Research Article
Criterion for Hydraulic Fracture Propagation Behavior at the Interface of a Coal Measure Composite Reservoir
| | Type | Parameter | Number |
| | Mudstone | Elastic modulus (GPa) | 20 | | Poisson’s ratio | 0.25 | | Density (g/mm3) | 1.94 | | Tensile strength (MPa) | 4.1 | | Fracture toughness (MPa·m1/2) | 0.416 | | Horizontal minimum ground stress (MPa) | 25 | | Horizontal maximum ground stress (MPa) | 30 | | Overburden pressure (MPa) | 40 | | Layer thickness (m) | 10 | | Sandstone | Elastic modulus (GPa) | 25 | | Poisson’s ratio | 0.2 | | Density (g/mm3) | 2.45 | | Tensile strength (MPa) | 6.7 | | Fracture toughness (MPa·m1/2) | 0.995 | | Horizontal minimum ground stress (MPa) | 25 | | Horizontal maximum ground stress (MPa) | 30 | | Overburden pressure (MPa) | 40 | | Layer thickness (m) | 20 | | Interface | Tensile strength (MPa) | 1.78 | | Cohesion (MPa) | 1.15 | | Friction factor | 0.15 |
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