Abstract
The article presents the methodology of the representative elementary volume definition for two 1 m long whole core segments. Scientific articles focused on practical methods of representative volume calculations using various physical parameter fluctuations have been studied. Porosity values of every whole core fragment evaluated in two ways using the 7.3 cm diameter core samples in the first approach and the 3 cm diameter core samples in the second one have been compared. Particularities of the scale effect occurring in core samples and depending on core size and porosity type have been analyzed. The cause of porosity increase in big core samples has been determined. The reason due to which porosity changes are explained by fracture porosity occurring in core samples having big volumes has been found. The comparison between neutron log porosity and core porosity has been made. Reasons of similarities or differences of core and log data have been established.
Highlights
The article presents the methodology of the representative elementary volume definition for two 1 m long whole core segments
Porosity values of every whole core fragment evaluated in two ways using the 7.3 cm diameter core samples in the first approach and the 3 cm diameter core samples in the second one have been compared
Particularities of the scale effect occurring in core samples and depending on core size and porosity type have been analyzed
Summary
Изучаемые интервалы керна длиной 1 метр были отобраны из скважины No A месторождения N, относящегося к группе малоэффективных нефтяных месторождений [10]. Скважина No A в интервале глубин 935.0– 1008.0 м вскрывает осадочные отложения среднекаменноугольного возраста. Нижняя часть пройденного интервала (952.0–1008.0 м) представлена породами башкирского яруса. Первый керн длиной 1 м, отобранный в интервале глубин 962.0–963.0 м, представлен грейнстоуном. Второй керн длиной 1 м, извлеченный в интервале глубин 974.0–975.0 м, – грейнстоуном и пакстоуном. Литотипы известняков были установлены в результате микроскопического исследования породколлекторов в шлифах, согласно классификации R.
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