Methane in Soil Gas and Its Migration to the Atmosphere in the Dawanqi Oilfield, Tarim Basin, China

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left"></td><td class="align_center">Soil gas</td><td class="align_center">Absorbed gas</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">CH<sub>4</sub></td><td class="align_center">2.1</td><td class="align_center">3.2</td></tr><tr><td class="align_left">C<sub>2</sub>H<sub>6</sub></td><td class="align_center">0</td><td class="align_center">0.2</td></tr><tr><td class="align_left">C<sub>3</sub>H<sub>8</sub></td><td class="align_center">0</td><td class="align_center">0.1</td></tr><tr><td class="align_left">C<sub>4</sub>H<sub>10</sub></td><td class="align_center">0</td><td class="align_center">0</td></tr><tr><td class="align_left">C<sub>5</sub>H<sub>12</sub></td><td class="align_center">0</td><td class="align_center">0</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td><div>Gas concentration of soil gas samples is in ppmv. Concentration of absorbed gas is in <i>μ</i>l/kg of soil.<br/></div></td></tr></table>

<div>Gas concentration analyses of soil gas and absorbed gas in the background area.</div>

Geofluids

tab4

Table 4

Table 4: Methane in Soil Gas and Its Migration to the Atmosphere in the Dawanqi Oilfield, Tarim Basin, China 