| China | Faulted basins, inland depression basins (Junggar, Ordos, and Songliao Basin, etc.) | Continental facies (featuring fast changes in lithology and lithofacies, unstable distribution, strong heterogeneity, and poor connectivity) | With mainly medium-low maturity and locally high maturity, they have poorer oil-bearing pro-perty than marine shale strata and lower pressure | The oil has high viscosity, high wax content, poor mobility, and poor recoverability. | With contents of clay minerals varying widely, they differ greatly in fracability | Being explored now |
| North America | Stable Craton basins and foreland basins (Permian, Williston Basin, etc.) | Marine facies (with stable lithology and lithofacies, contiguous distribution in a large area, developed micro-nano pores and fracture systems, and good connectivity) | With medium to high maturity, the strata have good oil-bearing property, high oil content, and high formation pressure. | With low viscosity, high gas-oil ratio,
and good mobility, the oil has good recoverability. | With low clay mineral contents, they have good fracability | Relatively mature horizontal well + multi-stage volume fracturing technologies |