Measurement of Rock Electrical Parameters and Analysis of Influencing Factors of Quaternary Mudstone Biogas Reservoirs in Qaidam Basin
Abstract
:1. Introduction
2. Sample Preparation and Experimental Methods
2.1. Experimental Samples
2.2. Preliminary Experiments for Rock Electrical Parameter Measurement of Biogas Reservoirs
2.3. “Self-Absorption Water Augmentation Method” for Rock Electrical Parameter Measurement
- (1)
- Core conformation pretreatment: The experimental core sample was cut to the design size by wire-electrode cutting to ensure the end face was flat (Figure 2a). At the same time, in order to prevent the core sample from softening and cracking, a highly temperature-resistant, heat-shrinkable sleeve was used to wrap it (the surrounding surface of the core sample was wrapped, and the two ends were exposed) in order to support and protect the core sample and ensure the integrity of the core sample in the subsequent experiment process (Figure 2b).
- (2)
- Measurement of rock electrical parameters: The water saturation of the core sample was controlled using the capillary self-absorption method, and the resistivity measurement of the core sample was conducted under different water saturation states.
3. Experimental Results
3.1. Relationship between Formation Factors and Porosity
3.2. Relationship between Resistivity Index and Water Saturation
3.3. Cementation Index m and Saturation Index n
4. Discussion and Analysis
4.1. Influence of Lithology on Rock Electrical Parameters
4.2. Influence of Physical Properties on Rock Electrical Parameters
4.3. Influence of Organic Matter Content on Rock Electrical Parameters
5. Conclusions
- (1)
- The core samples of the Quaternary mudstone biogas reservoir in Qaidam Basin generally had a porosity greater than 20% and a permeability between 0.05–5 mD. The rock mineral composition was dominated by clay minerals, followed by carbonate minerals, quartz, and feldspar. The clay mineral composition was mainly illite, followed by montmorillonite and chlorite, with a small amount of kaolinite. The rock was weakly cemented, high in clay, and easy to hydrolyze. It would have been impossible to complete the rock electrical experiment and obtain the rock electrical parameters based on existing industry standard methods.
- (2)
- The use of wire-electrode cutting and high-temperature heat-shrinkable tube to wrap the core sample supported and protected the core sample. The rock resistivity was measured by the self-absorption water augmentation method to obtain the rock electrical parameters of the core samples. The cementation index m of the core samples was in the range of 1.89–2.08, with an average value of 1.99, while the saturation index n was in the range of 1.872–2.270, with an average value of 2.09.
- (3)
- The rock electrical parameters of the reservoir core samples were affected by lithology and physical properties, but not significantly influenced by organic matter content. The cementation index increased with the decreasing clay mineral content, increasing quartz content, and increasing permeability, while the saturation index increased with the decreasing clay mineral content, increasing quartz content, and increasing permeability.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Sample No. | Physical Property | VTOC/Fraction | Mineral Composition | Notes | ||||
---|---|---|---|---|---|---|---|---|
Φ/% | K/mD | Clay Content/% | Quartz Content/% | Carbonate Mineral Content/% | Others | |||
NY-2 | 29.127 | 0.736 | 0.1262 | 53.2 | 19.9 | 23.0 | 3.9 | |
NY-3 | 25.678 | 0.138 | / | / | / | / | / | No XRD analysis |
NY-5 | 26.625 | 0.172 | 0.1652 | / | / | / | / | No XRD analysis |
NY-6 | 28.071 | 0.075 | 0.1914 | 53.6 | 20.3 | 24.1 | 2.0 | |
NY-8 | 29.704 | 0.282 | / | 50.6 | 21.9 | 20.7 | 6.8 | |
NY-10 | 26.439 | 0.402 | 0.1174 | 35.5 | 24.3 | 33.2 | 7.0 | |
NY-11 | 27.854 | 1.220 | 0.1329 | 36.5 | 27.0 | 23.9 | 12.6 | |
NY-16 | 24.417 | 0.258 | 0.0618 | 44.7 | 25.6 | 21.3 | 8.4 |
Sample No. | Rock Electrical Parameters | ||
---|---|---|---|
F | m | n | |
NY-2 | 12.207 | 2.03 | 2.07 |
NY-3 | 13.085 | 1.89 | 2.18 |
NY-5 | 13.355 | 1.96 | 2.17 |
NY-6 | 12.559 | 1.99 | 2.27 |
NY-8 | 10.352 | 1.94 | 2.04 |
NY-10 | 15.079 | 2.04 | 2.13 |
NY-11 | 14.238 | 2.08 | 1.87 |
NY-16 | 16.816 | 2.00 | 1.99 |
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Liu, J.; Chai, X.; Yang, H.; Gu, D.; Wang, L. Measurement of Rock Electrical Parameters and Analysis of Influencing Factors of Quaternary Mudstone Biogas Reservoirs in Qaidam Basin. Energies 2022, 15, 9100. https://doi.org/10.3390/en15239100
Liu J, Chai X, Yang H, Gu D, Wang L. Measurement of Rock Electrical Parameters and Analysis of Influencing Factors of Quaternary Mudstone Biogas Reservoirs in Qaidam Basin. Energies. 2022; 15(23):9100. https://doi.org/10.3390/en15239100
Chicago/Turabian StyleLiu, Junfeng, Xiaoying Chai, Huijie Yang, Duanyang Gu, and Liang Wang. 2022. "Measurement of Rock Electrical Parameters and Analysis of Influencing Factors of Quaternary Mudstone Biogas Reservoirs in Qaidam Basin" Energies 15, no. 23: 9100. https://doi.org/10.3390/en15239100