The significance of coal-derived gas in major gas producing countries

DAI Jinxing,NI Yunyan,LIAO Fengrong,HONG Feng,YAO Limiao

Table 3 Geochemical parameters of the Upper Paleozoic source rock in the Ordos Basin[67, 82].

Formation Lithology Organic carbon/% Chloroform bitumen “A”/% Total hydrocarbon/(μg?g-1) Maceral/% Vitrinite Inertinite Exinite Shanxi Fm. Coal 49.28-89.17 0.10-2.45 519.90-6 699.93 43.8-90.2 6.3-54.0 0-12.3 73.60 0.80 2539.80 73.6 24.0 4.6 Mudstone 0.07-19.29 0.002 4-0.500 0 519.85-524.96 8.0-47.0 51.8-87.0 0-20.3 2.25 0.040 0 163.80 20.5 72.0 7.4 Taiyuan Fm. Coal 3.83-83.20 0.03-1.96 222.0-4 463.0 21.2-98.8 1.3-63.7 0-15.1 74.70 0.61 1757.1 64.2 32.1 3.7 Mudstone 0.10-23.38 0.003-2.950 15.00-1 904.64 8.3-82.0 15.3-89.3 0.3-34.5 3.33 0.120 361.60 38.0 53.3 8.4 Limestone 0.11-6.29 0.002 6-0.430 0 88.92-2 194.53 1.41 0.080 0 493.20 Benxi Fm. Coal 55.38-80.26 0.41-0.97 93.3-72.0 25.2-6.7 0-2.8 70.80 0.77 87.2 16.0 1.4 Mudstone 0.05-11.71 0.002 4-0.440 0 12.51-1 466.34 12.3-47.8 12.3-59.8 0.3-39.5 2.54 0.065 0 322.73 24.5 44.0 18.2