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Geological characteristics and high production control factors of shale gas reservoirs in Silurian Longmaxi Formation, southern Sichuan Basin, SW China
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MA Xinhua,XIE Jun,YONG Rui,ZHU Yiqing
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Table 3 Oxidation reduction environment indexes for marine shale[20,21,22,23].
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| Oxidation reduction environment | Oxidation reduction index | | w(U)/w(Th) | w(Ni)/w(Co) | w(V)/w(Cr) | DOPT | | Strong reduction environment | >1.25 | >7.00 | >4.25 | >0.75 with H2S, 0.42-0.75
with no H2S | | Weak reduction, weak oxidization environment | 0.75-1.25 | 5.00-7.00 | 2.00-4.25 | | Strong oxidization environment | <0.75 | <5.00 | <2.00 | <0.42 |
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