«Oilfield engineering»

Shale stratification influence on the development of microscale pores and cracks

UDC: 553.981
DOI: -

Authors:

¹ National Key Laboratory of Continental Shale Oil, Northeast Petroleum University, Daqing, China
² Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing, China
³ Ufa State Petroleum Technological University, Ufa, Russia

Keywords: shale oil reservoir, pore structure, scanning electron microscope, statistical analysis

Annotation:

Shale rocks stratification characteristics play an important role in the distribution of pores and fractures in reservoirs. However, the dependence of pores and cracks structure on the shale rocks lithological characteristics has not yet been sufficiently studied. The authors of the article present the results of studies of shale type influence on the development of pores and cracks and pores and cracks models construction taking into account the lithological heterogeneity of shale rocks. The mechanism determining the distribution of pores and cracks under the influence of shale rocks stratification characteristics has been clarified.

Bibliography:

1. Regional conditions cause contrasting behavior in U-isotope fractionation in black shales: Constraints for global ocean palaeo-redox reconstructions / S.K. Gangl, C.H. Stirling, H.C. Jenkyns [et al.] // Chemical Geology. – 2003. – Vol. 623. – P. 121411. – URL: https://doi.org/10.1016/j.chemgeo.2023.121411

2. Restoration of sedimentary environment and geochemical features of deep marine Longmaxi shale and its significance for shale gas: A case study of the Dingshan area in the Sichuan Basin, South China / Y. Feng, X.M. Xiao, P. Gao [et al.] // Marine and Petroleum Geology. – 2003. – Vol. 151. – P. 106186. – URL: https://doi.org/10.1016/j.marpetgeo.2023.106186

3. You K., Flemings P.B. Methane Hydrate Formation and Evolution During Sedimentation // J. of Geophysical Research: Solid Earth. – 2021. – Vol. 126(4). – URL: https://doi.org/10.1029/2020JB021235

4. Multiscale simulations of shale gas transport in micro/nano-porous shale matrix considering pore structure influence / H. Yu, Y.B. Zhu, X. Jin [et al.] // J. of Natural Gas Science and Engineering. – 2019. – Vol. 64. – P. 28–40. – URL: https://doi.org/10.1016/j.jngse.2019.01.016

5. Micro- to nano-scale areal heterogeneity in pore structure and mineral compositions of a sub-decimeter-sized Eagle Ford Shale / Q.M. Wang, Q.H. Hu, C. Zhao [et al.] // International J. of Coal Geology. – 2022. – Vol. 261. – P. 104093. – URL: https://doi.org/10.1016/j.coal.2022.104093

6. Zhao Y.N., Jin Z.H. Hydrocarbon mixture phase behavior in multi-scale systems in relation to shale oil recovery: The effect of pore size distributions // Fuel. – 2021. – Vol. 291. – P. 120141. – URL: https://doi.org/10.1016/j.fuel.2021.120141

7. Zhang Z.D., Yu Q.C. The effect of water vapor on methane adsorption in the nanopores of shale // J. of Natural Gas Science and Engineering. – 2022. – Vol. 101. – P. 104536. – URL: https://doi.org/10.1016/j.jngse.2022.104536

8. Characterizing pore-level oil mobilization processes in unconventional reservoirs assisted by state-of-the-art nuclear magnetic resonance technique / X. Zhang, B. Wei, J.Y. You [et al.] // Energy. – 2021. – Vol. 236. – P. 121549. – URL: https://doi.org/10.1016/j.energy.2021.121549

9. Application of SAXS and SANS in evaluation of porosity, pore size distribution and surface area of coal / A.P. Radlinski, M. Mastalerz, A.L. Hinde [et al.] // International J. of Coal Geology. – 2004. – Vol. 59. – P. 245–271. – URL: https://doi.org/10.1016/j.coal.2004.03.002

10. Liu X.F., Nie B.S. Fractal characteristics of coal samples utilizing image analysis and gas adsorption. Fuel. – 2016. – Vol. 182. – P. 314–322. – URL: https://doi.org/10.1016/j.fuel.2016.05.110

11. A comprehensive pore structure study of the Bakken Shale with SANS, N2 adsorption and mercury intrusion / K.Q. Liu, M. Ostadhassan, L.W. Sun [et al.] // Fuel. – 2019. – Vol. 245. – P. 274–285. – URL: https://doi.org/10.1016/j.fuel.2019.01.174

12. Impact of shale properties on pore structure and storage characteristics / R.M. Bustin, A.M. Bustin, A. Cui [et al.]// SPE Shale Gas Production Conference, 2008. – URL: https://doi.org/10.2118/119892-MS

13. Clarkson C.R., Bustin R.M. Variation in micropore capacity and size distribution with composition in bituminous coal of the western Canadian sedimentary basin // Fuel. – 1996. – Vol. 75(13). – P. 1483–1498. – URL: https://doi.org/10.1016/0016-2361(96)00142-1

14. Adsorption isotherm calculation and mechanism of high pressure and high temperature shale gases / S. Yang, C.P. Zhao, B.Y. Ji [et al.] // Fuel. – 2023. – Vol. 331(Part 2). – P. 125854. – URL: https://doi.org/10.1016/j.fuel.2022.125854

15. Adeleye J.O., Akanji L.T. A quantitative analysis of flow properties and heterogeneity in shale rocks using computed tomography imaging and finite-element based simulation // J. of Natural Gas Science and Engineering. – 2022. – Vol. 106. – P. 104742. – URL: https://doi.org/10.1016/j.jngse.2022.104742

16. A novel upscaling procedure for characterizing heterogeneous shale porosity from nanometer-to millimetre-scale in 3D / L. Ma, P.J. Dowey, E. Rutter [et al.] // Energy. – 2019. – Vol. 181. – P. 1285–1297. – URL: https://doi.org/10.1016/j.energy.2019.06.011

17. Multiscale pore structure and its effect on gas transport in organic-rich shale / T. Wu, X. Li, J. Zhao, D. Zhang // Water Resources Research. – 2017. – Vol. 53(7). – P. 5438–5450. – URL: https://doi.org/10.1002/2017WR020780

18. Chalmers G.R.L., Ross D.J.K., Bustin R.M. Geological controls on matrix permeability of Devonian gas shales in the Horn River and Liard basins, northeastern British Columbia, Canada // International J. of Coal Geology. – 2012. – Vol. 103. – P. 120–131. – URL: https://doi.org/10.1016/j.coal.2012.05.006

19. Development of organic porosity in the Woodford shale with increasing thermal maturity / M.E. Curtis, B.J. Cardott, C.H. Sondergeld, C.S. Rai // International J. of Coal Geology. – 2012. – Vol. 103 – P. 26–31. – URL: https://doi.org/10.1016/j.coal.2012.08.004