Geological conditions of natural gas accumulation and new exploration areas in the Mesoproterozoic to Lower Paleozoic of Ordos Basin, NW China

DU Jinhu,LI Xiangbo,BAO Hongping,XU Wanglin,WANG Yating,HUANG Junping,WANG Hongbo,WANYAN Rong,WANG Jing

Table 1 Statistics on basic parameters of the Mesoproterozoic-Lower Paleozoic source rocks in the Ordos Basin and its periphery.

Area Strata Thickness/m TOC/% Ro/% Location of data point Literature Ordos Mesopro- terozoic Changcheng System top < 5( not drilled) 3.0-5.0(3.6) 1.8-2.2(2.0) Tao 59 [3] Cuizhuang Formation > 40 0.20-1.50(0.52) 2.5-3.0(2.6) Yongji in Shanxi [3] Cuizhuang Formation 22 0.22-0.98(0.62) 2.39-2.4 Jitan 1 [3] Shujigou Formation 100-300 0.8-17.0(3.8) 2.0-3.0(2.2) Guyang in Mongolia [3] Cambrian Xuzhuang Formation 30.5 0.30-0.40(0.35) Tao 59 This paper >20 (< 0.3) Weibei Uplift This paper Dongpo Formation 2-80 0.19-11.18(3.14) 2.4-4.9(3.55) Luonan and Gucheng in Shaanxi, Sanmenxia in He’nan This paper Ordovician Beiguoshan Formation 20-200 0.03-5.64(0.57) 0.89-1.26 Southern Qinling Trough Southern Qinling Trough [1] Pingliang Formation 20-160 0.01-3.30(0.42) Southern Qinling Trough [1] Ma 6 Member 5-40 0.01-0.90(0.17) Southern Qinling Trough [1] Wulalike Formation 0.06-4.55(0.58) Western Qilian Trough [1] Kelimoli Formation 0.03-4.08(0.49) Western Qilian Trough [1] Zhuozishan Formation 0.03-4.06(0.26) Western Qilian Trough [1] Upper member of Ma 5 > 40 (cumulative) 0.18-7.48(1.14) Eastern salt sag [36] Ma 56-10 Submember 5-23 (cumulative) (0.2) Eastern salt sag [35] Hefei Cambrian Madian Formation 20-40 1.80-19.00(6.13) 2.2-4.1(3.4) Huoqiu in Anhui [33] Sinian Fengtai Formation >60 1.09-3.56(2.20) 2.1-3.7(2.5) Huoqiu in Anhui [3] Beijing-Liaoning Mesopro- terozoic Xiamaling Formation >260 3.0-21.0(5.2) 0.6-1.4(1.1) Xiahuayuan in Hebei [3] Hongshuizhuang Formation >90 1.0-6.0(4.1) 0.80-2.10(1.63) Kuancheng in Hebei [3] Chuanlinggou Formation >240 0.6-15.0(2.0) 1.2-2.5(2.2) Kuancheng in Hebei [3]