Experimental Study on the Pore Structure of Middle- and Low-Rank Coal and Its Influence on Methane Adsorption

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Coal</td><td class="align_center">True density (g·cm<sup>-3</sup>)</td><td class="align_center">Apparent density (g·cm<sup>-3</sup>)</td><td class="align_center">Porosity (%)</td><td class="align_center">Tortuosity</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">WZ</td><td class="align_center">1.44</td><td class="align_center">1.39</td><td class="align_center">3.47%</td><td class="align_center">2.65</td></tr><tr><td class="align_left">PDS</td><td class="align_center">1.47</td><td class="align_center">1.35</td><td class="align_center">8.16%</td><td class="align_center">2.22</td></tr><tr><td class="align_left">XJ</td><td class="align_center">1.31</td><td class="align_center">1.22</td><td class="align_center">6.87%</td><td class="align_center">2.31</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Porosity and tortuosity parameters of coal samples.</div>

Geofluids

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Table 3

Table 3: Experimental Study on the Pore Structure of Middle- and Low-Rank Coal and Its Influence on Methane Adsorption 