FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA

Climate warming can be caused by global changes due to emissions of the greenhouse gases, which are mainly carbon dioxide and methane. Although vertical migration of hydrocarbons (seepages) to the surface from oil and gas fields has been known for many years, this important environmental factor has...

Full description

Bibliographic Details
Main Authors: A. N. Kurchatova, V. V. Rogov
Format: Article
Language:Russian
Published: Nauka 2018-05-01
Series:Лëд и снег
Subjects:
Online Access:https://ice-snow.igras.ru/jour/article/view/455
_version_ 1797878152868921344
author A. N. Kurchatova
V. V. Rogov
author_facet A. N. Kurchatova
V. V. Rogov
author_sort A. N. Kurchatova
collection DOAJ
description Climate warming can be caused by global changes due to emissions of the greenhouse gases, which are mainly carbon dioxide and methane. Although vertical migration of hydrocarbons (seepages) to the surface from oil and gas fields has been known for many years, this important environmental factor has not yet received due attention in the study of the Arctic and Subarctic regions. The major hydrocarbon-induced chemical and mineralogical changes within the permafrost stratum were investigated in the south of theTazPeninsulainWestern Siberia. The samples of frozen core from the deep (35 m) hole, which had been drilled from the top of hydrolaccolite, were examined to analyze the cryogenic texture of the frozen rock mass, to estimate the gas content in rock and ice, and to determine the authigenous mineral association using SEM and EDX spectroscopy analysis. It is shown that the migration of hydrocarbon gases through the permafrost stratum is caused by shear deformations with the formation of cryogenic crack-type textures on the sliding surfaces, which are characterized by the presence of gas-saturated ice crystallites and high jointing of quartz. It has been established that the migration of hydrocarbons, primarily methane, frozen in sedimentary strata causes significant changes of the pH/Eh parameters: local anaerobic conditions may be changed by microaerophilic ones through the formation of oxygen during crystallization of the water in the slide area; mainly neutral and weakly acidic conditions can locally be changed by the alkaline ones due to the cryogenic concentration of chlorides during freezing. It was found that the impulse character of hydrocarbon migration in permeation zones of frozen strata causes mosaic distribution of sulfate and iron reduction processes, which control the neogenesis (including as a result of microbiological processes) of various forms of iron compounds: sulfides – carbonates oxides.
first_indexed 2024-04-10T02:28:13Z
format Article
id doaj.art-6ee2109b791544e58319a26906cacb53
institution Directory Open Access Journal
issn 2076-6734
2412-3765
language Russian
last_indexed 2024-04-10T02:28:13Z
publishDate 2018-05-01
publisher Nauka
record_format Article
series Лëд и снег
spelling doaj.art-6ee2109b791544e58319a26906cacb532023-03-13T08:01:19ZrusNaukaЛëд и снег2076-67342412-37652018-05-0158219921210.15356/2076-6734-2018-2-199-212367FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIAA. N. Kurchatova0V. V. Rogov1Институт криосферы Земли Тюменского научного центра СО РАН; Тюменский индустриальный университетИнститут криосферы Земли Тюменского научного центра СО РАН; Московский государственный университет имени М.В. Ломоносова; Тюменский государственный университетClimate warming can be caused by global changes due to emissions of the greenhouse gases, which are mainly carbon dioxide and methane. Although vertical migration of hydrocarbons (seepages) to the surface from oil and gas fields has been known for many years, this important environmental factor has not yet received due attention in the study of the Arctic and Subarctic regions. The major hydrocarbon-induced chemical and mineralogical changes within the permafrost stratum were investigated in the south of theTazPeninsulainWestern Siberia. The samples of frozen core from the deep (35 m) hole, which had been drilled from the top of hydrolaccolite, were examined to analyze the cryogenic texture of the frozen rock mass, to estimate the gas content in rock and ice, and to determine the authigenous mineral association using SEM and EDX spectroscopy analysis. It is shown that the migration of hydrocarbon gases through the permafrost stratum is caused by shear deformations with the formation of cryogenic crack-type textures on the sliding surfaces, which are characterized by the presence of gas-saturated ice crystallites and high jointing of quartz. It has been established that the migration of hydrocarbons, primarily methane, frozen in sedimentary strata causes significant changes of the pH/Eh parameters: local anaerobic conditions may be changed by microaerophilic ones through the formation of oxygen during crystallization of the water in the slide area; mainly neutral and weakly acidic conditions can locally be changed by the alkaline ones due to the cryogenic concentration of chlorides during freezing. It was found that the impulse character of hydrocarbon migration in permeation zones of frozen strata causes mosaic distribution of sulfate and iron reduction processes, which control the neogenesis (including as a result of microbiological processes) of various forms of iron compounds: sulfides – carbonates oxides.https://ice-snow.igras.ru/jour/article/view/455аутигенные минералыбиоморфные структурыгидролакколиткриолитозонамиграция углеводородов
spellingShingle A. N. Kurchatova
V. V. Rogov
FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA
Лëд и снег
аутигенные минералы
биоморфные структуры
гидролакколит
криолитозона
миграция углеводородов
title FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA
title_full FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA
title_fullStr FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA
title_full_unstemmed FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA
title_short FORMATION OF GEOCHEMICAL ANOMALIES IN HYDROCARBON MIGRATION IN THE PERMAFROST ZONE OF WESTERN SIBERIA
title_sort formation of geochemical anomalies in hydrocarbon migration in the permafrost zone of western siberia
topic аутигенные минералы
биоморфные структуры
гидролакколит
криолитозона
миграция углеводородов
url https://ice-snow.igras.ru/jour/article/view/455
work_keys_str_mv AT ankurchatova formationofgeochemicalanomaliesinhydrocarbonmigrationinthepermafrostzoneofwesternsiberia
AT vvrogov formationofgeochemicalanomaliesinhydrocarbonmigrationinthepermafrostzoneofwesternsiberia