Use of tortuosity for discriminating electro-facies to interpret the electrical parameters of carbonate reservoir rocks

Saner, Salih; Al‐Harthi, A. S.; Htay, Maung Than

doi:10.1016/s0920-4105(96)00045-9

Cited by 26 publications

(4 citation statements)

References 3 publications

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“…14). These parameters were close to those given in literature ðm ¼ n ¼ 2Þ (Saner, Al-Harthi, & Htay, 1996). The comparison between different experimental data sets F -F and some predicted models allows us to conclude that the Shell model (for carbonate rock) gives the best fit (Sen, Kenyon, Takezaki, & Petricola, 1997).…”

Section: Electrical Behaviour Versus Reservoir Fabricssupporting

confidence: 87%

High-resolution characterization and integrated study of a reservoir formation: the danian carbonate platform in the Aquitaine Basin (France)

Cérepi

Barde²,

Labat³

2003

Marine and Petroleum Geology

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Section: Electrical Behaviour Versus Reservoir Fabricssupporting

confidence: 87%

High-resolution characterization and integrated study of a reservoir formation: the danian carbonate platform in the Aquitaine Basin (France)

Cérepi

Barde²,

Labat³

2003

Marine and Petroleum Geology

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“…It was found that the application of tortuosity in the resistivity model can achieve better fits with experimental data (Winsauer, ). The literature indicates that the pore characteristics, which are described by porosity, pore size, and interconnection of the pore spaces, are necessary to account for the electrical measurement data (Saner et al, ). Therefore, based on the capillary bundle model, in this section we deduce a new electrical resistivity model.…”

Section: Theoretical Modelmentioning

confidence: 99%

Electrical Resistivity of Freezing Clay: Experimental Study and Theoretical Model

Feng

Chen

2020

JGR Earth Surface

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Electrical resistivity of soil has become one of the most important indicators of compactness and compressive resistance. In previous studies, the temperature of soil tested was always above 0 °C. However, due to the phase change of pore water, the resistivity of freezing soils is different from that of unfrozen soils. Therefore, it is necessary to clarify the influence of temperature on electrical resistivity. To achieve this goal, according to the bundle of the cylindrical capillary model, pores in soil were treated as conducting tubes, and two simple lognormal functions were introduced to describe the distribution of the conducting tubes. Based on the conductivity theory, a new model considering the temperature and the pore size distribution was presented. Results show that only a part of the conducting tubes can be treated as the effective conducting tubes, which are determined by the soil temperature. Furthermore, a small portion of the pores with the smaller size controlled the electrical resistivity of the freezing clay. In other words, the change in the electrical resistivity of freezing clay was caused mainly by the change of unfrozen water content through the decrease in temperature. Based on the experimental results conducted on clay from Northeast China, the validity of the presented model was verified. The comparison results indicate that there was a good agreement between the calculated results and the experimental results. To expand the scope of the model, more laboratory tests are suggested to conduct to verify the applicability of the model to other clays.

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“…Consequently, it is essential to have a quantitative understanding of tortuosity in porous media to improve fluid flow modeling. Electrical and diffusion tortuosity are among the most widely used quantities for describing the pore geometry complexity which is important for transport modeling (Duda et al., 2011; Elsayed, BinGhanim, et al., 2022; Honari et al., 2013; Patel et al., 2016; Saner et al., 1996). The electrical tortuosity is based on the electrical resistivity measurements in which the formation resistivity factor ( F ) is evaluated (Pérez‐Rosales, 1982; Revil et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Clay and Fluid Conductivity on the Electrical‐Diffusion Tortuosity Correlations in Sandstone Reservoirs

Elsayed,

El‐Husseiny,

Kwak

et al. 2024

Water Resources Research

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Tortuosity has different definitions that are used by scientists and engineers to describe various fluid‐related processes in porous media. Two of the most commonly used definitions are electrical (describing the electrical current flow process) and diffusion (related to the molecular diffusive flow process) tortuosity. In this study, we investigate the impact of minerology (presence of clay) and fluid conductivity on the electrical‐diffusion tortuosity relationship. That is: whether or not electrical and diffusion tortuosity have one‐to‐one relationship in sandstones. Two groups of samples were used: clean Fontainebleau sandstones and clayey sandstones. Electrical resistivity was measured using four‐electrode method to obtain electrical formation factor and calculate the electrical tortuosity (τe) using a model that is applicable for consolidated rocks. Pulsed field gradient nuclear magnetic resonance (PFG NMR) measurements were employed to quantify diffusion tortuosity (τD). At lower fluid conductivity (3 S/m), our results show that τD ≈τe for clean sandstones, while τe << τD is observed for clayey sandstones. We propose that mineralogy has direct impact on the τe−τD relationship: the presence of clay minerals added surface conductivity which contributed to underestimating the intrinsic formation factor (F′) and consequently reducing τe. As the fluid conductivity increases, τe converges to τD until reaching the high salinity limit at which F′ is obtained and τD becomes in good agreement with τe for the clayey sandstone. The NMR diffusion approach presented here shows the potential of estimating F′ without the need for multi‐salinity data which can contribute to improved permeability prediction.

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Use of tortuosity for discriminating electro-facies to interpret the electrical parameters of carbonate reservoir rocks

Cited by 26 publications

References 3 publications

High-resolution characterization and integrated study of a reservoir formation: the danian carbonate platform in the Aquitaine Basin (France)

High-resolution characterization and integrated study of a reservoir formation: the danian carbonate platform in the Aquitaine Basin (France)

Electrical Resistivity of Freezing Clay: Experimental Study and Theoretical Model

The Impact of Clay and Fluid Conductivity on the Electrical‐Diffusion Tortuosity Correlations in Sandstone Reservoirs

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