Abstract:

The diffluence channel sand bodies of K₂-K_1-3 key horizones placed on the bottom of Pliocene lower Youshashan Formation in Youshashan Oilfield,Qinghai have developed into a deltaic labyrith reservoir frame. The frame prototype of outcropped sand bodies may be considered as the evidence in establishing underground prediction model.This means that data obtained from outcrops of the sand bodies including reservoir structure,the density and geometry(the ratio of width to thickness)of the sand bodies,regional paleocurrent direction,the ratio of total areas of prototype frame models of outcrops,the ratio of the area for sand bodies with different thickeness were used to establish the predictive transverse model, predictive plane model and permeabality model of the sand body frames.According to the prediction results.half of the reservoiring sand bodies have ever beed drilled yet.