Abstract: Applying mutiple cross plot combined with the well-log data of neutron, density, compressional wave, shear wave, neutron-gamma and repeat formation testing for the first time, this paper summrizes and draws up ten-odd technic methods which can identify natural gas reservoir rapidly and directly, and obtain better effects. These methods can be popularized.

Key words: Junggar basin, Natural gas, Reservoir, Well-logging, Interpretation, Cross plot