gas in tight sand
Tight sandstone gas is abbreviated as tight gas. The natural gas distributed in tight sandstone refers to the reservoir rock where the tight gas is located with low porosity (<10%) and low permeability (<0 5×10. Square microns or <0 1×10 .3 square microns), low gas saturation (<60%), high water saturation (>40%), natural gas in the sandstone layer with a slower flow rate of natural gas in the sandstone layer. Tight gas extraction requires fracturing technology, which has a high cost of extraction and is sometimes classified as unconventional natural gas.