Hydraulic Fracture Propagation and Permeability Evolution in the Composite Thin Coal Seam

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/5576328/figures/5576328.fig.004a.svgz" name="5576328.fig.004a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Fluid-injection pressure: 3 MPa</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/5576328/figures/5576328.fig.004b.svgz" name="5576328.fig.004b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Fluid-injection pressure: 5.4 MPa</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/5576328/figures/5576328.fig.004c.svgz" name="5576328.fig.004c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Fluid-injection pressure: 8.2 MPa</td></tr><tr class="fig-image" id="d"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/5576328/figures/5576328.fig.004d.svgz" name="5576328.fig.004d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>Fluid-injection pressure: 8.2 MPa (continuous injection of fluid)</td></tr></table>

<div>Distributions of water flow and its vertical component.</div>

Geofluids

fig4

Figure 4

Figure 4: Hydraulic Fracture Propagation and Permeability Evolution in the Composite Thin Coal Seam 