Abstract:

The tectonic features and fault characteristics of the saddle in northern Putaohua oilfield are described, and the controlling factors on hydrocarbon accumulation, including the matching of forming time of structural traps with hydrocarbon expulsion, distribution of sand body, formation pressure and fault sealing, are analyzed in this paper. The results indicate that oil generation and expulsion matched well with structural traps, lower formation pressure and the fault which is parallel migration path of oil are advantages of hydrocarbon accumulation in saddle of northern Putaohua oilfield. The hydrocarbon accumulation is controlled by tectonic features and distribution of sand body. It is the potential extension area for its good conditions of hydrocarbon accumulation.

Key words: hydrocarbon accumulation, distribution of sand body, fault sealing capacity, Putaohua oilfield, Songliao Basin