Conditions of formation and development of the void space at great depths

UDK: 553.98(181М>4000)
DOI: 10.24887/0028-2448-2018-4-22-27
Key words: great depths, kerogen, source rock, unconventional reservoir, organic matter, porosity, hydrocarbons, Rock-Eval
Authors: V.Yu. Kerimov (Gubkin University, RF, Moscow; Sergo Ordzhonikidze Russian State Geological Prospecting University, RF, Moscow), A.V. Osipov (Gubkin University, RF, Moscow), R.N. Mustaev (Gubkin University, RF, Moscow; Sergo Ordzhonikidze Russian State Geological Prospecting University, RF, Moscow), L.I. Minligalieva (Gubkin University, RF, Moscow), D.A. Huseynov (Institute of Geology and Geophysics of Azerbaijan National Academy of Sciences, Azerbaijan, Baku)

The article shows the effect of organic porosity (or porosity in the texture of kerogen), formed as a result of the transformation of organic matter, on the accumulation of hydrocarbons. According to the classical ideas, the main function of source rocks is the generation of hydrocarbons. However, recently source rocks have been identified, which are not only a source of hydrocarbon formation, but also a place of their accumulation. Organic pores in the texture of the kerogen of these strata contribute significantly to the volume of the void space of newly formed reservoirs and, as a result, increase their resource potential. As an example of this phenomenon in the oil and gas bearing provinces of the Russian Federation, we can name the beds of the Bazhenov and Khadum formations, the Domanic Horizon and others, which are hybrid phenomena that combine both traditional and non-traditional accumulations of hydrocarbons. An example of the analysis of the organic matter of rocks from two wells in the southern part of the Pre-Urals foredeep (wells No. 35 Chiliksaiskaya, 176 Terektinskaya) by the Rock-Eval method examines the reasons for the retention of hydrocarbons by both the mineral matrix and parent rock kerogen, and also shows the effect of the kerogen surface on the retention of hydrocarbons. A quantitative assessment of the organic porosity of the studied rocks is given, which makes it possible to determine the predicted volumes of retention of hydrocarbons generated in the process of catagenesis. According to the results of the research, it has been established that at moderate depths of occurrence of source rocks, the release of hydrocarbons forms a porous surface that, in the first place, retains components of increased molecular mass and polarity. Detached from the surface of the kerogen, in the first place, light and saturated hydrocarbons, and only then heavy. However, in the deep-buried horizons, at an elevated temperature, the process of desorption becomes predominant. In such conditions, the influence of the level of development of pore space is reduced. Higher temperatures intensify the desorption of hydrocarbons to such an extent that the influence on the adsorption of organic pore space is leveled.

References

1. Kerimov V.Yu., Bondarev A.V., Osipov A.V., Serov S.G., Evolution of petroleum systems in the territory of Baikit anticlise and Kureiskaya syneclise (Eastern Siberia) (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 5, pp. 39–42.

2. Kerimov V.Yu., Lapidus A.L., Yandarbiev N.S. et al., Physicochemical properties of shale strata in the Maikop series of Ciscaucasia, Solid Fuel Chemistry, 2017, V. 51, Part 2, pp. 122–130.

3. Kerimov V.Y., 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, V. 476(1), pp. 1066–1068.

4. Kerimov V.Yu., Mustaev R.N., Yandarbiev N.Sh., Movsumzade E.M., Environment for the formation of shale oil and gas accumulations in low-permeability sequences of the Maikop series, Fore-Caucasus, Oriental Journal of Chemistry, 2017, V. 33(2), pp. 879–892.

5. Kerimov V.Yu., Osipov A.V., Lavrenova E.A., The hydrocarbon potential of deep horizons in the south-eastern part of the Volga-Urals oil and gas province (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 4, pp. 33–35.

6. Guliyev I.S., Kerimov V.Y., 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.

7. Mustaev R.N., Hai W.N., Kerimov V.Yu., Leonova E.A., Generation and conditions formation of hydrocarbon deposits in Kyulong basin by simulation results hydrocarbon systems, Proceedings of 17th Scientific-Practical Conference on Oil and Gas Geological Exploration and Development “Geomodel 2015”, EAGE, 2015, pp. 212–216.

8. Chen F., Lu Sh., Ding X., Organoporosity evaluation of shale: A case study of the Lower Siluian Longmaxi Shale in Southeast Chongqing, China, Hindawi Publishing Corporation Scientific World Journal, 2014, V. 2014, pp. 1–9.

9. Modica C.J., Scott G., Lapierre 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, V. 96, no. 1, pp. 87–108.

10. Loucks R.G., Reed R.M., Ruppel S.C., Jarvie D.M., Morphology, genesis, and distribution of nanometerscale pores in siliceous mudstones of the Mississippian Barnett Shale, Journal of Sedimentary Research, 2009, V. 79, pp. 848–861.

11. 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, V. 60, pp. 435–441.

12. Gutman I.S., Potemkin G.N., Balaban I.Yu. et al., Methodical methods for specifying the pyrolytic parameters for an objective oil resources assessment of the Bazhenov formation of Western Siberia (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 10, pp. 80–85.

13. Gutman I.S., Potemkin G.N., Postnikov A.V. et al., Methodical approaches to the reserves and resources estimation of Bazhenov formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 3, pp. 28–32.

14. Batalin O.Yu., Vafina N.G., Forms of free-hydrocarbon capture by kerogen (In Russ.), Mezhdunarodnyy zhurnal prikladnykh i fundamental'nykh issledovaniy, 2013, no. 10, pp. 418–425.

