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In view of poor understanding of the tectonic development pattern and hydrocarbon accumulation law in Damiao Sag, Erlian Basin, the tectonic development pattern, reservoir development mode, and hydrocarbon accumulation law and high yield of Damiao Sag, Erlian Basin were studied based on the sedimentary facies study and logging-seismic joint inversion technology, so as to determine the resource potential and favorable target areas of Damiao Sag, Erlian Basin. The study results show that alluvial fan - fan delta - lake sedimentary system is mainly developed in the early stage of Damiao Sag; the glutenite in the alluvial fan, the fine sandstone in the remote distal bar and the glutenite in the shallow lake are developed with excellent reservoirs, and the semi-deep and deep lake mudstone is developed with good source beds; the favorable hydrocarbon accumulation is mainly distributed around hydrocarbon-rich sags, and Ai'ershan Formation and Member 1 of Tengge'er Formation are selected as the favorable exploration targets in Damiao Sag, Erlian Basin, with an estimated resource of 150. 44x104t, one well deployed, and an expected production capacity of 10 t/d. The study results are of great significance for the development of replacement areas of favorable oil and gas resources in Erlian Basin. [ABSTRACT FROM AUTHOR]