Abstract:

The theories on high-resolution sequence stratigraphy were applied to the systematical recognization and correlation of the sequence stratigraphic units of different orders for the Upper Cretaceous to Paleogene in the Biyang Depression and to the establishment of correlation frameworks for sequence stratigraphic units of each order.We identified several favorable hydrocarbon reservoir types,including the complex fault block reservoirs of the high-stand prograde delta in the northern slope zone,the fault-lithologic reservoirs in the low-stand fan of the hinge zone in the northern slope,the lenticular reservoirs in the slump turbidite and sublacustrine fan in the deeply-sagged area,and the lithologic reservoirs in the southern steep slope zone.Based on these discoveries,we studied the various trap types developed in the northern slope zone,deeply-sagged area and the southern steep slope zone and carried out research on their seismic recognition and prediction.Many subtle reservoirs were identified through seismic prediction and proved through drilling.

Key words: seismic inversion, reservoir prediction, sequence stratigraphy, complex trap, the Biyang Depression