ESTIMATION OF VOID SPACE STRUCTURE OF ZARICHNA AREA POOR-POROUS ROCKS BASED ON PETROPHYSICAL AND GEOPHYSICAL STUDIES
DOI:
https://doi.org/10.17721/1728-2713.69.08.53-58Keywords:
Reservoir rock, void space structure, petrophysics, geophysical well loggingAbstract
The authors have conducted the investigation of rock samples and well logging data for the layers of Zarichna 3A well (located in Zarichna area of Dnieper-Donets basin) in order to estimate their prospectivity as poor-porous reservoirs of oil and gas on the basis of their void space structure studies. A set of petrophysical studies of gas-, oil- and water-saturated rocks was conducted at the petrophysical lab of the Institute of Geology including investigations under the alternating pressure conditions. Statistical analysis of density, electrical, filtration and storage, acoustic properties was done. Geophysical well logging data interpretation was performed using “Geopoisk” software. The database of well logs included the results of caliper, acoustic, electrical and radioactive logging. Assessment of void space structure on the basis of well logging and petrophysical data was conducted using the original method of inversion of acoustic investigations data into the structure of void space. This method is based on the least square method with use of both nonlinear optimization and conditional moment methods. During the standard analysis of petrophysical and geophysical well logging data total mismatch of conclusions was found: rocks determined as poor-porous reservoirs on the basis of well logging data did not show the same result for the petrophysical studies. Complex analysis of results of the acoustic properties measurements under the alternating pressure conditions made possible the qualitative analysis of rocks' void space structure. Authors have made quantitative assessment of distribution of voids of different formats for the collection of core samples and rock layers. According to the petrophysical investigations data, it was found that void space of studied sandstones almost does not contain fracture-like voids, the void space of organogenic-detrital limestones consists mostly of granular and secondary voids, dolomite limestones include mostly fracturelike voids (0.71% - 0.95%). From the geophysical well logging data it was revealed that among the studied rock layers of well there are four carbonate layers which can be defined as perspective reservoir rocks with high fracture porosity. As a result of complex investigations it was found that studied interval of the well contains compacted poor-porous reservoirs presented mostly by fractured dolomite limestone. The perspective for the future studies of Zarichna area samples and similar areas is to extend current investigations by including anisotropy data which are planned to be measured in the Institute of Geology. The results of this work can be used for the determination of prospectivity of rocks with different lithology and complexity of void space during their petroleum potential studies.
References
Аракчеев Н.Т., Бондарь В.В., Могилевич М.В., (1981). Способ определения пористости трещинно-кавернозных карбонатных пород. А.с. 635843. Бюл. № 11. Arakcheev N.T., Bondar V.V., Mogilevich M.V., (1981). Sposob opredelenija poristosti treshhinno-kavernoznyh karbonatnyh porod. A.s. 635843. Bjul. 11. (In Russian).
Безродна І.М., (2014). Оцінка структури пустотного простору карбонатних порід за результатами акустичних досліджень в умовах змінного тиску. – Вісник НГУ, 3. – С. 21-25. Bezrodna I.M., (2014). Otsinka struktury pustotnoho prostoru karbonatnykh porid za rezultatamy akustychnykh doslidzhen v umovakh zminnoho tysku. – Visnyk NHU, 3. – Р. 21-25. (In Ukrainian).
Безродна І.М., (2013). Прогноз продуктивності порід-колекторів нафти і газу за результатами інверсії акустичних даних ГДС або петрофізки. Нетрадиційні джерела вуглеводнів в Україні (пошуки, розвідка, перспективи): Матер. міжнар. наук. конф. – К. – С. 83-85. Bezrodna I.M., (2013). Prohnoz produktyvnosti porid-kolektoriv nafty i hazu za rezul'tatamy inversiyi akustychnykh danykh HDS abo petrofizky. Netradytsiyni dzherela vuhlevodniv v Ukrayini (poshuky, rozvidka, perspektyvy): Materialy Mizhnarodnoyi naukovoyi konferentsiyi. – Kyiv. – Р. 83-85. (In Ukrainian).
