Abstract：The Songliao Basin has a large amount of shale oil resources, and many wells have obtained industrial oil flows in shale layers of the Qing 1 member, which shows a positive prospect for shale oil exploration. In this paper, existing seismic and well logging data are used to study the geological characteristics of the mud shale series in the Qing 1 member in the southern Songliao Basin, and the prospect of shale oil exploration in this area is further analyzed. The following understandings are obtained:① There is a correlation between the enrichment of shale oil in the Qing 1 member in the southern Songliao Basin and the torsional structure, and zones with a distance of 0.5~1.5 km from the torsional zone are the most favorable; ② Reservoirs in the Qing 1 member have a porosity of 2%~6% and a permeability of 0.01~0.50 mD, and the development of the reservoirs is mainly controlled by depositional environments and organic matter maturity. The reservoirs can be divided into mud shale reservoirs and mud shale + thin sand layer reservoirs; ③ The kerogen in the source rocks in the Qing 1 member belongs to type I-II1, and the RO value is 0.5%~1.2%. The TOC value is 1.0%~5.0%, and the area with a TOC value greater than 2% on the plane is 10500km2. The favorable zones for shale oil exploration are Qian'an and Da'an sub-sags, which can be divided into five favorable exploration zones.
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