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Mixed-layer clay minerals as indicator of diagenesis processes in oil bearing rocs

Authors: G.A. Krinari (Kazan (Volga Region) Federal University, RF, Kazan)

Keywords: interstratified illite-smectite , diagenesis of oil bearing rocks, x-ray analysis.

To optimize oil production technologies must take account of the extent and causes of secondary changes of structures of illite-smectite phase in oil bearing rocs as result of diagenesis processes, but ordinary relation between concentrations of smectite in interstratified phase and depth is absent. The well-developed method for studying mixed layer phases is fitting, in which the parameters of theoretical basal diffraction spectra of clay minerals are chosen so as to fit experimental curves, in particular, for different preparations of samples. This allows identification of phases fr om alternations of different layers and packets. The fitting method is based on the theory of Markov chains, wh ere the probability characteristics for any sequence of layers are uniform and have the same statistical dispersion. In oil bearing rocs this stipulation is often non real. In this occurrence a procedure for structural investigations of illite-smectite phases was worked out an original method of x-ray analysis. It is establish, that in depth more ≈ 2,3 km the oil bearing collector often contain, as admixture, the mixed-layer clay phases which R = 1 and R = 2 together. May be, it is result of secondary removing of oil-water fluid in the oil deposit, if the percolation effect is present. In this chance, it is possible to establish of the history of the oil deposit.

References
1. Drits V.A., Kossovskaya A.G., Glinistye mineraly: Smektity, smeshanosloynye obrazovaniya (Clay minerals: smectite, mixed lattice mineral), Moscow: Nauka Publ., 1990, 206 p.
2. Huang W.L., Longo J.M., Peyear D.R., An experimentally derived kinetic
model for smectite-to-illite conversion and its use as a geothermometer,
Clays & Clay Minerals, 1993, V. 41, pp. 162–177.
3. Šrodoń J., Eberl D.D., Illite, in “Micas”, Reviews in Mineralogy: edited by Bailey
S.W., Mineralogy Society of America, 1984, V. 13, pp. 495–544.
4. Krinari G.A., Rakhmatulina Yu.Sh., Changes in mineral skeleton of oil reservoir in course of water flooding (In Russ.), Neftyanoe khozyaystvo – Oil Industry, 2013, no. 6, pp. 56 - 59.
5. Krinari G.A., Khramchenkov M.G., Rakhmatulina Yu.Sh., Changes in the
structures of mixed-layer Illite-Smectite during flooding of Terrigeneous oil
reservoirs (In Russ.), Geologiya i geofizika – Russian Geology and Geophysics, 2014, V. 55, no. 7, pp. 1153–1167.
6. Krinari G.A., Khramchenkov M.G., Illitization of smectite as nonliving process (In Russ.), Doklady RAN. Geokhimiya, 2005, V. 403, no. 5, pp. 664–669.
7. Krinari G.A.,. Khramchenkov M.G., Three-dimensional structure of secondary mica of sedimentary rocks: characteristics and mechanisms of formation (In Russ.), Doklady RAN. Geokhimiya, 2008, V. 423, no. 4, pp. 524–529.
8. Rakhmatulina Yu.Sh., Krinari G.A., Revelation of the initial stages of the producing
reservoirs watering by secondary mica restructuring (In Russ.), Georesursy
– International Journal of Sciences “Georesources”, 2012, no. 2 (44),
pp. 35–39.
9. Drits V.A., Sakharov B.A., X-ray analysis of minerals mixed lattice mineral
(In Russ.), Proceedings of GIN, 1976, V. 295, 256 p.
10. Yapaskurt O.V., Aspects of the theory of postsedimentary lithogenesis
(In Russ.), Litosfera – Lithosphere, 2005, no. 3, pp. 3–30.
11. Vitvitskiy V.V., Shapenko V.V., New data on the paleotemperatures in Paleozoic
carbonate rocks of south-east of the Russian Platform (In Russ.), Doklady
AN SSSR, 1976, V. 228, no. 4, pp. 936–939.
12. Shvydkin E.K., Yakimov A.S., Vasserman V.A., Geofizicheskie i geokhimicheskie tekhnologii prognoza i otsenki neftenosnosti perspektivnykh ob"ektov (Geophysical and geochemical technology of forecasting and evaluation of oil-bearing perspective objects), Kazan': Novoe znanie Publ., 2008, 164 p.
13. Krinari G.A., Korolev E.A., Pikalev S.N., Volcaniclastic material in the Paleozoic strata of Tatarstan: methods for detection and role in the oil industry (In Russ.), Litosfera – Lithosphere,, 2003, no. 1, pp. 4–12.  