Боярчук А.Ф., Шнурман Г.А., Брайловский А.Л., Гольдерберг И.С., (1987). Способ определения трещинной пористости пород. А.с. 1350643. Бюл. № 41. Bojarchuk A.F., Shnurman G.A., Brajlovskij A.L., Golderberg I.S., (1987). Sposob opredelenija treshhinnoj poristosti porod. A.s. 1350643. Bjul. 41. (In Russian).
Вижва С.А., Безродна І.М. та ін., (2011). Комплексні геологопетрофізичні дослідження складнопобудованих порід-колекторів східного схилу Львівського палеозойського прогину: Звіт з НДР. – К. – 594 с. Vyzhva S.A., Bezrodna I.M. et al., (2011). Kompleksni heolohopetrofizychni doslidzhennya skladnopobudovanykh porid-kolektoriv skhidnoho skhylu Lvivskoho paleozoyskoho prohynu: Zvit z NDR. – Kyiv. – 594 р. (In Ukrainian).
Вижва С.А., Онищук І.І. та ін., (2008). Комплексні детальні петрофізичні та геохімічні дослідження керну інтервалу 3010,0-3022,3 м пошукової свердловини № 3а Зарічної площі: Звіт з НДР. К.
Vyzhva S.A., Onyshchuk I.I. et al., (2008). Kompleksni detalni petrofizychni ta heokhimichni doslidzhennya kernu intervalu 3010,03022,3 m poshukovoyi sverdlovyny № 3a Zarichnoyi ploschi: Zvit z NDR. Kyiv. (In Ukrainian).
Дахнов В.Н., (1975). Геофизические методы определения коллекторских свойств и нефтегазонасыщения горных пород. – М. – 343 с. Dahnov V.N., (1975). Geofizicheskie metody opredelenija kollektorskih svojstv i neftegazonasyschenija gornyh porod. – Moscow. – 343 p. (In Russian).
Добрынин М.М., (1991). Изучение сложных карбонатных коллекторов. – Геология нефти и газа, 5. – С. 30-34. Dobrynin M.M., (1991). Izuchenie slozhnyh karbonatnyh kollektorov. – Geologija nefti i gaza, 5. – Р. 30-34. (In Russian).
Еременко Н.М., Муравьева Ю.А., (2012). Применение методов рентгеновской микротомографии для определения пористости в керне скважин. – Нефтегазовая геология. Теория и практика, 7, 3.
Eremenko N.M., Muravyeva Yu.A., (2012). Primenenie metodov rentgenovskoj mikrotomografii dlja opredelenija poristosti v kerne skvazhin. – Neftegazovaja geologija. Teorija i praktika, 7, 3. (In Russian).
Ивакин Б.Н., Карус Е.В., Кузнецов О.Л., (1978). Акустический метод исследования скважин. – М. – 320 с. Ivakin B.N., Karus E.V., Kuznecov O.L., (1978). Akusticheskij metod issledovanija skvazhin. – Moscow. – 320 p. (In Russian).
Котяхов В.И., (1977). Физика нефтяных и газовых коллекторов. – М. – 287 с. Kotjahov V.I., (1977). Fizika neftjanyh i gazovyh kollektorov. – Moscow. – 287 p. (In Russian).
Лукьянов Э.Е., (1979). Исследование скважин в процессе бурения. – М. – 248 с. Lukyanov Ye.E., (1979). Issledovanie skvazhin v processe burenija. – Moscow. – 248 p. (In Russian). 13. Schön J.H., (2011). Physical properties of rocks. – 494 р.
Downloads
Published
Issue
Section
License
Copyright (c) 2023 Visnyk of Taras Shevchenko National University of Kyiv. Geology

This work is licensed under a Creative Commons Attribution 4.0 International License.
Read the policy here: https://geology.bulletin.knu.ua/licensing




