A laboratory study of complex resistivity spectra for predictions of reservoir properties in clear sands and shaly sands

Li, Junjian; Ke, Shizhen; Yin, Chengfang; Kang, Zhengming; Jiang, Jia; Ma, Xuerui

doi:10.1016/j.petrol.2019.01.061

Cited by 20 publications

(12 citation statements)

References 13 publications

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“…The complex resistivity logging method in frequency domain was based on the dispersion characteristics of complex resistivity of coal and rock (Chen, Zhao and Zhu Khairy and Harith (2011) found the effect of pore geometry, con nement pressure and partial water saturation on coal-rock complex electricity. Li et al (2019) studied the in uence of water content of coal and rock and pear type on the electrical recovery. Binley et al (2005) investigated the complex resistivity response of British sandstone aquifer samples and compared the physical and hydraulic properties with the measured parameters, proving complex resistivity method could be a potential method to evaluate the effect of coal seam hydrofracturing.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on Characteristics of Reactance Dispersion of Water Bearing Coal

Lei

Meng

et al. 2020

Preprint

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As an emerging geophysical exploration method, complex resistivity method is a potential non-invasive one for evaluating hydrofracturing effect. Reactance X is an important parameter of complex resistivity method. Compared with the traditional parameter resistance R, reactance has advantages such as distinct dispersion characteristics, clear conduction mechanism and rich information. In this paper, reactance X of four kinds of coal sample with different water saturation was tested, their dispersion characteristics were analyzed, and their conductive mechanism was studied. The results show that, (1) the characteristic curve of reactance dispersion presents a three-stage law when the water saturation is low, and a two-stage law when the water saturation is high,to some extent, the water content of coal body and the effect of hydraulic fracturing are distinguished;(2) polarization is the cause of dispersion, in which low frequency is induced polarization, high frequency is dielectric polarization, and electromagnetic induction is the interference phenomenon in the frequency band of induced polarization; (3) spectrum extremum frequency point is sensitive to changed water saturation. Extremum points of different coal rank are concentrated in 100-1000Hz. This frequency band can serve as the dominant frequency band for evaluating coal seam water saturation. This paper gives new insight into the evaluation of coal seam hydrofracturing effect by complex resistivity method.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on Characteristics of Reactance Dispersion of Water Bearing Coal

Lei

Meng

et al. 2020

Preprint

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“…We used glass beads to make four groups of artificial sandstone samples and cut them in the form of cylindrical core plugs. As shown in Table 1, the first group of the samples are clean sandstones, and the other three groups are shaly sandstones with different amounts of montmorillonite, kaolinite and illite (Li et al ., 2019). We used NaCl and CaCl 2 solutions with different concentrations (2500 ppm, 10,000 ppm, 100,000 ppm and 200,000 ppm) to saturate the samples, and kerosene was used to flood the solutions under the action of a parallel flow pump to change the water saturation.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies mainly focused on low‐frequency induced polarization exploration, but the geophysical logging needs to focus on the complex resistivity frequency dispersion behaviour in a higher frequency band due to the particularity of the measurement environment. This paper will discuss the factors that influence the frequency exponent of the complex resistivity in the frequency band of 40 Hz–110 MHz based on our published experimental research (Li et al ., 2019) to further clarify the physical significance of this parameter.…”

Section: Introductionmentioning

confidence: 99%

The frequency exponent of artificial sandstone's complex resistivity spectrum

Jiang

Rezaee

et al. 2021

Geophysical Prospecting

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The complex resistivity spectra of 16 artificial sandstone samples with different physical property at different water and solution saturations were measured and fitted with the Cole–Cole model in the frequency band of 40 Hz to 110 MHz. The frequency exponent in the model indicates the ideal degree of the sample's capacitive property. The experimental result shows that the frequency exponents of the samples are concentrated mainly between 0.82 and 0.88 and present a segmented law that decreases first and then increases with decreasing the water saturation. The minimum frequency exponent has a linear relationship with porosity and cementation index and an exponential relationship with formation factors. The frequency exponent is expected to be used in the study of the oil–water distribution in the reservoir. The frequency exponents of the samples decrease with an increase in clay content. Frequency exponents are independent of the ion type in the solution. Numerical simulation results support that the capacitive property generated by the connected pore‐throat spaces is near ideal, but the capacitive property contributed by the closed pore‐throat spaces is non‐ideal. This could be the possible reason why the frequency exponents of the samples are less than one. The pore‐throats with higher capillary pressure can be blocked and become secondary closed pore‐throat space during the flooding process and result in a decrease in frequency exponent. This can explain the influence of reservoir parameters on frequency exponent and can further clarify the physical significance of the Cole–Cole frequency exponent on the rock's complex resistivity.

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“…Pelton et al proposed the Cole-Cole model, and proposed that different minerals can be distinguished by induced polarization effects at multiple frequencies, and then ex-tended it to the second-order Cole-Cole model to describe the low-frequency information of electromagnetic induction [13]. Then Zhu et al studied the Cole-Cole model's ex-tended model Dias model, combined with the damped least square method and the Monte Carlo method based simulated annealing method to reduce the uncertainty of the solution [14]. The research of Ke shizhen believes that the dispersion phenomenon of complex resistance is mainly caused by the polarization of the medium, and improved the Cole-Cole model to include multiple polarization points, and proposed a new interpretation method [15].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Rock Complex Resistivity Using an Inversion Method

Tang¹,

Yu²,

Su³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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The complex resistivity of coal and related rocks contains abundant physical property information, which can be indirectly used to study the lithology and microstructure of these materials. These aspects are closely related to the fluids inside the considered coal rocks, such as gas, water and coalbed methane. In the present analysis, considering different lithological structures, and using the Cole-Cole model, a forward simulation method is used to study different physical parameters such as the zero-frequency resistivity, the polarizability, the relaxation time, and the frequency correlation coefficient. Moreover, using a least square technique, a complex resistivity "inversion" algorithm is written. The comparison of the initial model parameters and those obtained after inversion is used to verify the stability and accuracy of such approach. The method is finally applied to primary-structure coal considered as the experimental sample for complex resistivity measurements.

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A laboratory study of complex resistivity spectra for predictions of reservoir properties in clear sands and shaly sands

Cited by 20 publications

References 13 publications

WITHDRAWN: Experimental Study on Characteristics of Reactance Dispersion of Water Bearing Coal

WITHDRAWN: Experimental Study on Characteristics of Reactance Dispersion of Water Bearing Coal

The frequency exponent of artificial sandstone's complex resistivity spectrum

Simulation of Rock Complex Resistivity Using an Inversion Method

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