In order to quantitatively characterize the spatial and temporal distribution characteristic of superimposed reservoir sandbodies

drilling core data

logging data

and test data are integrated to analyze the superimposeition relationship and sandbodiesbody size of the Upper Palaeozoic in Gaoqiao region of Ordos Basin. The superimposition styles of sandbodies in the Shanxi-Xiashihezi formations in the study area include scouring-cutting type（ truncated channel sandbodies）

scouringcontact type（ complete channel sandbodies） and continuous transitional contact type（ isolated channel sandbodies）. Distributions of sandbodies formed in different periods are different. Sandbodies in the Shanxi Formation are relatively narrow

showing a banding distribution. In contrast

the very thick sandbodies consisting of superimposed distributary channels of multi-stages in the 8thmember of the Shihezi Formation feature in laterally continuous and large scale distribution. Based on core measurement

we calculated the channel water depth range of bankfull stage

single sandbody thickness

single channel width and river width in the 2ndmember of Shanxi Fm

the 1stmember of Shanxi Fm and the 8thmember of Shihezi Fm. The rivers in meandering river delta in the 2ndmember of Shanxi Fm has a width of 700- 1 500 m

the rivers in meandering river delta in the 2ndmember of Shanxi Fm has a width of 600- 1 200 m

and the braided rivers in the upper and lower 8thmember of Shihezi Fm have a wide of 1 000- 2 000 m and 750- 1 600 m respectively.