Numerical Simulation Based on the Canister Test for Shale Gas Content Calculation
Abstract
:1. Introduction
2. Principles and Experiments
2.1. Gas Flow Model and Numerical Simulation
2.2. Molecular Simulation
- (1)
- The crystal structure of calcite is taken as a = 4.99 Å, b = 4.99 Å, and c = 17.61 Å, α = 90°, β = 90°, and γ = 120° with space group R-3C (167) (Figure 1a).
- (2)
- The {10–14} surface of calcite is cleaved to generate a 2D unit cell (Figure 1b): a corner Ca atom is shared by four cells, so the net charge is + 0.5; a bridged Ca atom is shared by two cells, so the net charge is +1.0; the carbonate CO32- species has a net charge of −2; thus, the total net charge of the unit cell is + 0.5 × 4 + 1.0 × 2 − 2 × 2 = 0.
- (3)
- A 10 × 10 supercell is created from the unit cell and expand to the slab high of 50 Å. Because the single calcite layer has a height of 1.55 Å, the total height of the cubic cell is 51.55 Å (Figure 1c).
2.3. Geological Settings
2.4. Sample and Canister Desorption
3. Results and Discussion
3.1. Canister Desorbed Gas and Lost Gas Calculations
3.2. Total Gas in Place (GIP) Based on Volumetric Approaches
3.3. Numerical Models
3.4. Free Gas vs. Adsorbed Gas
3.5. Hydrocarbon Storage in Pore Space
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Approach | Calculation Rule | Gas Content (m3/t rock) |
---|---|---|
Direct Method | Linear extrapolation to “time zero” | 2.11 |
Polynomial extrapolation to “time zero” | 4.66 | |
Linear extrapolation to true “time zero” | 3.40 | |
Polynomial extrapolation to true “time zero” | 13.91 | |
Volumetric Approach | Conventional equation | 6.56 |
Ambrose’s new equation | 5.47 | |
Numerical Simulation | Ignoring adsorbed phase volume | 6.62 |
Considering adsorbed phase volume | 5.88 |
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Kang, S.; Lu, L.; Tian, H.; Yang, Y.; Jiang, C.; Ma, Q. Numerical Simulation Based on the Canister Test for Shale Gas Content Calculation. Energies 2021, 14, 6518. https://doi.org/10.3390/en14206518
Kang S, Lu L, Tian H, Yang Y, Jiang C, Ma Q. Numerical Simulation Based on the Canister Test for Shale Gas Content Calculation. Energies. 2021; 14(20):6518. https://doi.org/10.3390/en14206518
Chicago/Turabian StyleKang, Shujuan, Le Lu, Hui Tian, Yunfeng Yang, Chengyang Jiang, and Qisheng Ma. 2021. "Numerical Simulation Based on the Canister Test for Shale Gas Content Calculation" Energies 14, no. 20: 6518. https://doi.org/10.3390/en14206518