Comprehensive Characterization Integrating Static and Dynamic Data for Dynamic Fractures in Ultra-Low Permeability Reservoirs: A Case Study of the Chang 6 Reservoir of the Triassic Yanchang Formation in the Ordos Basin, China
Abstract
:1. Introduction
2. Dynamic Fracture Characterization Method and Workflow
3. Comprehensive Characterization of Dynamic Fractures
3.1. Brittleness Evaluation
3.1.1. Analysis of Rock Mechanic Parameter Experiment
3.1.2. Analysis of Rock Mineral Composition
3.1.3. Case Analysis
3.2. Quantitative Description of Natural Fractures
3.2.1. Characteristics of Natural Fractures in Cores
3.2.2. Characteristics of Natural Fractures in Geological Outcrops
3.2.3. Natural Fracture Intensity
3.2.4. Case Analysis
3.3. Dynamic Fracture Distribution Intensity
- ①
- Establishment stage of transient pressure—fractures grow rapidly to a certain scale;
- ②
- Dry oil production stage—the fracture length is fixed;
- ③
- Water breakthrough stage of the producers—the waterflooding front enters the surrounding area of the producers with a relatively high-pressure gradient, and the dynamic fracture develops to the maximum length;
- ④
- Fracture shrinkage stage—the water cut of the producers keeps rising and the fracture shrinks.
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Well | Lithology | Depth/m | Density/ g/cm3 | Confining Pressure, Pore Pressure/MPa | Compressive Strength σ1/Mpa | Elastic Modulus E/GPa | Poisson’s Ratio μ | Brittleness Index % |
---|---|---|---|---|---|---|---|---|
A | Brown fine sandstone | 1028.26 | 2.27 | 5, 2 | 89.4 | 13 | 0.18 | 38.88 |
B | Grayish-white calcareous sandstone | 1025.67 | 2.51 | 5, 2 | 118.42 | 21.45 | 0.18 | 43.99 |
C | Greyish-black siltstone | 1035.1 | 2.58 | 5, 2 | 78.39 | 10.57 | 0.22 | 31.03 |
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Wang, Y.; Song, X. Comprehensive Characterization Integrating Static and Dynamic Data for Dynamic Fractures in Ultra-Low Permeability Reservoirs: A Case Study of the Chang 6 Reservoir of the Triassic Yanchang Formation in the Ordos Basin, China. Minerals 2022, 12, 1277. https://doi.org/10.3390/min12101277
Wang Y, Song X. Comprehensive Characterization Integrating Static and Dynamic Data for Dynamic Fractures in Ultra-Low Permeability Reservoirs: A Case Study of the Chang 6 Reservoir of the Triassic Yanchang Formation in the Ordos Basin, China. Minerals. 2022; 12(10):1277. https://doi.org/10.3390/min12101277
Chicago/Turabian StyleWang, Youjing, and Xinmin Song. 2022. "Comprehensive Characterization Integrating Static and Dynamic Data for Dynamic Fractures in Ultra-Low Permeability Reservoirs: A Case Study of the Chang 6 Reservoir of the Triassic Yanchang Formation in the Ordos Basin, China" Minerals 12, no. 10: 1277. https://doi.org/10.3390/min12101277
APA StyleWang, Y., & Song, X. (2022). Comprehensive Characterization Integrating Static and Dynamic Data for Dynamic Fractures in Ultra-Low Permeability Reservoirs: A Case Study of the Chang 6 Reservoir of the Triassic Yanchang Formation in the Ordos Basin, China. Minerals, 12(10), 1277. https://doi.org/10.3390/min12101277