RECOGNITION OF ZONES OF CATAGENETIC CEMENTATION IN CARBONATE ROCKS OF THE KARACHAGANAK HYDROCARBON DEPOSIT FROM DEFECTS OF CRYSTALLINE STRUCTURE OF CALCITE
A. V. Peskov and V. V. Gusev
Keywords: Limestone calcites, catagenesis, hydro-carbons, crystal structure, carbonate reservoirs, Karachaganak deposit
Pages: 1009-1016
Abstract
Study was given to the lithology of carbonate reservoirs of the Karachaganak oil and gas-condensate deposit (KOGCD). 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 re-efogenic ones, can be subdivided into zones with different degrees of catagenetic transformation and different reservoir properties.
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