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Transformation peculiarities of gypsum cover of oil-bearing strata in the outbreak zone (by example of Syukeyevskoye bitumen deposit)

Authors: E.A. Korolev, I.A. Khuzin, A.A. Galeev, Sh.Z. Ibragimov (Kazan (Volga Region) Federal University

Key words: Upper Kazanian substage, black gypsum, green gypsum, hydrocarbons, magnetite, pyrite.

Transformations of Upper Kazanian gypsum cover of oil-bearing strata in the outbreak zone are considered by example of Syukeyevskoye bitumen deposit. It was established that gypsum exhibits induced color around hydrocarbon fluid migration channels. The gypsum color changes with distance from hydrocarbon migration channels in following sequence: dark-brown – black – green – white unaltered gypsum. The black color appears due to inclusions of fine dispersed pyrite and magnetite, green — due to iron hydrosulfates. Pyrite and magnetite are the waste products of hydrocarbon-utilizing microbial communities. Iron hydrosulfates are the products of pyrite oxidation. Similar patterns of relationship in gypsum colors enable to reveal ancient and current water-oil fluid migration paths in sulfate rocks.

References
1. Korolev E.A., Morozov V.P., Leonova L.V., Lithological indicators of hydrocarbon fluids migration in the Volgian fault zone within the Republic of Tatarstan (In Russ.), Uchenye zapiski Kazanskogo universiteta. Estestvennye nauki, 2011, V. 153, no. 4, pp. 199-210.
2. Troepol'skiy V.I., Gordeev E.V., Istoriya izucheniya, sovremennoe sostoyanie i perspektivy Syukeevskogo mestorozhdeniya bituminoznykh porod kak ob"ekta vozmozhnoy kompleksnoy razrabotki dlya ispol'zovaniya v narodnom khozyaystve (History of the study, the current status and prospects of Syukeevskoe bituminous field as an object of possible complex development for use in the national economy), Kazan': Publ. of KSU, 1990, 155 p.
3. Burov B.V., Yasonov P.G., Vvedenie v differentsial'nyy termomagnitnyy analiz gornykh porod (Introduction to differential thermomagnetic analysis of
rocks), Kazan': Publ. of KSU, 1979, 156 p.
4. Morozov V.V., Izomorfnye zameshcheniya i drugie magnitomineralogicheskie osobennosti zheleza v zone gipergeneza (Isomorphic substitution and other magnetomineralogical especially iron in the supergene zone): Thesis of doctor of fisical and mathematical science, Moscow, 2006. 

Key words: Upper Kazanian substage, black gypsum, green gypsum, hydrocarbons, magnetite, pyrite.

Transformations of Upper Kazanian gypsum cover of oil-bearing strata in the outbreak zone are considered by example of Syukeyevskoye bitumen deposit. It was established that gypsum exhibits induced color around hydrocarbon fluid migration channels. The gypsum color changes with distance from hydrocarbon migration channels in following sequence: dark-brown – black – green – white unaltered gypsum. The black color appears due to inclusions of fine dispersed pyrite and magnetite, green — due to iron hydrosulfates. Pyrite and magnetite are the waste products of hydrocarbon-utilizing microbial communities. Iron hydrosulfates are the products of pyrite oxidation. Similar patterns of relationship in gypsum colors enable to reveal ancient and current water-oil fluid migration paths in sulfate rocks.

References
1. Korolev E.A., Morozov V.P., Leonova L.V., Lithological indicators of hydrocarbon fluids migration in the Volgian fault zone within the Republic of Tatarstan (In Russ.), Uchenye zapiski Kazanskogo universiteta. Estestvennye nauki, 2011, V. 153, no. 4, pp. 199-210.
2. Troepol'skiy V.I., Gordeev E.V., Istoriya izucheniya, sovremennoe sostoyanie i perspektivy Syukeevskogo mestorozhdeniya bituminoznykh porod kak ob"ekta vozmozhnoy kompleksnoy razrabotki dlya ispol'zovaniya v narodnom khozyaystve (History of the study, the current status and prospects of Syukeevskoe bituminous field as an object of possible complex development for use in the national economy), Kazan': Publ. of KSU, 1990, 155 p.
3. Burov B.V., Yasonov P.G., Vvedenie v differentsial'nyy termomagnitnyy analiz gornykh porod (Introduction to differential thermomagnetic analysis of
rocks), Kazan': Publ. of KSU, 1979, 156 p.
4. Morozov V.V., Izomorfnye zameshcheniya i drugie magnitomineralogicheskie osobennosti zheleza v zone gipergeneza (Isomorphic substitution and other magnetomineralogical especially iron in the supergene zone): Thesis of doctor of fisical and mathematical science, Moscow, 2006. 


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