Several issues worthy of attention in current lacustrine shale oil exploration and development

JIN Zhijun,ZHU Rukai,LIANG Xinping,SHEN Yunqi

Table 2 Comparison of geological characteristics of shale oil reservoirs with medium-low maturity and medium-high maturity.

Shale oil type Occurrence state Fluid properties and main clay minerals Development technology Medium-low maturity shale oil Generated residual oil exists in inorganic pores and unconverted organic matter High viscosity, low gas-oil ratio, high wax content, and poor mobility. Mainly kaolinite and montmorillonite. In-situ upgrading is being explored Medium-high maturity shale oil Generated residual oil exists in inorganic pores and organic pores Low viscosity, high gas-oil ratio, and good mobility. Mainly illite. Volume fracturing technology of horizontal well, which is relatively mature