The normalized IP decay signal is a superposition of IP signal from individual pore and can be inversed to a relaxation time spectrum.The spectrum is very useful to characterize the reservoirs.

• 衰减谱是一系列单指数衰减的线性叠加，因此，可以对衰减谱进行多指数反演，得到弛豫时间谱，从而可以更好地利用激发极化衰减谱来进行储层评价。