Lithofacies paleogeography restoration and its significance of Jurassic to Lower Cretaceous in southern margin of Junggar Basin, NW China

GAO Zhiyong,SHI Yuxin,FENG Jiarui,ZHOU Chuanmin,LUO Zhong

Table 1 Sediment characteristics, sedimentary facies types and reservoir physical properties of Toutunhe Formation- Qingshuihe Formation in southern margin of Junggar Basin

Strata Area Well/Outcrop Strata thickness/m Sandstone thickness/m Sand ground ratio/% Facies Porosity/ % Permeability/ 10-3 μm2 Lower Cretaceous Qingshuihe Formation Western part Well Gaotan 1 71.0 31 43.7 Fan delta plain 13.0-18.0 Well Tuo 6 99.0 71 71.7 Fan delta plain 10.0-11.0 Well Xihu 1 160.0 52 32.5 Fan delta front-lacustrine 1.7-5.6 Well Ka 002 155.0 30 19.4 Fan delta front-lacustrine 7.7-9.8 0.1-2.5 Well Ka 11 106.0 28 26.4 Fan delta front-lacustrine 5.7-16.9 2.9 Well Ka 10 118.0 15 12.7 Fan delta front-lacustrine 8.2 1.3 Well Ka 9 Fan delta front-lacustrine 8.4-15.5 0.1-14.3 Well Ka 003 123.0 25 20.3 Fan delta front-lacustrine 4.0-13.0 0.1-9.0 Well Ka 6 132.0 26 19.7 Fan delta front-lacustrine 1.2-4.5 0.1-22.0 Well Ka 8 135.5 8 5.9 Fan delta front-lacustrine 10.1-10.9 0.2-11.0 Well Ka 001 123.0 36 29.3 Fan delta front-lacustrine 6.3-11.5 0.1-2.9 Sikeshu River 70.0 55 78.6 Fan delta plain 3.4-7.8 0.1-1.8 Jiangjungou profile 156.0 70 44.9 Fan delta plain 4.3-11.9 0.1-186 Aerqingou profile Fan delta plain 5.4-7.8 0.3-0.8 Dongtuositai profile Fan delta plain 3.8-11.3 0.1-1.5 Middle part Manas River profile 60.0 26 43.3 Braided delta front 8.3 0.9 Taxi River profile 51.0 28 54.9 Braided delta plain 9.1-12.4 1.0-1.8 South wing of Qigu anticline 52.0 32 61.5 Braided delta plain 15.1-17.3 21.9-40.6 Yixiantian profile 40.0 10 25.0 Braided delta plain 6.8 8.3 Toutun River profile 87.0 55 63.2 Braided delta front 10.9-13.9 112-224 Well Fangcao 1 100.0 31 31.0 Braided delta front 2.5-10.5 0.1-34.7 Eastern part Well Jiuyun 1 Braided delta front 4.7-17.6 0.3-82.3 Well Jiuyun 2 Braided delta front 6.5-9.1 0.3-2.7 Upper Jurassic Kalazha Formation Middle part Well Dafeng1 220.0 215 97.7 Braided river delta 8-19.1 Toutun river profile 350.0 340 97.1 Braided river 17.7 259.8 Manas river profile 322.0 316 98.1 Alluvial-Braided river 14.5 89.5 Taxi river profile 160.0 156 97.5 Alluvial-Braided river 5.7 0.8 Hutubi river profile 192.0 186 96.9 Alluvial-Braided river 5.9-21.5 0.6-1010.0 Eastern part Well Changshan 1 230.0 221 96.1 Braided river delta 22.8 35.1 Well Jiuyun 1 312.0 300 96.2 Braided river delta 18.6-22.0 Well Jiuyun 2 338.0 Braided river delta 13.5-16.5 Shuimo River profile 326.0 320 98.2 Braided river delta 4.3-25.4 0.1-692.0 Middle Jurassic Toutunhe Formation Western part Well Gaotan 1 141.0 (Not drilled through) 119 84.4 Braided river delta 10.0-12.0 Well Xihu 1 228.0 200 87.7 Braided river delta 8.0-10.0 Well Dushan 1 550.0 360 65.5 Braided river delta 11.6 0.2 Well Ka 11 100.0 64 64.0 Braided river delta 10.2-13.8 0.4-1.1 Well Ka 10 192.0 162 84.4 Braided river delta 8.2-9.8 0.3-8.2 Well Ka 9 97.0 56 57.7 Braided river delta 5.7-11.7 0.1-6.2 Well Ka 8 182.0 158 86.8 Braided river delta 5.1-12.6 0.2-4.6 Well Ka 6 100.0 Braided river delta 6.1-11.5 Well Sican 1 Braided river delta 11.3-24.4 2.9-684.2 Well Ka 001 161.0 140 86.9 Braided river delta 10.1-13.4 0.3-406.0 Well Ka 002 240.0 214 89.2 Braided river delta 6.3-12.1 0.2-5.6 Well Ka 003 154.0 148 96.1 Braided river delta 6.2-12.3 0.2-8.6 Well Ai 2 Braided river delta 11.7-15.3 0.4-97.3 Sikeshu River profile 350.0 41 11.7 Interchannel of braided delta plain 23.0 2.0-2 000.0 Middle part Well Qiqian 2 610.0 274 44.9 River delta 10.0-16.0 0.1-10.0 Well Qi 009 River delta 9.6 Well Qigu 1 510.0 190 37.3 River delta 9.1-11.8 Well Qigu 2 674.0 256 38.0 River delta 9.8-15.0 1.5-15.2 Well Qigu 3 698.0 290 41.5 River delta 9.7-16.0 0.3-10.0 Well Qi 6 649.0 252 38.8 River delta 1.7-13.1 0.1-83.4 Eastern part Well Changshan 1 550.0 305 55.5 River delta 8.0-10.0 Well Jiuyun 1 460.0 260 56.5 River delta 5.7-12.0 0.2-0.8 Well Jiuyun 2 442.0 230 52.0 River delta 2.0-4.7 0.1-0.2 Well Midong 1 540.0 275 50.9 River delta 10.0-16.0 0.1-100.0