“Exploring petroleum inside source kitchen”: Connotation and prospects of source rock oil and gas

Zhi YANG,Caineng ZOU

Table 2 Comparison of primary parameters of shale oil in China and abroad.

Basin Geology Geochemistry System Structure Sed. background Formation Depth/ m Area/ km2 Shale thickness/m Lithology TOC/ % S1+S2/ (mg?g-1) Ro/ % Organic matter Ordos Triassic Slope, sag Shallow water, Lake basin Yanchang 1 500-3 000 30 000 30-70 Mud shale 5.0-16.0 6-97 0.6-1.1 Ⅰ, Ⅱ1 Songliao Cretaceous Slope, sag Shallow water, Lake basin Qingshankou 1 000-2 700 20 000 40-150 Mud shale 2.0-3.0 5-26 0.5-1.2 Ⅰ, Ⅱ1 Bohai Bay Paleogene Slope, sag Shallow water, Lake basin Shahejie 2 000-4 500 20 000 100-250 Mud shale, marl 3.0-10.0 4-20 0.5-1.3 Ⅰ, Ⅱ1 Junggar Permian Slope, sag Shallow water, Lake basin Lucaogou 2 000-4 000 3 000 100-240 Calcareous mudstone 3.0-12.0 2-50 0.6-1.2 Ⅱ Williston Upper Devonian - Lower Carboniferous Depression Continental, marine basin Bakken 2 600-3 200 50 000 5-49 Shale 3.0-25.0 10-65 0.6-0.9 Ⅱ Gulf Coast Cretaceous Slope Deep water, shelf Eagle Ford 1 000-3 600 40 000 20-60 Mud shale 3.0-7.0 0.7-1.4 Ⅱ Permian Permian Depression Deep water, shelf Wolfcamp, Spraberry 2 200-3 800 520 000 20-150 Shale 2.2-7.2 0.7-1.7 Ⅱ Basin Reservoir Fluid Resource Production Pore Porosity/ % Permea- bility/ 10-3 μm2 Brittle mineral/ % Pressure coefficient Oil visco- sity/ (mPa·s) Oil density/ (g·cm-3) GOR/ (m3·t-1) Water saturation/% Hydrocarbon generation/ 108 t Geological resources/ 108 t Initial production/ well/(t?d-1) Cumulative production/ well/104 t Ordos Nano-pores 1-3 < 0.10 30-50 0.7-0.9 5-20 0.80-0.85 20-100 0 1 300 300-350 1-25 Songliao Nano-pores 2-6 <0.02 40-60 1.0-1.2 20-200 0.82-0.85 50-100 0-15 1 160 250-300 1-8 0.5-1.0 Bohai Bay Nano-pores 2-6 <0.10 40-60 1.2-1.9 10-100 0.67-0.86 50-130 0 1 100 250-300 1-50 0.5-2.8 Junggar Nano-pores 1-3 <0.10 60-90 1.2-1.5 50-120 0.87-0.92 10-20 0 200 30-50 1-20 Williston Nano-pores 4-14 <1.00 50-70 1.2-1.5 0.81-0.83 50-150 450 570 210 1.0-5.0 Gulf Coast Nano-pores 5-10 <1.00 60-90 1.3-1.8 0.82-0.87 200-500 5-15 400 ≈ 500 200 1.0-5.0 Permian Nano-pores 3-12 <1.00 55-85 1.0-1.4 0.78-0.84 100-500 15-25 1000 ≈ 1000 80 1.0-5.7