«Proceedings of Gubkin University»

Analysis of structural changes in hydrocarbon reservoirs using X-Ray CT scanning methods

UDC: 622.276.1:550.837+622.279
DOI: -

Authors:

¹ Ishlinsky Institute for Problems in Mechanics RAS, Moscow, Russian Federation

Keywords: internal reservoir structure, fractional composition, granulometry analysis, inhomogeneities of matrix composition, digital core analysis, X-Ray computed tomography (CT), structural properties of rocks, displacement of matrix grains

Annotation:

The article presents studies of changes in the internal structure of the reservoir of the Chayandinskoye oil and gas condensate field (OGCF) using non-destructive computed tomography (CT) methods after hydromechanical testing of core material under baric conditions. Digital CT image analysis included the examination of fracturing, cavitation, matrix heterogeneity, impurity content, and changes in the fractional composition of the rock. Based on multi-scale computed tomography images, a comparison was conducted on the changes in the spatial arrangement of grains in the rock matrix, crack formation, and macroscopic variations in pore space. Through segmentation, 3D models of the internal rock structure and the geometry of impurity distribution in the matrix composition were created. The study analyzed changes in the quantity of metallic and mineral substances within the rock samples. Digital granulometric analysis of the collector matrix was performed, and histograms of grain size distribution were constructed. The results showed no significant macroscopic structural changes for the two types of rocks. The article also describes the nature of changes in the fractional composition of rocks following testing and proposes the possible causes of the observed changes. Structural characteristics of the rock, obtained using a digital approach, provide valuable data for creating and refining reservoir models. The results of the study can be applied to solve issues related to the destruction and deformation of rocks under reservoir impact conditions. The combined use of these results with those obtained through conventional laboratory methods and mechanical testing aims to improve existing approaches to the comprehensive analysis of core material.

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