Shale oil resources in the Subei Basin show significant potential. The second and fourth members of the Funing Formation (hereafter referred to as Funing Member 2 and Funing Member 4) are the main target layers for exploration. These layers are characterized by substantial thickness

wide distribution

high content of brittle minerals

well-developed laminated structure

and favorable organic matter types

with typical geological features

including low to medium total organic carbon (TOC)

complex tectonics and lithology

and developed faults/fractures. Since 2011

Jiangsu Oilfield has strengthened basic research and exploration practices

leading to the establishment of the theory of differential enrichment of shale oil in complex fault blocks with low to medium TOC. Key technologies for exploration and development have been integrated and innovated

green and low-carbon development models have been explored

and significant breakthroughs have been achieved in shale oil exploration of Funing Member 2 and Funing Member 4 in the Gaoyou Sag. However

there are still many challenges

such as an unclear understanding of the patterns of shale oil enrichment and high yield

insufficient adaptability of engineering technologies

undefined technical policies for cost-effective development

and high development costs. Main approaches to achieving large-scale production and cost-effective development of shale oil include: deepening the fundamental research on the main controlling factors of shale oil enrichment and high yield

tackling main challenges and advancing key technologies

optimizing integrated organizational management and operation mechanisms

and maximizing the drilling success rate in high-quality reservoirs

the utilization rate of shale oil reserves

and the recovery efficiency to further reduce costs and improve efficiency.