The fluid saturation palette development for carbonate deposits of Eastern Siberia using modern core photo processing algorithms

Carbonate reservoirs of Eastern Siberia have a number of specific features and difficulties in studying. This paper pays attention to ambiguity of the fluid saturation definition while working with photographs of a whole core in ultraviolet light. The presence of visual signs of hydrocarbon saturation of selected core samples not always indicates successful testing of exploration wells and obtaining high-flows. Previously using the examples of terrigenous deposits in Eastern Siberia a method was developed to decompose core photos in ultraviolet light into RGB channels, and the dependence of light intensity on the type of hydrocarbon saturation was proven. Using this method the author’s further research focused on the carbonate section. Since carbonate rocks have their own mineral glow, the features of the rock composition and the reasons for the occurrence of different glows are considered. Standard approaches to interpreting photographs of the carbonate core of Eastern Siberia are not applicable. It is necessary to consider multiple options, different shades of glow, in order to identify the prospects of the interlayers of interest. This article examines the carbonate deposits of the Byuks formation in Eastern Siberia. Carbonate rocks can exhibit various types of mineral glow (blue, green, orange) under the influence of ultraviolet radiation. The developed workflow enabled to define the light intensity range of values at which one or another hydrocarbon influx may be received: gas (gas-condensate), oil, mixed saturation in different combination. As a result, the saturation palettes catalog as an additional source of information was obtained.

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