Facies control of the reservoir properties distribution in the carbonate rocks of epicontinental platforms

Background: It is difficult to imagine the modern world without hydrocarbon raw materials. Oil and gas production is not only the basis of a powerful fuel and energy complex but also the main source of foreign exchange earnings and a leading component of the budget for many countries. Carbonate rocks strike the imagination by their diversity, but at the same time they cause many problems: they are extremely variable from the point of view of reservoirs. The main problems of productive carbonate members are heterogeneity; distribution of reservoirs in the form of lenses with different configurations and strikes as well as hydrodynamic connections between the lenses is often chaotic. All of the listed problems of carbonate reservoirs are associated with secondary processes.

Aim: The project aims to assess the reservoir properties of carbonate rocks from the point of view of facies zoning on the example of Ovinparm rocks.

Materials and methods: In this work, we used: rock material from 8 wells (475 m), 14 wells with hydrodynamic data and a 3D seismic cube.

Results: Based on the data obtained, the principles of facies diagnostics of the epicontinental platform deposits of were developed, facies of epicontinental platforms were identified, rock material was linked to logging data, a facies model and a facies map were built, a sequence stratigraphic analysis was carried out, and the regularity of the selective nature of the manifestation of secondary processes depending on the characteristics of the conditions for the accumulation of facies of epicontinental platforms was revealed, promising zones were identified taking into account the facies zoning and the intensity of the passage of secondary processes in the study area.

Conclusion: By understanding how the reservoir properties are related to carbonate depositional conditions, we can predict the most interesting zones and determine the main secondary processes leading to such improved or degraded reservoir properties.