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 1 Oil production and petrophysical properties of major buried hills in the Huanghua Depression.

Buried hill Well name Depth/m Forma- tion Perforation/ (m·layer-1) Daily oil production/t Crude density/ (g·cm-3)* Viscosity/ (mPa·s)* Freezing point/°C Wax content/% Asphaltene+ colloid/% Gangbei Z1502 2 477-2 536 P 26/3 4.15 0.905 6 44.87 17 8.01 41.67 2 990-3 026 O 24/6 1.16 0.739 9 0.49 30 GG1505 2 338-2 363 P 14/3 14.10 0.859 0 56.12 27 17.16 15.87 GG1507 2 080-2 106 C 23/6 33.10 0.848 4 7.36 10 15.68 13.97 GG1607 2 144-2 187 P 30/2 3.13 0.887 6 82.85 27 26.19 26.18 GG16101 2 853-2 856 O 8/3 3.76 0.869 2 27.62 26 16.93 16.87 GG16102 1 904-1 936 P 9/3 6.43 0.878 0 16.19 0 10.91 26.28 Qibei QG8 3 835-3 842 O 7/4 35.70 0.772 3 0.71 30 Chenghai HG102 3 869-3 942 P 26/5 8.19 0.835 9 5.80 25 15.62 12.79 Wumaying YG1 4 959-4 988 P 25/2 24.26 0.809 0 1.36 1 8.04 3.32 YG2 4 703-4 734 P 28/3 18.80 0.804 8 0.91 8 3.85 7.85