Analysis of Main Controlling Factors for Lithologic Reservoirs of the Fuyu Oil Layer in Honggangbei Area

摘要

Through the research on types and characteristics of lithologic reservoirs of Fuyu oil layer in Honggangbei area, Songliao Basin, such types of lithologic reservoirs is identified from up-dip pinch-out sandstone reservoirs, abandoned channel screened reservoirs, local-oscillation channel sandbody reservoirs, fault-lithologic reservoirs, fault-structural nose reservoirs. Its characteristics are complicated distribution of oil and water, rapid lateral change of reservoirs and monosandbody pool-controlling. Through fine dissection of developed reservoirs, the results show that genetic monosandbody traps are minim oil-controlling units, oil-accumulating units and main controlling factors for lithologic reservoirs of Honggangbei, which it is controlled by vertical layer and planar sedimentary microfacies. Spatial complicated superposition of vertical multi-layer and planar multi-branch monosandbody traps and mis-traps is essential reason of complicated distribution of oil and water.