Abstract: To address the problem of unclear hydrocarbon distribution pattern in Saertu, Putaohua and Gaotaizi reservoirs near Aogula Fault, the favorable hydrocarbon transport site of Aogula Fault and its influence on hydrocarbon accumulation in different periods were studied with the description of the favorable sites for hydrocarbon transport by associate fractures and by convex ridges, based on the study of the relationship between the development of Aogula Fault and the hydrocarbon distribution, and the hydrocarbon distribution of Saertu, Putaohua and Gaotaizi reservoirs near Aogula Fault. The results of the study showed that Aogula Fault was developed with favorable sites for hydrocarbon transport by associated fractures in Saertu, Putaohua and Gaotaizi reservoirs, except for east and west ends and the central part; Aogula Fault had seven favorable sites for hydrocarbon transport by convex ridges in Saertu, Putaohua and Gaotaizi reservoirs, including three sites in its central and central-western parts, and only one site in the east; the relationship between the favorable hydrocarbon transport site of Aogula Fault and hydrocarbon accumulation in Saertu, Putaohua and Gaotaizi reservoirs during different periods was mainly manifested by the hydrocarbon transport jointly by associated fractures and convex ridges, resulting in the greatest hydrocarbon accumulation in Saertu reservoir; the contribution of transport by associated fracture to hydrocarbon accumulation was greater than that of transport by convex ridges. The study correctly revealed the hydrocarbon distribution pattern in the Saertu, Putaohua and Gaotaizi reservoirs near Aogula Fault, with a guiding significance for the further hydrocarbon exploration of Saertu, Putaohua and Gaotaizi reservoirs.

Key words: hydrocarbon transport, favorable site, hydrocarbon accumulation, Aogula Fault, Saertu, Putaohua and Gaotaizi reservoirs, Songliao Basin