Review of the Hydrogeological Controls on Coalbed Methane (CBM) and Development Trends

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left" colspan="2">Gas production scale</td><td class="align_center">High-yield wells</td><td class="align_center">Medium-yield wells</td><td class="align_center">Low-yield wells</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left" rowspan="3">Structural parts</td><td class="align_center">Higher part</td><td class="align_center">3</td><td class="align_center">6</td><td class="align_center">9</td></tr><tr><td class="align_center">Slope</td><td class="align_center">14</td><td class="align_center">9</td><td class="align_center">10</td></tr><tr><td class="align_center">Lower part</td><td class="align_center">0</td><td class="align_center">1</td><td class="align_center">6</td></tr><tr><td class="align_left" colspan="2">Gas-water ratio</td><td class="align_center">212~6113</td><td class="align_center">91~1944</td><td class="align_center">42~2035</td></tr><tr><td class="align_left" colspan="2">Average value</td><td class="align_center">1988</td><td class="align_center">625</td><td class="align_center">373</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The produced gas-water volume ratio of typical CBM wells and distribution of structural parts in the Fanzhuang block.</div>

Geofluids

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Table 4

Table 4: Review of the Hydrogeological Controls on Coalbed Methane (CBM) and Development Trends 