Re-recognition of “unconventional” in unconventional oil and gas

JIAO Fangzheng

Table 4 Composition data of shale gas in Wufeng-Longmaxi Formation of the Sichuan Basin.

Block/Basin Formation CH4/% CO2/% N2/% H2S/% Changning-Zhaotong, Sichuan Wufeng- Longmaxi 97.11-99.45 0.01-0.91 0.03-1.79 0 Weiyuan, Sichuan 95.52-99.27 0.02-1.07 0.01-2.95 0 Fushun-Yongchuan, Sichuan 95.32-99.59 0.06-1.74 0.01-4.05 0 Fuling, Sichuan 97.67-98.95 0.02-1.16 0.32-1.36 0 Eastern Sichuan Basin, Sichuan Huanglong 94.36-99.63 0.20-2.68 0.30-3.26 0.12-0.79 Appalachian Marcellus >95.00 0 Fort Worth Barnett 77.02-93.05 0.31-2.68 0.98-7.56 0 Michigan Antrim 64.99-90.81 0.01-5.76 0.51-14.33 0 Illinois New Albany 54.21-92.42 5.55-10.32 0