The lithology of carbonate reservoirs of the Karachaganak oil and gas-condensate deposit (KOGCD) was studied. The calcites from the KOGCD limestones were explored to reveal crystal-structure imperfections (CSI), whose parameters were estimated to a different degree of catagenetic transformation. Using the X-ray structural analysis, we can determine the amount of catagenetic calcite. Using the X-ray approximation, we have established zones of catagenetic cementation in the limestones of the Karachaganak hydrocarbon deposit. According to CSI parameters, the compositionally uniform carbonate formations, especially of reef origin, can be subdivided into zones with different degree of catagenetic transformation and different reservoir properties.

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