Abstract:

At present, developing of natural gas goes into the devoping climax. Based on the analysis in flourish developing natral gas industry and reasonable economic evaluation about somdifferent of types gas reservoir and combined to general rule athe character of benefit change, the analysis method of economic benefit of different development stage has been put forwa
and the mathematics model which can provide the basis of tdevelopment plan for gas field has been made. In this pape four questions which serve decision making of natural gas devopment and improve economic benefit in the natural gas fiewhich are exploration investment, gas cost ,economic outp and gas price have been expounded and proved.

Key words: economic evaluation, exploration investme, economic output, natural gas price