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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 4 Major evaluation parameters for shale gas sweet spotting in the southern Sichuan.
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| Type of prospect | Parameters | | Deep water conditions | Deep reservoir conditions | Continuous thickness with
w(U)/w(Th)>1.25/m | Continuous thickness of
grade-I reservoirs/m | Pressure coefficient | Buried depth/m | | Core zone | >4 (Relatively deep-water zone) | ≥10 | ≥1.2 | 2 000-4 500 | | Favorable zone | 2-4 (Semi-deep-water zone) | 10-5 | | Prospective zone | <2 (Relatively shallow-water zone) | <5 | <1.2 | <2 000, >4 500 |
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