Determination of Mining-Induced Changes in Hydrogeological Parameters of Overburden Aquifer in a Coalfield, Northwest China: Approaches Using the Water Level Response to Earth Tides

<table class="table-group sidewaystable" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left" colspan="3">Stratum</td><td class="align_center" rowspan="2">Lithology</td><td class="align_center" rowspan="2">Thickness</td><td class="align_center" rowspan="2">Hydraulic conductivity (m/d)</td><td class="align_center" rowspan="2">Specific capacity (L/s m)</td></tr><tr class="thead"><td class="align_left">System</td><td class="align_center">Series</td><td class="align_center">Group</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left" rowspan="3">Quaternary</td><td class="align_center">Holocene (Q4)</td><td class="align_center">Aeolian sand (Q4eol) Alluvium (Q4al)</td><td class="align_center">Fine-grained sand</td><td class="align_center">0-39.08 Ave 9.2 0-6.05</td><td class="align_center">0.2701-6.42</td><td class="align_center">0.055-0.244</td></tr><tr><td class="align_center">Upper Pleistocene (Q3)</td><td class="align_center">Salawusu (Q3s)</td><td class="align_center">Sandy soil, sandy clay</td><td class="align_center">0-27.53 Ave 7.61</td><td class="align_center">0.448-6.883</td><td class="align_center">0.001376-0.5435</td></tr><tr><td class="align_center">Middle Pleistocene (Q2)</td><td class="align_center">Lishi (Q2l)</td><td class="align_center">Sandy soil, sandy clay</td><td class="align_center">0-6.5</td><td class="align_left"></td><td class="align_left"></td></tr><tr><td class="align_center" colspan="7"><hr/></td></tr><tr><td class="align_left">Neogene</td><td class="align_center">Pliocene (N2)</td><td class="align_center">Baode (N2b)</td><td class="align_center">Sandy clay, clay</td><td class="align_center">0-103.37 Ave 60.8</td><td class="align_left"></td><td class="align_left"></td></tr><tr><td class="align_center" colspan="7"><hr/></td></tr><tr><td class="align_left" rowspan="2">Jurassic</td><td class="align_center" rowspan="2">Middle Jurassic (J2)</td><td class="align_center">Zhiluo (J2z)</td><td class="align_center">Sandstone, mudstone</td><td class="align_center">13.58-42.53</td><td class="align_center">0.0179-2.277</td><td class="align_center">0.0078~0.4461</td></tr><tr><td class="align_center">Yanan (J2y)</td><td class="align_center">Sandstone, mudstone, coal seam</td><td class="align_center">170.52-240.9 Ave 208.97</td><td class="align_center">0.000269-0.0003</td><td class="align_center">0.0000652-0.00058</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The stratum and aquifer parameters by pumping test of Ningtiaota Coalfield.</div>

Geofluids

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Table 1

Table 1: Determination of Mining-Induced Changes in Hydrogeological Parameters of Overburden Aquifer in a Coalfield, Northwest China: Approaches Using the Water Level Response to Earth Tides 

Table 1 | Determination of Mining-Induced Changes in Hydrogeological Parameters of Overburden Aquifer in a Coalfield, Northwest China: Approaches Using the Water Level Response to Earth Tides 