The Potential Applications of Electron Microscopy in Studying the Lithological Characteristics of Oil-Bearing Sandstones

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Abstract

The purpose of the research is to apply a technique for studying of the void space in potentially oil-bearing reservoirs using electron microscopy. Microscopic studies of characteristic areas of the core surface are carried out with an assessment of the void space microstructure, the characteristics of the fragmentary framework grains and filler, and the microstructure of the cementing substance. The surface of the samples is scanned at different magnifications, and microprobe analysis is carried out to diagnose the grains of the detrital framework, filler, cementing and newly formed substances. The relationship between the filtration and capacitance properties of reservoirs and the characteristics of the granulometric composition, void space, composition and structure of cement has been studied. A number of groups have been identified in the Solikamsk Depression reservoirs, for which a regular relationship between productivity and the features of granulometric composition, void space, composition and structure of cement has been established. The first group of reservoirs is characterized by good sorting and dense packing of quartz detrital framework grains, a small amount of filler particles and cementing substance represented by kaolinite with "book-like structure" type. Reservoirs with reduced permeability are characterized by an increased proportion of cementing substance, poor grain sorting due to the presence of a significant amount of filler particles in the detrital framework. A characteristic feature of such a reservoir is a less perfect microstructure of kaolinite of the "book-like structure" type. For the studied siltstones, an mixed-grained granulometric composition, no grain sorting by size, unstructured kaolinite cement with no "book-like structure" type have been established.

Keywords

oil and gas fieldselectron microscopyoil sandstonesporositypermeabilitylithology

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Article information

Published
31 October 2024
Issue date
31 October 2024
Issue
Vol. 24, No. 4 (2024)
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