Abstract:

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.