Secondary Dolomitization as a Factor Responsible for the Reservoir Properties of the Lower Devonian Sedimentary Rocks of the Eastern Wall of the Khoreiver Depression (Timan–Pechora Petroleum Basin)

Abstract

The composition, structure, and secondary alteration of the Lower Devonian sedimentary rocks are characterized; the distribution of various types of pore spaces is analyzed and several types of dolomite structures are distinguished. The results of our works indicate that, depending on the permeability, solubility, and primary structure of the carbonate rocks or sediment, as well as the temperature, volume, and duration of influence of dolomitizing fluids, dolomitization can lead to an increase or decrease in porosity.