Characterization of Rock Wettability Though Dielectric Measurements

Bona, N.; Rossi, Elio; Venturini, Cesar; Capaccioli, S.; Lucchesi, M.; Rolla, Pierangelo

doi:10.2516/ogst:1998068

Cited by 25 publications

(12 citation statements)

References 19 publications

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“…If the electric field is switched off, the ions return to their initial distribution. This process is controlled by a characteristic relaxation time, which typically takes values between 10 − 4 s and 10 − 8 s (Bona et al, 1998). The dispersion of the dielectrical and electrical quantities of such a single relaxation process can be described by the Debye model (Debye, 1929).…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of permeability and complex resistivity of tight sandstones subjected to hydrostatic pressure

Zisser

Nover

2009

Journal of Applied Geophysics

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Section: Introductionmentioning

confidence: 99%

Anisotropy of permeability and complex resistivity of tight sandstones subjected to hydrostatic pressure

Zisser

Nover

2009

Journal of Applied Geophysics

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“…There are laboratory data on experiments with artificial models of rocks, which testify that in a first approximation their dielectric permeability at megahertz frequencies have components attributed to Maxwell-Wagner polarization (ε MW ) and to transport of unbound ions (ε PL ) [18]. In principle, using analytical formulae for ε MW and ε PL , one may describe the connection between R h and R φ , showed in Figure A-11.…”

Section: Opportunities For Using Deep/shallow Electromagnetic Log Formentioning

confidence: 98%

Experience of Applying Geosteering to Drill Horizontal Wells in Salinization Reservoirs of Eastern Siberia

Chashkov¹,

Gordeev²,

Menyakin³

2011

All Days

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East Siberia is a new and promising centre of oil and gas industry in Russia. Reserves explored in the region amount to ~11 percent of oil, ~14 percent of natural gas, and ~16 percent of gas condensate reserves of Russia. However, East Siberia is currently producing no more than 0.3 percent of Russian oil and about 1 percent of gas [1]. Major causes of such a low production level include remoteness of the region, poorly developed infrastructure, complicated geology, numerous faults, high mineralization of formation water in pay zones, etc.The largest oil-and gas-bearing object of East Siberia is the Vendian terrigenous complex, which transgressively and discordantly overlies the eroded surface of Riphean rock. The complex is represented by the Parfenovskiy Horizon (the Kovykta Field), the Vanavarskaya Suite (the Sobinskoye Field), the Verhnechonskiy Horizon (the Verhnechonskoye Field), the Botuobinskiy Horizon (Srednebotuobinskoye and Chayandinskoye fields), etc. The present publication focuses on our experiences of applying geosteering to drilling in the Verkhnechonskiy Horizon interval of the Verkhnechonskoye oil and gas condensate field.The key specific feature of the Verkhnechonskiy Horizon reservoir is its almost all-round yet very uneven Salinization [2]. Moreover, some of the rock series contain significant volumes of accessory minerals of anomalous physical properties [3].Risks of drilling horizontal wells in poorly productive intervals are significant due to highly abrupt variability of reservoir rocks of the terrigenous complex in interwell space. With application of LWD, it is possible to drill horizontal sections of wells through the most favourable subsurface zones and to obtain reliable determinations of resistance-contrasting boundaries of formations along the entire wellbore [4]. It is generally an adeqaute condition for timely adjustment of well trajectories and for keeping wellbores within target interval boundaries.Geosteering makes it possible to achieve a 10 percent increase in penetrating the best reservoir by horizontal wellbores in comparison with the originally designed wellbores. The average total effect of geosteering in more than 20 wells came to 67 tpd per well. Subject of the StudyThe Verkhnechonskoye Field is located in East Siberia within the Mid-Siberian high plateau boundaries ( Figure A-1). As bulk of the oil reserves is associated with Vc 1 and Vc 2 formations, determination of reservoirs, evaluation of reservoir saturation and quantitative assessment of rock porosity and permeability properties are especially challenging in studies of the Verkhnechonskiy sediments. Therefore, development of new methodological approaches to enhance geological efficiency of various methods applied to studying the profiles of the Verkhnechonskiy sediments should be a priority.In the Verkhnechonskiy Horizon, deposits were formed and sediments were accumuled in submontane and possibly coastdeltoid environment. Diagenetic and catagenetic transformations and metasomatism processes led to high heterog...

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“…On the other hand, spherical water droplets, which are related to MW rocks, will provide lower dielectric strength (Capaccioli et al, 2000). Thus, in comparison to WW rocks, with otherwise identical petrophysical properties, MW rocks have lower permittivity (Bona et al, 1998;Capaccioli et al, 2000;Bona et al, 2001Bona et al, , 2002. Conductivity in WW rocks is also higher than in MW rocks because water in WW rocks can form a continuous conductive path over the surfaces of the grains.…”

Section: Introductionmentioning

confidence: 94%

“…The first three mechanisms are constant within a frequency in the range of 100 Hz-40 MHz. The Maxwell-Wagner-Sillars effect is frequency dependent, and it is dominant in the frequency range of a few MHz to GHz (Sillars, 1937;Bona et al, 1998;Capaccioli et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Dielectric measurements on partially saturated cores may also be sensitive to wettability (Knight and Endres, 1990;Knight and Abad, 1995;Suman and Knight, 1997;Bona et al, 1998Bona et al, , 2001Capaccioli et al, 2000). Attenuation and phase lag of a propagated electromagnetic wave are converted to complex dielectric constant comprising permittivity and conductivity.…”

Section: Introductionmentioning

confidence: 99%

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Indication of wettability from dielectric measurements on partially saturated rocks using effective medium models

et al. 2015

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We used two effective medium models to fit dielectric measurements on a limestone for water-wet (WW) and mixed-wet (MW) cores. The models were based on a bimodal distribution of matrix and hydrocarbon inclusions dispersed in a water host, either as one effective inclusion (bimodal model) or as separate entities (Feng-Sen bimodal). We observed that wettability has a significant effect on the shape factors of the inclusions. These shape factors were the apparent cementation factor in the bimodal and the shape factor for hydrocarbon in the Feng-Sen bimodal. The apparent cementation factor obtained in the bimodal model combined the effects of matrix and hydrocarbon in the water phase tortuosity, and we got higher values for MW than WW rocks of similar pore structure and lithology. It also varied with water saturation. The shape factor for hydrocarbon in the Feng-Sen bimodal model showed how the shape distribution of hydrocarbon affected the water phase tortuosity. It got higher values for MW than WW rocks of similar pore structure and lithology and also varied with water saturation. This variation can be interpreted as a change in the shape of the hydrocarbon ganglion. Because these shape factors are sensitive to water saturation and wettability, we need to be careful when only using them to solely interpret wettability. We expect that this study can be useful in identifying parameters from dielectric measurements that are sensitive to wettability.

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Characterization of Rock Wettability Though Dielectric Measurements

Cited by 25 publications

References 19 publications

Anisotropy of permeability and complex resistivity of tight sandstones subjected to hydrostatic pressure

Anisotropy of permeability and complex resistivity of tight sandstones subjected to hydrostatic pressure

Experience of Applying Geosteering to Drill Horizontal Wells in Salinization Reservoirs of Eastern Siberia

Indication of wettability from dielectric measurements on partially saturated rocks using effective medium models

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