Keywords: interstratified illite-smectite , diagenesis of oil bearing rocks, x-ray analysis.

To optimize oil production technologies must take account of the extent and causes of secondary changes of structures of illite-smectite phase in oil bearing rocs as result of diagenesis processes, but ordinary relation between concentrations of smectite in interstratified phase and depth is absent. The well-developed method for studying mixed layer phases is fitting, in which the parameters of theoretical basal diffraction spectra of clay minerals are chosen so as to fit experimental curves, in particular, for different preparations of samples. This allows identification of phases fr om alternations of different layers and packets. The fitting method is based on the theory of Markov chains, wh ere the probability characteristics for any sequence of layers are uniform and have the same statistical dispersion. In oil bearing rocs this stipulation is often non real. In this occurrence a procedure for structural investigations of illite-smectite phases was worked out an original method of x-ray analysis. It is establish, that in depth more ≈ 2,3 km the oil bearing collector often contain, as admixture, the mixed-layer clay phases which R = 1 and R = 2 together. May be, it is result of secondary removing of oil-water fluid in the oil deposit, if the percolation effect is present. In this chance, it is possible to establish of the history of the oil deposit.

References
1. Drits V.A., Kossovskaya A.G., Glinistye mineraly: Smektity, smeshanosloynye obrazovaniya (Clay minerals: smectite, mixed lattice mineral), Moscow: Nauka Publ., 1990, 206 p.
2. Huang W.L., Longo J.M., Peyear D.R., An experimentally derived kinetic
model for smectite-to-illite conversion and its use as a geothermometer,
Clays & Clay Minerals, 1993, V. 41, pp. 162–177.
3. Šrodoń J., Eberl D.D., Illite, in “Micas”, Reviews in Mineralogy: edited by Bailey
S.W., Mineralogy Society of America, 1984, V. 13, pp. 495–544.
4. Krinari G.A., Rakhmatulina Yu.Sh., Changes in mineral skeleton of oil reservoir in course of water flooding (In Russ.), Neftyanoe khozyaystvo – Oil Industry, 2013, no. 6, pp. 56 - 59.
5. Krinari G.A., Khramchenkov M.G., Rakhmatulina Yu.Sh., Changes in the
structures of mixed-layer Illite-Smectite during flooding of Terrigeneous oil
reservoirs (In Russ.), Geologiya i geofizika – Russian Geology and Geophysics, 2014, V. 55, no. 7, pp. 1153–1167.
6. Krinari G.A., Khramchenkov M.G., Illitization of smectite as nonliving process (In Russ.), Doklady RAN. Geokhimiya, 2005, V. 403, no. 5, pp. 664–669.
7. Krinari G.A.,. Khramchenkov M.G., Three-dimensional structure of secondary mica of sedimentary rocks: characteristics and mechanisms of formation (In Russ.), Doklady RAN. Geokhimiya, 2008, V. 423, no. 4, pp. 524–529.
8. Rakhmatulina Yu.Sh., Krinari G.A., Revelation of the initial stages of the producing
reservoirs watering by secondary mica restructuring (In Russ.), Georesursy
– International Journal of Sciences “Georesources”, 2012, no. 2 (44),
pp. 35–39.
9. Drits V.A., Sakharov B.A., X-ray analysis of minerals mixed lattice mineral
(In Russ.), Proceedings of GIN, 1976, V. 295, 256 p.
10. Yapaskurt O.V., Aspects of the theory of postsedimentary lithogenesis
(In Russ.), Litosfera – Lithosphere, 2005, no. 3, pp. 3–30.
11. Vitvitskiy V.V., Shapenko V.V., New data on the paleotemperatures in Paleozoic
carbonate rocks of south-east of the Russian Platform (In Russ.), Doklady
AN SSSR, 1976, V. 228, no. 4, pp. 936–939.
12. Shvydkin E.K., Yakimov A.S., Vasserman V.A., Geofizicheskie i geokhimicheskie tekhnologii prognoza i otsenki neftenosnosti perspektivnykh ob"ektov (Geophysical and geochemical technology of forecasting and evaluation of oil-bearing perspective objects), Kazan': Novoe znanie Publ., 2008, 164 p.
13. Krinari G.A., Korolev E.A., Pikalev S.N., Volcaniclastic material in the Paleozoic strata of Tatarstan: methods for detection and role in the oil industry (In Russ.), Litosfera – Lithosphere,, 2003, no. 1, pp. 4–12.  


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