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Discovery and geological knowledge of the large deep coal-formed Qingyang Gas Field, Ordos Basin, NW China
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FU Jinhua,WEI Xinshan,LUO Shunshe,ZUO Zhifeng,ZHOU Hu,LIU Baoxian,KONG Qingfen,ZHAN Sha,NAN Junxiang
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Table 1 Statistics on organic matter abundance of Upper Paleozoic gas source rocks in Longdong area.
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| Horizon | Lithology | TOC/% | Hydrocarbon-generation potential/(mg?g-1) | Chloroform bitumen “A”/% | (Bitumen “A”/TOC)/% | Shan 2
Member | Coal | 40.37-84.66
66.35(17) | 1.89-53.22
12.62(15) | 0.0140-0.359 0
0.1058(8) | 0.0185-0.291 1
0.1142(7) | | Dark-colored mudstone | 0.11-34.74
3.15(95) | 0.01-8.11
0.38(48) | 0.0019-0.014 7
0.0055(17) | 0.0227-1.050 0
0.3762(16) | Taiyuan
Formation | Coal | 41.10-91.32
64.11(7) | | 0.1080(1) | 0.2628(1) | | Dark-colored mudstone | 0.19-36.20
5.28(32) | 0.02-3.18
0.42(21) | 0.0069-0.020 0
0.0105(4) | 0.0552-0.213 3
0.1420(4) |
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