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Russian Geology and Geophysics

2002 year, number 11

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.