Abstract:

Dynamics of Fuyang reservoir accumulation in SongliaoBasin are studied. Fuyang reservoir has character of episodic accumulation. Overpressure is not the main force of primary migration but seismic pumping. The oil column height is not associated with the size of overpressure. The episodic reservoir is mainly controlled by regional tectonic movement and faulting. Capillary pressure and buoyancy play an important role in oil secondary migration. Fuyang reservoir has the coexistence of conventional oil reservoirs and deep-basin reservoirs. The organic matching of buoyancy and regional tectonic evolution makes the oil column height obviously increased and makes the reserve abundance improved along the slopes around central depression, nose-shaped structure and anticline. Low overpressure zones in Changchunling can also form reservoir, which is resulted from buoyancy and petroleum lateral migration. Sanzhao, Qijia-Gulong and Changling sags are the focus of deep-basin reservoir exploration. The uplift and slope, northeast and southeast uplift zones with good properties and low overpressure are the further exploration direction s of Fuyang reservoir. It is particularly important that the exploration of Yangdachengzi reservoir should be primarily laid on the slopes surrounding the sag, nose-shaped structure and anticline, instead of large overpressure zone in the central sag.

Key words: reservoir characteristics, controlling factors, the second member of Jialingjiang Formation, eastern Sichuan