The diffluence channel sand bodies of K

2

-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.