Abstract:

The Upper Paleozoic of north Ordos Basin is an independent gas system with a complete source reservoir cap rock assemblage.Gas generation centre along Wushen Flag is characterized by large distribution area,big gas generation intensity and abundant gas resources.Sandbodies deposited in rvier channels,fan deltas and tidal flat are favourable for the formation of larg and mid scale traps;the source-reservoir-cap rock assemblage within the same stratum is favourable to form gasfield;large and mid scale sandbodies at the higher part of the gas generation centre are suitable for gas migration and accumulation.Trap types of the study area are mainly lithologic and structural-lithologic traps.It is suggested that Xinjie-Wushen Flag-Hongshiqiao in the east section of Yishaan Slope,the south part of Hangjing Flag fault terrace and Tianhuan Depression are the targets for gas exploration.

Key words: Upper Paleozoic, accumulation regularity, lithologic trap, exploration target, Ordos Basin