Estimation of Moscovian Stage West-Shebelynska Area Clastic Sedimentary Rock Reservoir Properties Using Laboratory Petrophysical Data

Bezrodna, I.; Antoniuk, V.

doi:10.17721/1728-2713.81.05

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Західно-Шебелинська площа свердловина 701-Біс (інтервал глибин 4929-5380 м). За даними буріння та статистичного аналізу властивостей зразків керна авторами попередньо було виділено інтервали порід з колекторськими властивостями (4940-4943 та 5202-5211 м) [4]. Попередні дослідження в ННІ «Інститут геології» [12] довели, що виділені породи представлені низькопористими (<10 %) та слабкопроникними (<1 мД) пісковиками з шаруватою текстурою з прошарками слюдистих та глинистих мінералів, а також вуглистої речовини.…”

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Analysis of filtration and electrical properties anisotropy of terrigenous reservoir rocks (for DDB axial zone reservoirs)

Bezrodna¹,

Antoniuk²,

Олійник³

2019

Visnyk of V.N. Karazin Kharkiv National University, Series Geology. Geography. Ecology

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The paper focuses on the filtration and electrical anisotropy coefficients and relationship between vertical and horizontal permeability in sandstone reservoir rocks. Field case study of DDB reservoir rocks. Petrophysical properties and parameters are estimated from core and log data from a Moscovian and Serpukhovian stages of Dnipro-Donetsk Basin (West-Shebelynka area well 701-Bis and South-Kolomak area well 31). Routine core analysis included estimation of absolute permeability, open porosity, irreducible water saturation and electrical resistivity (on dry and saturated by mineralized solution) of 40 core samples along two orthogonal directions. Shale fraction is estimated using well logging data in wells which are analyzed. The authors report that reservoir rocks are represented by compacted poor-porous (φ <10 %), low permeable (k<1mD) laminated sandstone with different ratios of clay minerals (Vsh from 0,03 to 0,7) and high volume of micaceous minerals (in some cases 20-30 %). Research theory. One of the main objectives of the work is to develop empirical correlation between vertical permeability and other capacitive and filtration properties for compacted sandstone reservoirs. A modified Kozeny-Carman equation and the concept of hydraulic average radius form the basis for the technique. Results. Coefficients of the anisotropy of gas permeability (IA) and electrical resistivity (λ) are defined based on the results of petrophysical studies. The experiments proved that IA lies in a range from 0,49 to 5 and λ from 0,77 to 1,06. Permeability and electrical resistivity anisotropy in most cases have horizontal distribution. It has been shown that in West-Shebelynka area sample №1 (depth 4933 m) there is probably no fluids flow in vertical direction and in samples №№3 and 15 fractures have the vertical orientation. We have also found that the values of electrical and filtration anisotropy for all samples of South-Kolomak area are similar, this characterized the unidirectionality in their filtration properties, as well as the fact that the motion of the fluid flow mainly in the horizontal direction. In the studied rocks the degree of anisotropy has been concluded to depend on the volume of clay and micaceous minerals, their stratification, fractures, density, and their orientation. New correlation between vertical permeability, horizontal permeability and effective porosity are developed for Late Carboniferous DDB intervals that are analyzed.

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Analysis of filtration and electrical properties anisotropy of terrigenous reservoir rocks (for DDB axial zone reservoirs)

Bezrodna¹,

Antoniuk²,

Олійник³

2019

Visnyk of V.N. Karazin Kharkiv National University, Series Geology. Geography. Ecology

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Modelling of the Effects of Fluid Substitution in the Visean Deposits of the Yablunivske Field Based on the Interpretation of Well Logging Data and Petrophysics

Yemets¹,

Bezrodna²,

Antoniuk³

2023

VKNUGEOL

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The paper discusses the details of the application of the method of fluid substitution which is used for predicting elastic properties of reservoir rocks and their dependence on pore fluid and porosity. This method makes it possible to predict changes in elastic response of a rock saturation with different fluids. The main task of this paper was to study the productive zones of the visean deposits of the Yablunivske field using the example of a single well. The integration of petrophysics and rock physics (Gassmann fluid substitution) was applied to sandstones with intergranular porosity. The objective of the study was to use petrophysical dependences, cross-plots and Gassmann fluid substitution modelling to determine the effect of different pore fluids (brine, oil, gas) on acoustic properties (compressional velocity, shear velocity, density). It was established that the sandstone is a predominant type of reservoir of the considered rocks. The effect of fluid substitution on elastic properties was determined as a result of the implementation of Gasman's technique. The compressional velocity and density decreased, shear velocity slightly increased when brine was substituted with gas for the formed models. Limit values of acoustic impedance and Vp/Vs have been established for the water saturated and hydrocarbon saturated strata of the V-20 – V-22 horizons. It can be used for the drilling new wells of the Yablunivske field creating elastic reservoir rock models.

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Estimation of Moscovian Stage West-Shebelynska Area Clastic Sedimentary Rock Reservoir Properties Using Laboratory Petrophysical Data

Cited by 2 publications

References 3 publications

Analysis of filtration and electrical properties anisotropy of terrigenous reservoir rocks (for DDB axial zone reservoirs)

Analysis of filtration and electrical properties anisotropy of terrigenous reservoir rocks (for DDB axial zone reservoirs)

Modelling of the Effects of Fluid Substitution in the Visean Deposits of the Yablunivske Field Based on the Interpretation of Well Logging Data and Petrophysics

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