Закономерности изменения фильтрационно-емкостных свойств региональных резервуаров в зависимости от глубины их залегания в юрских отложениях арктических районов Западно-Сибирской и Хатангско-Вилюйской нефтегазоносных провинций

Translated title of the contribution: Common factors of porosity and permeability variations in regional reservoirs depending on depth of their occurrence in the Jurassic series of the Arctic regions of West Siberian and Khatanga-Vilyuisky petroleum provinces

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Abstract

Basing on the analysis of large analytical material, the paper presents the results of studies of reservoir properties and determination of their common factors depending on depth of granular reservoirs occurrence in the regional Jurassic reservoirs of the Arctic regions of West Siberian and Khatanga-Vilyuisky petroleum provinces. Stratigraphic position of Oxfordian, Bathonian, Aalenian-Bajocian, Toarcian, Pliensbachian, and Hettangian-Sinemurian regional reservoirs and their constituent parts (permeable series and impermeables) is discussed. Characteristics of reservoir properties of permeable series in regional reservoirs are presented. Among the regional reservoirs, Oxfordian and Bathonian series have the highest quality; Aalenian-Bajocian and Toarcian reservoirs have the lower quality; Pliensbachian and Hettangian-Sinemurian collectors have the lowest quality. Common features of reservoir quality variations depending on their depth of occurrence are considered. The deeper the reservoirs occur, the lower open porosity and intergranular permeability they possess. Porosity of Jurassic reservoirs decreases with depth by 2 to 2.5 % every 1000 m. Starting from the depth of 4500 m, porosity does not exceed 12-13 %; reservoirs deeper than 5000-5500 m have porosity close to their cutoff. Reservoir permeability decreases from the top down the section from the interval with its medium value (2.68-8.18)·10-3 μm2 at 2000-2550 m to (0.67-0.69)·10-3 μm2 at 4000-4250 m. The cause of reservoir properties worsening depending on depth of their occurrence is explained. Decrease in reservoir properties with depth of occurrence responds to many factors, and rocks compaction because of overburden load is the main of them
Translated title of the contributionCommon factors of porosity and permeability variations in regional reservoirs depending on depth of their occurrence in the Jurassic series of the Arctic regions of West Siberian and Khatanga-Vilyuisky petroleum provinces
Original languageRussian
Pages (from-to)61-71
Number of pages11
JournalГеология нефти и газа
Issue number5
DOIs
Publication statusPublished - 2019

State classification of scientific and technological information

  • 38 GEOLOGY

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