When the gas saturation in formation is high, the characters of low neutron, low density, high intervaltransittime and high resistance are obvious;
当地层含气饱和度较高时，有低中子、低密度、高时差及高电阻率特征明显；
3
It is theoretically considered that reservoir gas-bearing makes intervaltransittime porosity and density porosity increase and neutron porosity decrease.