An analysis of major scientific problems and research paths of Gulong shale oil in Daqing Oilfield, NE China

SUN Longde,LIU He,HE Wenyuan,LI Guoxin,ZHANG Shuichang,ZHU Rukai,JIN Xu,MENG Siwei,JIANG Hang

Table 1. Comparison table of main characteristic parameters of shale oil in China and abroad.

Shale oil Reservoir type Reservoir depth/m Effective thickness/m Porosity/% Permeability/10-3 μm2 Gas-oil ratio/(m3?m-3) Pressure factor Crude oil viscosity/(mPa?s) Brittle mineral content/% Eagle Ford Black calcareous shale (brittle) 1200-4300 15-100 5.0-14.0 0.001-0.002 240 1.4-1.7 >80 Dongying sag of Shengli Oilfield Argillaceous shale 3300-3600 10.0-19.4 0.000 85-177 1.2-1.8 Dagang Cangdong (Guan 1702H) Laminated shale (with beddings and fractures) 3900 10-40 6.0-9.0 0.11-4.00 82-103 0.96-1.27 19 >80 Jimusar Dolomitic siltstone, limestone, and dolomite 2300-4300 4-33 6.0-14.0 0.01 17 1.2-1.6 >50 28-45 Gulong sandwich-type shale oil Thin sand-mud interbeds 1978-2000 0.2-1.5 2.5-6.5 0.01-0.02 30.13 1.13 3.65 >35 Gulong pure shale type shale oil Mudstone, argillaceous shale (with beddings) 2000-2500 4.4-22.8 4.0-15.0 <0.01 70-800 1.30-1.57 2.70-10.74 >30