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Russian Geology and Geophysics

2004 year, number 8

THE NATURE OF VERTICAL HYDROGEOCHEMICAL ZONING OF PETROLEUM DEPOSITS (exemplified by the Nadym-Taz interfluve, West Siberia)

S.L. Shvartsev and D.A. Novikov
Tomsk Affiliate of Institute of Petroleum Geology, Siberian Branch of RAS,
3 prosp. Akademichesky, Tomsk, 634021, Russia
Keywords: Underground waters, chemical composition, oil hydrogeology, vertical hydrogeochemical zoning, water genesis, composition formation, hydrogeochemistry
Pages: 960-972

Abstract

Geochemistry of underground waters of petroliferous deposits was studied in a vast region with different types of vertical hydrogeochemical zoning. It has been shown that the zoning nature is governed by two main factors: the genetic type of underground waters and character of water interaction with rocks and organic matter, which are, in turn, the products of the geologic history of the region. According to genesis, the groundwaters are divided into four types: (1) connate Jurassic, (2) connate from the Paleozoic basement, (3) ancient infiltrated, and (4) condensation-related. The chemical composition of each of these types of water is considerably modified by water interaction with rocks, gases, and organic matter, as well as by mixing with waters of other genetic types. Different successions of genetic types of waters subjected to different grade metamorphism and mixing at depth are responsible for the character of direct, inverse, or more intricate hydrogeochemical zoning in the region.