Discovery and resource potential of shale oil of Chang 7 member, Triassic Yanchang Formation, Ordos Basin

doi:10.3969/j.issn.1672-7703.2021.05.001

Abstract

Abstract: The discoveries, theoretical and technical progress of shale oil exploration of the 7th member of Triassic Yanchang
Formation (hereinafter referred to as Chang 7 member) are summarized during the 13th Five-Year Plan period. The resource potential is predicted, and the exploration targets are proposed during the 14th 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 5×108 t preliminarily been defined in the peripheral lake basin; In addition, promising 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
liquid hydrocarbon 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 the 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 technologies, 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 13th 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 of Changqing Oilfield
Company.

CLC Number:

TE122.1

Fu Jinhua, Liu Xianyang, Li Shixiang, Guo Qiheng, Zhou Xinping, Yang Weiwei. Discovery and resource potential of shale oil of Chang 7 member, Triassic Yanchang Formation, Ordos Basin[J]. China Petroleum Exploration, 2021, 26(5): 1-11.

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