Russian State Geological Prospecting University, Moscow, Russia:

Kerimov V. Yu., Prorector For Research, Doctor of Geologo-Mineralogical Sciences
Kosyanov V. A., Rector, Doctor of Engineering Sciences
Mustaev R. N., Associate Professor, Candidate of Geologo-Mineralogical Sciences, r.mustaev@mail.ru

Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russia:
Ismailov D. D., Post-Graduate Student

The article is devoted to the study into conditions of formation of secondary organic porosity—void spaces of organic origin as a result of transformation of organic matter into hydrocarbons in low-permeability shale strata. The experience of studying and developing the known shale formations in the world proves the fact that such strata are hybrid phenomena, i.e., they are both producing strata and reservoir-type strata. Based on the results of the programmed pyrolysis by the Rock-Eval-6 method, the organic (kerogen) porosity is estimated. The study into geochemical characteristics of organic matter in the samples from wells drilled at various test sites makes it possible to analyze causes of rock matrix retention capability.

The reported study was funded by RFBR, project number 20-35-70062.

1. Morariu D., Averyanova O. Yu. Some aspects of oil shale – finding kerogen to generate oil. Neftegazovaya geologiya. Teoriya i praktika. 2013. Vol. 8, No. 1. p. 13.
2. Batalin O. Yu., Vafina N. G. Forms of free-hydrocarbon capture by kerogen. Mezhdunarodnyi zhurnal prikladnykh i fundamentalnykh issledovaniy. 2013. No. 10-3. pp. 418–425.
3. Fangwen Chen, Shuangfang Lu, Xue Ding. Organoporosity evaluation of shale: A case study of the Lower Siluian Longmaxi Shale in Southeast Chongqing, China. The Scientific World Journal. 2014. Vol. 2014.
4. Modica C. J., Lapierre S. G. Estimation of kerogen porosity in source rocks as a function of thermal transformation: Example from the Mowry Shale in the Powder River Basin of Wyoming. AAPG Bulletin. 2012. Vol. 96, No. 1. pp. 87–108.
5. Kerimov V. Yu., Rachinsky M. Z., Mustaev R. N. Osipov A. V. Groundwater Dynamics Forecasting Criteria of Oil and Gas Occurrences in Alpine Mobile Belt Basins. Doklady Earth Sciences. 2017. Vol. 476, Iss. 1. pp. 1066–1068.
6. Guliyev I. S., Kerimov V. Y., Mustaev R. N., Bondarev A. V. The estimation of the generation potential of the low permeable shale strata of the maikop caucasian series. SOCAR Proceedings. 2018, Vol. 1, pp. 4–20.
7. Kerimov V. Y., Gordadze G. N., Lapidus A. L., Giruts M. V., Mustaev R. N., Movsumzade E. M., Zhagfarov F. G., Zakharchenko M. V. Physicochemical Properties and Genesis of the Asphaltites of Orenburg Oblast. Solid Fuel Chemistry. 2018. Vol. 52(2), pp. 128–137.
8. Mustaev R. N., Kerimov V. Y., Yandarbiev N. S., Dmitrievsky S. S. Geochemical Criteria of Petroleum Khadum Formation in the Central and East Ciscaucasia. Proceedings of the 18^th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development. Gelendzhik, 2016.
9. Zaicev V. A., Kerimov V. Y., Mustaev R. N., Dmitrievskiy S. S. Geomechanical modeling of low permeability shale strata of the Maikop series Cciscaucasia. EAGE/SPE Joint Workshop on Shale Science 2017: Prospecting and Development : Conference Proceedings. Moscow, 2017.
10. Guliyev I. S., Kerimov V. Yu., Osipov A. V., Mustaev R. N. Generation and Accumulation of Hydrocarbons at Great Depths Under the Earth’s Crust. SOCAR Proceedings. 2017. No. 1. pp. 4–16.
11. Reinsalu E., Aarna I. About technical terms of oil shale and shale oil. Oil Shale. 2015. Vol. 32, Iss. 4. pp. 291–292.
12. Lapidus A. L., Kerimov V. Yu., Mustaev R. N., Movsumzade E. M., Zakharchenko M. V. Caucasus Maykopian kerogenous shale sequences: Generative potential. Oil Shale. 2018. Vol. 35, Iss. 2. pp. 113–127.
13. Klubovа T. T., Korolev Yu. M., Roznikova A. P., Kosyanova N. M., Konysheva R. A. et al. Pore space and organic matter in reservoirs and cap rocks. Moscow : Nauka, 1986. 94 p.
14. Loucks R. G., Reed R. M., Ruppel S. C., Jarvie D. M. Morphology, genesis, and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett Shale. Journal of Sedimentary Research. 2009. Vol. 79. No. 12. pp. 848–861.
15. Loucks R. G., Reed R. M., Ruppel S. C., Hammes U. Preliminary classification of matrix pores in mudrocks. Gulf Coast Association of Geological Societies Transactions. 2010. Vol. 60. pp. 435–441.