The decision analysis of the traps of the upmost Ordovician weathering crust in the north area of Yishaan slope

Ordos Basin indicates that among the 10 traps represented by relict tables

unakas

the traps of No.11

No. 8

No. 6-7 and No. 4 have relatively large cumulative areas

richer gas resources

higher economic benefit

lower critical probability

higher probability for the first well to be the discovery well

and these traps are more prospective in gas exploration. The traps of No. 15 - 13 are secondary: traps No. 14 and No. 9 are the last.