Abstract: The exploration results, theoretical and technical progress of shale oil in Chang 7 member of Triassic Yanchang Formation are summarized during the 13^th Five-Year Plan period, resource potential is analyzed, and the exploration targets proposed during the 14^th Five-Year Plan period. There are four types of shale oil in Ordos Basin, including gravity flow interlayered type, delta front interlayered type,laminar shale type and laminated shale type. Among them, a one-billion-ton-level Qingcheng Oilfield has been discovered in the central lake basin, and large-scale reserves of 5×10⁸t been preliminarily identified in the peripheral lake basin; In addition, new signs have been observed in the risk exploration of laminar shale type shale oil. The study results show that high-quality source rocks supply a large amount of hydrocarbon fluids for shale oil enrichment. Multiple types of reservoir space and continuous high-pressure charging caused by hydrocarbon generation pressurization inside the source rock are the key to large-scale oil accumulation and high yield of sweet spots. The widely developed sandy deposits in deep water areas are sweet spots for shale oil exploration. A series of supporting technology, such as comprehensive evaluation technology of geological-engineering sweet spots, anti-collapse fast and optimal drilling and completion technology of cluster horizontal well,and “advanced energy storage and subdivision cutting” volume fracturing technology of horizontal well, are important guarantees for the discovery of large-scale shale oil reserves. The fruitful exploration results achieved during the 13^th Five-Year Plan period support to strengthen
the confidence in expanding the scale of gravity flow interlayered type shale oil enrichment area in the central lake basin and exploring new fields of delta front interlayered type shale oil in the peripheral lake basin. Meanwhile, new supporting technology is actively researched, so as to provide a solid resource foundation for the high-quality and rapid development of shale oil exploration in Changqing Oilfield .