Abstract:

In order to study the formation conditions of the different reserve abundance of gas reservoirs quantitatively, main controlling factors for formation of gas reservoirs, formation conditions of gas reservoirs and reserves abundance are studied by dissection of gas reservoirs and matching relations among accumulation conditions of gas reservoirs, and concluded supply gas capacity of source rock, transporting gas capacity of fault and seal and preservation ability of gas reservoirs are 3 main controlling factors for formation of gas reservoirs. K₁sh rock supply capacity of source is mainly better and bad grade, transporting gas capacity of faults is mainly good grade and seal and preservation capacity of gas reservoirs is also mainly good. The comprehensive evaluation of gas reservoirs formation conditions was mainly in middle grade, secondly in good grade, the least in bad grade. Gas reserves abundance is mainly middle grade, and high and low abundance is less. Relationship between comprehensive evaluation value for the formation conditions and gas reserves abundance was considered to have a direct. To form gas reservoirs with high reserves abundance, comprehensive evaluation of gas reservoir formation conditions should be good, and to form gas reservoirs with middle reserves abundance, comprehensive evaluation of gas reservoir formation conditions should be middle.

Key words: Xujiaweizi depression, reserves abundance, gas reservoir, supply capacity of source rock, transporting capacity, seal and preservation capacity, petroleum gas