Features of filling productive hydrocarbon deposits in the south of the East Siberian platform

Abstract

The relevance of the research lies in the need to replenish the resource base of hydrocarbons in Russia through the development of deposits in the southern part of the East Siberian. Productive horizons in the area are characterized by increased non-uniformity, which is largely due to post-sedimentation processes. The aim of the work is to study the results of the development of halitization processes (epigenetic filling of the void space of rocks with halite). The material for the study was the data of lithological and petrophysical studies of the core, on the basis of which a statistical analysis of saline rocks was performed and the relations between reservoir properties and halite content in the paleovoids for productive horizons were constructed. Filling the void space with secondary halite has not only a negative impact on the reservoir properties of rocks, but also negatively affects the process of developing deposits. Injection of fresh water into the reservoir will cause the beginning of dissolution of salt crystals, the development of which is accompanied by the release of a large amount of heat, which in turn will entail intensive deposition of calcite crystals in the void space, since carbonate waters are widespread in the formation. As a result, the reservoir properties of productive rocks will deteriorate up to the isolation of a number of oil and gas-saturated bodies from the main drainage system of productive horizons, which will negatively affect the oil recovery coefficient and, consequently, the efficiency of the development of hydrocarbon deposits.

Keywords

• salinization
• reservoir properties
• void
• oil development
• gas development
• postsedimentation