An exploration breakthrough in Paleozoic petroleum system of Huanghua Depression in Dagang Oilfield and its significance, North China

ZHAO Xianzheng,PU Xiugang,JIANG Wenya,ZHOU Lihong,JIN Fengming,XIAO Dunqing,FU Lixin,LI Hongjun

Table 2 Production and geochemical properties of gas in major buried hills of the Huanghua Depression.

Buried hill Well name Depth/m Forma- tion Perforation/ (m·layer-1) Daily gas production/ m3 δC1/ ‰ δC2/ ‰ δCCO2/ ‰ C1/ % C2+/ % N2/ % H2S/ % CO2/ % Drying coefficient Gangbei Z1502 2 478-2 536 P 26/3 47 406 -39.10 -28.40 83.40 9.52 0.61 0 6.42 0.90 GG1505 2 338-2 363 P 14/3 23 611 -43.40 -29.10 81.60 16.98 0.21 0 1.22 0.83 GG1507 2 078-2 106 C 23/6 3 730 -42.20 -29.10 61.30 24.97 0.06 0 13.67 0.71 Qibei QG8 3 835-3 842 O 7/4 162 800 -39.70 -26.70 -5.87 70.60 16.12 0.95 0 12.32 0.81 Chenghai HG1 4 510-4 587 O 33/7 290 000 -27.20 -18.70 -7.64 50.40 0.33 3.86 11.8 33.6 0.99 HG102 3 869-3 942 P 26/5 1 905 -40.40 -28.60 -10.80 77.10 19.13 0.31 0 4.45 0.80 Wumaying YG1 4 959-4 988 P 25/2 80 122 -36.40 -20.90 80.60 9.30 5.29 0 4.85 0.90 4 789-4 874 P 19/8 11 554 -33.21 -21.88 -10.80 85.90 6.76 0.36 0 6.99 0.93 YG2 4 703-4 734 P 28/3 178 897 -33.86 -24.38 79.30 12.50 0.40 0 7.80 0.86 WT1 4 958-4 997 P 18/3 35 000 -37.00 -20.30 85.25 7.09 0.74 0 6.92 0.92 WS1 5 460-5 496 O 26/7 137 279 -38.50 -22.40 86.96 4.87 1.78 6.27 0.12 0.95