The result of simulation test shows that the shape of the sand body formed in the test changed from leaf shape of the first stage into lobate shape of the fourth stage.This is very similar to the lobate sand body of Sha-1 member in Qibei Sag.The first stage depositional body of the simulation test showed degradation tendency towards source area

the ratio of its thickness to its width reduced graduallys the second stage sand bed distributed extensively

and it connected with the first and the third beds

formed a unified reservoir;the fourth stage sand bed was an isolated lenticle surrounded by argillaceous sediments

its reservoiring property is relatively poor.