TY - JOUR

T1 - Oil and gas hydrogeochemistry of the prejurassic deposits in the southern areas of Obirtysh interfluves

AU - Novikov, Dmitry A.

AU - Ryzhkova, Svetlana V.

AU - Dultsev, Fedor F.

AU - Chernykh, Anatoliy V.

AU - Ses, Ksenia V.

AU - Efimtsev, Nikolay A.

AU - Shokhin, Andrey E.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The relevance of the research is in solving the fundamental and applied problems of hydrogeology and hydrogeochemistry of the pre Jurassic basement of the West Siberian artesian basin and is of great importance for studying the crust of the platforms and folded belts in general. The uniqueness and complexity of the facility lies in the fact that the West Siberian basin is the largest section of the young platform, under the cover of which the complexes with different age and different geodynamical and hydrogeological characteristics are articulated. Scientific generalizations of the available factual data have not been conducted for more than 30 years! In addition, the relevance of the research is to assess the current state of the waterpressure systems of the preJurassic complexes, and in developing the hydrogeological criteria for their oil and gas content and refinement of the search and exploration of hydrocarbons in the preJuras sic base of Western Siberia. The aim of the research is to reveal chemical and gas compound of groundwaters and brines of the preJurassic complexes, to establish the possible genetic types of groundwaters and brines and their spatial distribution; to assess the metamorphic degree of brines in com parison with a hydrogeochemical standards of Siberia. Methods: using the methods of V.A. Sulin, A.A. Kartsev, S.L. Shvartsev, N.M. Kruglikov, V.V. Nelyubin, O.N. Yakovlev, V.M. Matusevich and other researchers to identify the features of geochemistry of groundwater and brines, to establish the genetic type of groundwater and brines, by using the ratiocoefficient of marco and mircocompounds such as: Na/rCl, Сl/Br, Ca/Cl, r (HCO 3 +CO 3 )/r (Ca+Mg), B/Br, Br/Cl10 –3 , Sr/Cl10 –3 and others. Using the integratedcoefficient S (by S.L. Shvartsev) and ratio of Ca/Cl, Br/Cl10 –3 , Sr/Cl10 –3 to estimate the degree of metamorphism of brines. Results. The paper introduces the geochemical studies of groundwaters and brines of the preJurassic sediments in the southern regions of the ObIrtysh interfluve. It is established that underground waters and brines with a total mineralization of 4 to 100 g/dm 3 of ClNa, ClNaCa and ClHCO 3 Na composition are developed in the region, with dominance of the first type. Carrying out a retrospective of hy drogeological history and a detailed analysis of hydrogeochemical data it is possible to assume the dominance of sedimentogenic brines in the section and the presence of lithogenic (thermodegradation), ancient infiltrogenic and condensate waters. A combined considera tion of the ratiocoefficient (rNa/rCl, Ca/Cl, Br/Cl10 –3 , Sr/Cl10 –3 ) with the integrated indicator of brines metamorphism (S) confirms that in this area the brines are at the initial stage of metamorphism of the chemical composition.

AB - The relevance of the research is in solving the fundamental and applied problems of hydrogeology and hydrogeochemistry of the pre Jurassic basement of the West Siberian artesian basin and is of great importance for studying the crust of the platforms and folded belts in general. The uniqueness and complexity of the facility lies in the fact that the West Siberian basin is the largest section of the young platform, under the cover of which the complexes with different age and different geodynamical and hydrogeological characteristics are articulated. Scientific generalizations of the available factual data have not been conducted for more than 30 years! In addition, the relevance of the research is to assess the current state of the waterpressure systems of the preJurassic complexes, and in developing the hydrogeological criteria for their oil and gas content and refinement of the search and exploration of hydrocarbons in the preJuras sic base of Western Siberia. The aim of the research is to reveal chemical and gas compound of groundwaters and brines of the preJurassic complexes, to establish the possible genetic types of groundwaters and brines and their spatial distribution; to assess the metamorphic degree of brines in com parison with a hydrogeochemical standards of Siberia. Methods: using the methods of V.A. Sulin, A.A. Kartsev, S.L. Shvartsev, N.M. Kruglikov, V.V. Nelyubin, O.N. Yakovlev, V.M. Matusevich and other researchers to identify the features of geochemistry of groundwater and brines, to establish the genetic type of groundwater and brines, by using the ratiocoefficient of marco and mircocompounds such as: Na/rCl, Сl/Br, Ca/Cl, r (HCO 3 +CO 3 )/r (Ca+Mg), B/Br, Br/Cl10 –3 , Sr/Cl10 –3 and others. Using the integratedcoefficient S (by S.L. Shvartsev) and ratio of Ca/Cl, Br/Cl10 –3 , Sr/Cl10 –3 to estimate the degree of metamorphism of brines. Results. The paper introduces the geochemical studies of groundwaters and brines of the preJurassic sediments in the southern regions of the ObIrtysh interfluve. It is established that underground waters and brines with a total mineralization of 4 to 100 g/dm 3 of ClNa, ClNaCa and ClHCO 3 Na composition are developed in the region, with dominance of the first type. Carrying out a retrospective of hy drogeological history and a detailed analysis of hydrogeochemical data it is possible to assume the dominance of sedimentogenic brines in the section and the presence of lithogenic (thermodegradation), ancient infiltrogenic and condensate waters. A combined considera tion of the ratiocoefficient (rNa/rCl, Ca/Cl, Br/Cl10 –3 , Sr/Cl10 –3 ) with the integrated indicator of brines metamorphism (S) confirms that in this area the brines are at the initial stage of metamorphism of the chemical composition.

KW - Brine

KW - Genetic type

KW - Metamorphism degree

KW - ObIrtysh interfluve

KW - Oil and gas hydrogeochemistry

KW - Western Siberia

KW - Oil and gas hydrogeochemistry

KW - brine

KW - genetic type

KW - metamorphism degree

KW - Ob-Irtysh interfluve

KW - Western Siberia

KW - FORMATION WATERS

KW - BASIN

KW - ORIGIN

KW - IDENTIFICATION

KW - GROUNDWATER

KW - EVOLUTION

UR - http://www.scopus.com/inward/record.url?scp=85061702422&partnerID=8YFLogxK

U2 - 10.18799/24131830/2018/12/19

DO - 10.18799/24131830/2018/12/19

M3 - Article

AN - SCOPUS:85061702422

VL - 329

SP - 39

EP - 54

JO - Известия Томского политехнического университета. Инжиниринг георесурсов

JF - Известия Томского политехнического университета. Инжиниринг георесурсов

SN - 2500-1019

IS - 12

ER -