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Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China
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LI Wei,WANG Xueke,ZHANG Benjian,CHEN Zhuxin,PEI Senqi,YU Zhichao
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Table 1 The Quaternary formation water and biogas properties in the eastern Qaidam Basin.
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Geographic
location | Well number or gas field | Formation water
salinity/(mg·l-1) | Natural gas solubility
in water/(m3·m-3) | Dispersed free gas content
in formation water/(m3·m-3) | Methane carbon isotopic composition/‰ | Southern basin
margin | Well Geshen 1 | 632 | 2.29 | 6.15 | | | Southern slope | Well Dashen 1 | 8 219 | 1.82 | 6.92 | | Eastern area of
central depression | Well Chadi 3 | 15 680 | 1.35 | 7.08 | | Sedong area of
central depression | Well Sedong 1 | 156 800 | 0.73 | 7.15 | –72.3 | | Sebei area | Sebei Gas Field | 161 300 | 0.72 | 7.21 | –67.2 | Taijnar gas-
bearing structure | Well Taizhong 1 | 82 600 | 1.08 | 6.88 | –68.9 | Salt lake gas-
bearing structure | Well Dizhong 12 | 55 650 | 1.13 | 6.72 | –64.6 |
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