Affiliation:
1. Geological Institute RAS
Abstract
Illite-smectite (I-S) minerals from the Upper Jurassic oil-bearing rock shales of Denmark and the North Sea were studied by a complex of diffraction and spectroscopic methods. Detailed structures were identified to reveal the mechanism of diagenetic transformation of these shales. Usually, in oil-bearing rocks of sedimentary basins, oil generation occurs simultaneously with the I-S diagenetic transformation. The results obtained demonstrate the relationship between these two reactions: NH3 molecules released from kerogen during ma-ximum oil formation are fixed as NH4 ammonium cations in smectite or vermiculite interlayers, forming mica or tobelite structural fragments. As a result of this solid-phase transformation, mixed-layer structures are formed, consisting of layers of illite, tobelite, smectite and vermiculite (I-T-S-V).
Publisher
The Russian Academy of Sciences
Reference44 articles.
1. Дриц В.А., Сахаров Б.А. Рентгеноструктурный анализ смешанослойных минералов. М.: Наука, 1976. 256 с.
2. Дриц В.А., Коссовская А.Г. Глинистые минералы: смектиты, смешанослойные образования. М.: Наука, 1990. 214 с.
3. Дриц В.А., Коссовская А.Г. Глинистые минералы: слюды, хлориты. М.: Наука, 1991. 177 с.
4. Arkai P., Merriman R.J., Brinley R., Peacor D.R., Toth M. Crystallinity, crystallite size and lattice strain of illite-muscovite and chlorite; comparison of XRD and TEM data for diagenetic to epizonal pelites // European Journal of Mi-neralogy. 1996. V. 8. P. 1119–1137.
5. Brangulis A.P., Kanev S.V., Margulis L.S., Pomerantseva R.A. Geology and hydrocarbon prospects of the Paleozoic in the Baltic region / Ed. J.R. Parker // Petroleum Geology of Northwest Europe: Proceedings of the 4th Conference. Geological society, London, U.K., 1993. P. 651–656.