Abstract:

The central uplift of Ordos Basin is located in Wuqi-Qingyang-Fuxian region and could be divided into steep slope area in the west flank,eroded area in central uplift,gen-tle slope area in the east flank,gentle slope in the north flank and steep-gentle changing area in the south flank.The uplift underwent Pre-Caledonian,Caledonian,Hercynian,Yenshan and etc.evolution periods.The uplift is close to two gas generation centers of Or-dovician,Permo-Carboniferous Systems,which provide rich gas-sources for the east flank slope area,thus the uplift is favourable in seeking for weathered-crust and other subtle traps.The bauxite of Middle Carboniferous Benxi Formation can be direct seal,and Per-mian argillaceous rocks may act as regional seals.Hence Jingbian-Zhidan-Fuxian area in the east flank of the uplift is most favorable for gas exploration,then Dingbian-Tianchi,the west steep slope is the reserve area.