Petrophysical Features of Maikop Series of the Crimean-Black Sea Region

Self Cite

The main objective of this article is to highlight the results of investigations of filtration capacity features of sandstones and argillites of the Upper Carbon rocks in Runovshchynska area of The Dnieper-Donets basin. The purpose of the research was to assess the promising rocks as possible hydrocarbon reservoirs. The following reservoir features of rock samples such as the open porosity factor, permeability coefficients and residual water saturation factor have been investigated. The correlation of rock density with their porosity was also studied. The porosity study was carried out in atmospheric and reservoir conditions by gas volumetric method and fluid saturation. The bulk density of dry rock samples varies from 2,122 kg/m3 to 2,615 kg/m3 (average 2318 kg/m3), saturated rocks – from 2265 to 2680 kg/m3 (average 2449 kg/m3), and the specific matrix density – from 2562 to 2786 kg/m3 (average 2650 kg/m3). The open porosity coefficient of the studied rocks, in case they were saturated with the synthetic brine, varies from 0.058 to 0.190 (mean 0.126), but if they were saturated with N2 it varies from 0.066 to 0.203 (mean 0.145). Detailed analysis of reservoir conditions modeling revealed that porosity coefficient varies from 0.038 to 0.175 (mean 0.110). Due to the closure of microcracks under rock loading reduced to reservoir conditions the porosity decreases in comparison with atmospheric conditions, which causes a relative decrease in the porosity coefficient from 4.5% to 13.8% (mean 9.0%) from atmospheric conditions to reservoir conditions. The permeability coefficient of rocks varies from 0.03 fm2 to 240.57 fm2 (mean 11.87 fm2). The residual water saturation factor of rocks varies from 0.02 to 0.89 (mean 0.36). The classification of the reservoir characteristics of the investigated samples by the permeability coefficients and residual water saturation factors has been fulfilled. The correlation analysis has allowed establishing a series of empirical relationships between the reservoir parameters of the studied rocks (density, porosity coefficient, permeability coefficient and residual water saturation factor). The results of complex petrophysical researches indicated that the promising oil-bearing intervals of the horizons G-6, G-7v, G-7n have, in general increased values of reservoir parameters.

“…Kyiv-Lviv: UkrDHRI. [in Ukrainian] Vyzhva, S, Onyshchuk, I. et al (2017). Complex analytical laboratory researches of core samples of Runovshchynska area wells.…”

Section: Referencementioning

confidence: 99%

Reservoir Features of the Upper Carbon Sediments (Runovshchynska Area of the Dnieper-Donets Basin)

Vyzhva

Onyshchuk

et al. 2018

Self Cite

“…Аналіз публікацій за темою досліджень. Вивченню фізичних властивостей порід нафтогазоперспективних районів України присвячена низка публікацій (Вижва та ін., 2012, 2016Vyzhva et al, 2017Карпенко та ін., 2014, 2015Маслов та ін., 2017;Михайлов та ін., 2014а, б, 2015Нестеренко, 2010;Орлюк та ін., 2001, 2011, 2013Orlyuk et al, 2018а, б;Рибалка та Карпенко, 2016;Соболь та Карпенко, 2021;Старостенко та Русаков, 2015;Федоришин, 2018 та ін. ) та багатьох інших авторів.…”

unclassified

Reservoir Properties of Consolidated Terrigenous Rocks of Cambrian Period of the Eastern Slope of the Lviv Paleozoic Depression

Vyzhva¹,

Onyshchuk²,

Onyshchuk³

et al. 2022

Self Cite

The paper concerned the researches of porosity and permeability properties of consolidated terrigenous reservoir rocks of Cambrian period of the Eastern slope of the Lviv depression. The purpose of the research was to study the petrophysical parameters of the consolidated reservoir rocks, as the basis of the integrated analysis of their physical properties. Such reservoir parameters as the open porosity factor and void factor, permeability coefficient and residual water saturation factor have been studied. The article presents the limits of changes and the average values of porosity and permeability properties of rocks, and the classification of their reservoir properties. On the basis of capillarimetric research, an evaluation of the structure of the void space of rocks was made. The correlation analysis has allowed to establish a series of empirical relationships between the reservoir parameters (density, porosity coefficient, effective porosity factor and residual water saturation factor) and, also, to determine correlation dependences between porosity coefficients measured in atmospheric and reservoir conditions. These relationships can be used in the data interpretation of geophysical studies of wells and in the modeling of porosity and permeability properties of consolidated rocks of the Eastern slope of the Lviv depression.

Electric and Elastic Properties of Consolidated Terrigenous Rocks of Cambrian Period of the Southern Slope of the Lviv Palaeozoic Trough

Vyzhva,

Onyshchuk,

Onyshchuk

et al. 2023

Paper concerned the research of elastic and electric properties of consolidated terrigenous rocks of Cambrian period of the southern slope of the Lviv Palaeozoic trough. The purpose of the research was to study the petrophysical parameters of the consolidated reservoir rocks (siltstones and sandstones), as the basis of the integrated analysis of their physical properties. The research looked at electric and elastic parameters of terrigenous rock samples, resistivity and formation resistivity factor, formation resistivity enlargement factor, velocities of the P-waves and interval (transit) time in atmospheric and reservoir conditions. Correlations between resistivity and formation resistivity factor, and between porosity and formation resistivity factor of consolidated rocks were established in atmospheric and reservoir conditions. The correlation between the resistivity and formation resistivity factor manifest itself in linear function. Physical modeling of reservoir conditions allows adapting the values of electrical parameters obtained in atmospheric conditions to parameters of rocks in reservoir conditions. Laboratory acoustic study of rock samples managed to establish correlations of: velocities of the P-waves and interval (transit) time with density and porosity in atmospheric conditions; velocities of the P-waves in atmospheric and reservoir conditions; velocities with porosity in reservoir conditions. The correlations between velocities of the P-waves in atmospheric and reservoir conditions for the studied rocks manifested itself in linear function. Physical modeling of reservoir conditions allows adapting the values of elastic parameters obtained in atmospheric conditions to parameters of rocks in reservoir conditions. The correlations between the electric and elastic properties and reservoir properties of siltstones and consolidated sandstones should be at the basis of preliminary interpretation of geophysical well logging on prospective areas of the southern slope of the Lviv Palaeozoic trough.