Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Characterization of Flow Parameters in Shale Nano-Porous Media Using Pore Network Model: A Field Example from Shale Oil Reservoir in Songliao Basin, China

Qingzhen Wang
,
Zhihao Jia
* ORCID logo ,
Linsong Cheng
,
Binhui Li
,
Pin Jia
,
Yubo Lan
,
Dapeng Dong
,
Fangchun Qu
Version 1 : Received: 8 June 2023 / Approved: 9 June 2023 / Online: 9 June 2023 (09:22:11 CEST)

A peer-reviewed article of this Preprint also exists.

Wang, Q.; Jia, Z.; Cheng, L.; Li, B.; Jia, P.; Lan, Y.; Dong, D.; Qu, F. Characterization of Flow Parameters in Shale Nano-Porous Media Using Pore Network Model: A Field Example from Shale Oil Reservoir in Songliao Basin, China. Energies 2023, 16, 5424. Wang, Q.; Jia, Z.; Cheng, L.; Li, B.; Jia, P.; Lan, Y.; Dong, D.; Qu, F. Characterization of Flow Parameters in Shale Nano-Porous Media Using Pore Network Model: A Field Example from Shale Oil Reservoir in Songliao Basin, China. Energies 2023, 16, 5424.

Abstract

The pore-throat radius of shale oil reservoir is extremely small, and it is difficult to accurately obtain the absolute permeability and oil-water two-phase relative permeability of actual oil reservoir through conventional core experiments. However, these parameters are very important for reservoir numerical simulation. In this paper, a method for characterizing flow parameters based on pore network model that considers differential pressure flow and diffusion flow is proposed. Firstly, a digital core was reconstructed using focused ion beam scanning electron microscopy (FIB-SEM) from the Gulong shale reservoir in the Songliao Basin, China, and a pore network model was extracted. Secondly, quasi-static single-phase flow and two-phase flow equations considering diffusion were established in the pore network model. Finally, pore throat parameters, absolute permeability, and oil-water two-phase permeability curves were calculated, respectively. The results show that the pore throat distribution of Gulong shale reservoir is mainly concentrated in the nanometer scale, the mean pore radius is 87 nm, the mean throat radius is 41 nm, and the mean coordination number is 3.97; The calculated permeability considering diffusion is 0.000124mD, which is approximately twice the permeability calculated without considering diffusion; The irreducible water saturation of the Gulong shale reservoir is approximately 0.26, and the residual oil saturation is approximately 0.73. The method proposed in this paper can provide an important approach for characterizing the flow parameters of similar shale oil reservoirs.

Keywords

Shale oil reservoir; Flow parameters in porous media; FIB-SEM experiment; Pore network model (PNM); Quasi-static flow

Subject

Engineering, Energy and Fuel Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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