The role of paleohydrochemical factors in groundwater chemistry formation in oil-and-gas-bearing deposits of the northeastern Bol’shekhetskaya Megasyneclise

Abstract

Groundwater chemistry in the northwestern Bol’shekhetskaya Megasyneclise is considered, and the predominance of inversion hydrogeochemical zonality is identified. The analysis of the hydrogeochemistry and genetic coefficients enabled the tentative identification of infiltrogenic, sedimentogenic, lithogenic, and condensatogenic types of waters. The implemented paleohydrogeochemical reconstructions confirmed the predominance in the cross-section of ancient infiltrogenic and slightly saline sedimentogenic water at all development stages of the sedimentary basin.