Moscow, Russian Federation
VAC 1.6 Науки о Земле и окружающей среде
VAC 2.8.3 Горнопромышленная и нефтегазопромысловая геология, геофизика, маркшейдерское дело и геометрия недр
UDK 552.08 Исследование, определение и измерение пород, их природа и свойства
UDK 552.086 Микроскопические исследования и определения
UDK 552.2 Общая петрография. Классификация горных пород
UDK 552.12 Структура и текстура, размеры и природа составных частей, кристаллическое состояние пород
UDK 616-073.756.8 Послойная рентгенография. Томография
UDK 531.731.43 Измерение пористости
UDK 539.217.1 Пористость
UDK 55 Геология. Геологические и геофизические науки
UDK 550.34 Сейсмология
UDK 550.383 Главное магнитное поле Земли
GRNTI 37.31 Физика Земли
GRNTI 52.00 ГОРНОЕ ДЕЛО
GRNTI 52.47 Разработка нефтяных и газовых месторождений
GRNTI 37.01 Общие вопросы геофизики
GRNTI 37.15 Геомагнетизм и высокие слои атмосферы
GRNTI 37.25 Океанология
GRNTI 38.01 Общие вопросы геологии
GRNTI 36.00 ГЕОДЕЗИЯ. КАРТОГРАФИЯ
GRNTI 37.00 ГЕОФИЗИКА
GRNTI 38.00 ГЕОЛОГИЯ
GRNTI 39.00 ГЕОГРАФИЯ
OKSO 05.06.01 Науки о Земле
OKSO 21.02.01 Разработка и эксплуатация нефтяных и газовых месторождений
OKSO 21.05.05 Физические процессы горного или нефтегазового производства
BBK 26 Науки о Земле
TBK 6335 Геология полезных ископаемых
TBK 6338 Инженерная геология
TBK 63 Науки о Земле. Экология
BISAC JNF037060 Science & Nature / Earth Sciences / Rocks & Minerals
BISAC TEC009150 Civil / Soil & Rock
BISAC SCI SCIENCE
The paper presents the results of non-destructive digital studies of remaining changes in the structural and reservoir volumetric properties of the rocks of the Chayanda oil and gas condensate field as a result of hydraulic fracturing fluid injection. Computed X-ray tomography images were obtained using a high-resolution ProCon X-Ray CT-MINI scanner of the Institute for Problems in Mechanics of the Russian Academy of Sciences. 3D models of the reservoir were created on the basis of the images for digital analysis of the change in reservoir properties after the tests. The structure and relative disposition of rock grains before and after the tests were compared. Local porosity changes in the specimen volume were assessed, including plotting of porosity maps for integral pore space analysis. Pore size distributions were drawn, and conclusions were made about the nature of changes in porometric characteristics of rocks. On the basis of the digital approach the porosity values of rocks were calculated, good agreement with the laboratory measurement data was shown. Changes in porosity distribution over the volume of a specimen of coarse-grained sandstone are described. Uneven distribution of porosity in the specimen after tests is found. Reasons for the described changes in porosity are proposed. It is shown that in the presence of significant heterogeneity of structure and pore space of rocks, the application of traditional methods of reservoir flow properties measurement may be insufficient for accurate characterization of changes in rocks. It is confirmed that the application of nondestructive analysis methods allows to significantly clarify the results of measurements of rock reservoir properties obtained by laboratory method, and in some cases can become an indispensable tool for their correct assessment.
X-ray computed tomography of rocks (CT), porosity, pore space structure, digital core analysis, reservoir capacity properties, porosity distribution
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