15. Pepper A.S., Corvi P.J., Simple kinetic models of petroleum formation. Part I: Oil and Gas generation from kerogen, Marine and Petroleum Geology, 1995, V. 12, no. 3, pp. 291–319.

16. Li Q., Jiang Z., You X. et al., A methodology for estimating the organic porosity of the source rocks at the mature stage: example from the marlstone in the Shulu Sag, Bohai Bay Basin, Arabian Journal of Geosciences, 2016, V. 9, no. 6, 11 p.

The article shows the effect of organic porosity (or porosity in the texture of kerogen), formed as a result of the transformation of organic matter, on the accumulation of hydrocarbons. According to the classical ideas, the main function of source rocks is the generation of hydrocarbons. However, recently source rocks have been identified, which are not only a source of hydrocarbon formation, but also a place of their accumulation. Organic pores in the texture of the kerogen of these strata contribute significantly to the volume of the void space of newly formed reservoirs and, as a result, increase their resource potential. As an example of this phenomenon in the oil and gas bearing provinces of the Russian Federation, we can name the beds of the Bazhenov and Khadum formations, the Domanic Horizon and others, which are hybrid phenomena that combine both traditional and non-traditional accumulations of hydrocarbons. An example of the analysis of the organic matter of rocks from two wells in the southern part of the Pre-Urals foredeep (wells No. 35 Chiliksaiskaya, 176 Terektinskaya) by the Rock-Eval method examines the reasons for the retention of hydrocarbons by both the mineral matrix and parent rock kerogen, and also shows the effect of the kerogen surface on the retention of hydrocarbons. A quantitative assessment of the organic porosity of the studied rocks is given, which makes it possible to determine the predicted volumes of retention of hydrocarbons generated in the process of catagenesis. According to the results of the research, it has been established that at moderate depths of occurrence of source rocks, the release of hydrocarbons forms a porous surface that, in the first place, retains components of increased molecular mass and polarity. Detached from the surface of the kerogen, in the first place, light and saturated hydrocarbons, and only then heavy. However, in the deep-buried horizons, at an elevated temperature, the process of desorption becomes predominant. In such conditions, the influence of the level of development of pore space is reduced. Higher temperatures intensify the desorption of hydrocarbons to such an extent that the influence on the adsorption of organic pore space is leveled.

References

1. Kerimov V.Yu., Bondarev A.V., Osipov A.V., Serov S.G., Evolution of petroleum systems in the territory of Baikit anticlise and Kureiskaya syneclise (Eastern Siberia) (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 5, pp. 39–42.

2. Kerimov V.Yu., Lapidus A.L., Yandarbiev N.S. et al., Physicochemical properties of shale strata in the Maikop series of Ciscaucasia, Solid Fuel Chemistry, 2017, V. 51, Part 2, pp. 122–130.

3. Kerimov V.Y., 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, V. 476(1), pp. 1066–1068.

4. Kerimov V.Yu., Mustaev R.N., Yandarbiev N.Sh., Movsumzade E.M., Environment for the formation of shale oil and gas accumulations in low-permeability sequences of the Maikop series, Fore-Caucasus, Oriental Journal of Chemistry, 2017, V. 33(2), pp. 879–892.

5. Kerimov V.Yu., Osipov A.V., Lavrenova E.A., The hydrocarbon potential of deep horizons in the south-eastern part of the Volga-Urals oil and gas province (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 4, pp. 33–35.

6. Guliyev I.S., Kerimov V.Y., 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.

7. Mustaev R.N., Hai W.N., Kerimov V.Yu., Leonova E.A., Generation and conditions formation of hydrocarbon deposits in Kyulong basin by simulation results hydrocarbon systems, Proceedings of 17th Scientific-Practical Conference on Oil and Gas Geological Exploration and Development “Geomodel 2015”, EAGE, 2015, pp. 212–216.

8. Chen F., Lu Sh., Ding X., Organoporosity evaluation of shale: A case study of the Lower Siluian Longmaxi Shale in Southeast Chongqing, China, Hindawi Publishing Corporation Scientific World Journal, 2014, V. 2014, pp. 1–9.

9. Modica C.J., Scott G., Lapierre 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, V. 96, no. 1, pp. 87–108.

10. Loucks R.G., Reed R.M., Ruppel S.C., Jarvie D.M., Morphology, genesis, and distribution of nanometerscale pores in siliceous mudstones of the Mississippian Barnett Shale, Journal of Sedimentary Research, 2009, V. 79, pp. 848–861.

11. 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, V. 60, pp. 435–441.

12. Gutman I.S., Potemkin G.N., Balaban I.Yu. et al., Methodical methods for specifying the pyrolytic parameters for an objective oil resources assessment of the Bazhenov formation of Western Siberia (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 10, pp. 80–85.

13. Gutman I.S., Potemkin G.N., Postnikov A.V. et al., Methodical approaches to the reserves and resources estimation of Bazhenov formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 3, pp. 28–32.

14. Batalin O.Yu., Vafina N.G., Forms of free-hydrocarbon capture by kerogen (In Russ.), Mezhdunarodnyy zhurnal prikladnykh i fundamental'nykh issledovaniy, 2013, no. 10, pp. 418–425.

15. Pepper A.S., Corvi P.J., Simple kinetic models of petroleum formation. Part I: Oil and Gas generation from kerogen, Marine and Petroleum Geology, 1995, V. 12, no. 3, pp. 291–319.

16. Li Q., Jiang Z., You X. et al., A methodology for estimating the organic porosity of the source rocks at the mature stage: example from the marlstone in the Shulu Sag, Bohai Bay Basin, Arabian Journal of Geosciences, 2016, V. 9, no. 6, 11 p.



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