning

confidence: 99%

Estimation of clay content in soil based on resistivity modelling and laboratory measurements

Shevnin

Mousatov

Ryjov

et al. 2007

Geophysical Prospecting

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A B S T R A C TThe determination of clay content in near-surface formations is crucial for geotechnical, hydrogeological and oil-contamination studies. We have developed a technique for estimating clay content that consists of the minimization of the difference between the theoretically calculated and measured soil resistivities as a function of water salinity. To calculate the resistivity, we used a model that takes into account the electrochemical processes in the clay micropores. The experimental measurements of soil resistivity were performed on soil samples, completely saturated by brines at different concentrations of NaCl salt in the range 0.6-100 g/l, to obtain the resistivity versus salinity curve. The parameters obtained with this curve inversion are the clay content, the total porosity and the cation exchange capacity. To verify the new technique, we determined clay concentrations of artificial mixtures of calibrated sand and clay. The relative mean error in the clay content does not exceed 20% for a 5% fitting error of the resistivity versus salinity curves. Such evaluations allow the correct separation of the main lithological groups (sand, sandy loam, loam, and light, medium and heavy clay).We applied this technique to estimate the petrophysical parameters of soils (clay content, porosity and cation exchange capacity) at various sites in Mexico. The results improved the interpretation of the vertical electrical soundings, the lithological soil characterization and the delineation of oil-contaminated areas.

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“…Figure 7 shows the results of clean soil samples from oil‐contaminated sites: Campo‐10 at Poza Rica, Veracruz (Shevnin et al . 2003) and Paredon‐31 at Tabasco.…”

Section: Some Practical Examples Of Soil‐resistivity Measurementsmentioning

confidence: 99%

Estimation of clay content in soil based on resistivity modelling and laboratory measurements

Shevnin

Mousatov

Ryjov

et al. 2007

Geophysical Prospecting

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“…Figure 13 shows an industrial-contaminated site, where the presence of mature contamination was evident. An oil-contaminated industrial site was studied using the ERT method [15]. Based on resistivity range, the configuration of the contaminated plumes and the degree of contamination were defined.…”

Section: Determination Of the Aquifer Vulnerabilitymentioning

confidence: 99%

Characterization of Hydrocarbon-Contaminated Sites Based on Geoelectrical Methods of Geophysical Exploration

Delgado‐Rodríguez¹,

Shevnin²,

Guevara³

et al. 2018

Geophysics

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Electrical methods are effective tools for the characterization of oil-contaminated sites and are applied in defining the geometry of the contaminated plume and in designing the remedial process. The optimal methodology integrates geoelectric methods, data processing, and interpretation techniques. Electromagnetic profiling is a reliable and fast method used to provide the configuration of oil-contaminated plume from apparent resistivity map and used to guide the subsequent electrical resistivity tomography survey. From advanced field work methods, data processing, and interpretation procedures, electrical resistivity tomography survey provides the three-dimensional (3D) configuration of the contaminated plume, migration pathways, location of active contaminated sources, and information about lithology. For separate contaminated and clean zones, a petrophysical modeling is used for the calculation of soil resistivity based on groundwater salinity. Taking the pore-water salinity value into account, an inversion algorithm recalculates resistivity maps into maps of clay content, porosity, and cation exchange capacity, allowing a more accurate determination of the volume of contaminated soil. From clay content data, hydraulic conductivity values are calculated for determining the groundwater vulnerability due to vertical migration of contaminants from upper layers. The optimal geoelectric methodology is an efficient procedure to assess hydrocarbon-contaminated sites, with emphasis on large sites with deeper groundwater table.

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“…5 the dependence of resistivity of sand and clay mix is shown at constant concentration of salts (0.1; 0.3; 3 g/l) in aquatic NaCl solution at various percentage of capillaries with parallel connection (М value) and various degree of clay content. The dependences represented in fig.5 were calculated under the formula (8) at the following parameters of sand and clay: for clay Кpclay=0.50, radius of clay pores -r 1 = 0.01 microns; for sand Кps=0.25, radius of sand pores -r 1 = 0.1 mm. Let's note, that at value М=1, all clay is allocated on walls of capillaries, and at М = 0 -is concentrated in clayish corks.…”

Section: Model Of a Capillary -Porous Mediummentioning

confidence: 99%

“…5. In the report (Shevnin, Ryjov et al, 2002), presented at this SAGEEP conference the program "Petrofiz" was used for theoretical calculations of soils' resistivity to separate non-contaminated and contaminated soils, as the properties of the last ones are changed.…”

Section: Possible Ways Of Algorithm Applicationmentioning

confidence: 99%

Theoretic Calculation of Rocks Electrical Resistivity and Some Examples of Algorithm's Application

Ryjov¹,

Shevnin²

2002

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2002

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At calculation of rocks resistivity some statistical formulas are frequently used, the best example is the Archie formula. In the present report calculations of rocks' resistivity are made on the basis of the exact physical-chemical theory. The merit of the exact theory application is that this approach allows understanding more directly the mechanism of rocks resistivity forming and the different factors' influence. The demerit is, that the algorithm requires a good knowledge of physics and chemistry and inputting additional information, which a practical geophysicist not always has. The main stages of rock' resistivity calculation are: electrical conductivity account for electroneutral solutions; calculation of electrical conductivity of a liquid in a double electric layer taking into account the electric properties of the solid phase, then calculation of rock's resistivity for definite lithology, porosity, humidity and grain size. On a series of examples the possibilities of such calculation and the influence of the different factors are shown. Most evidently the algorithm's opportunities are uncovered at resistivity calculation of sandy-clayish sediments. It is possible to use the algorithm at the inverse problem solution for resistivity method-for the estimation of rocks hydro-geological properties on their resistivity.

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Study Of Oil Pollution In Mexico With Resistivity Sounding

Cited by 12 publications

References 12 publications

Estimation of clay content in soil based on resistivity modelling and laboratory measurements

Estimation of clay content in soil based on resistivity modelling and laboratory measurements

Characterization of Hydrocarbon-Contaminated Sites Based on Geoelectrical Methods of Geophysical Exploration

Theoretic Calculation of Rocks Electrical Resistivity and Some Examples of Algorithm's Application

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