# Translations:Seismic deconvolution/2/en

An oil well drilled in a sedimentary basin will reveal the layering of sediments. When a wave of unit energy strikes an interface between two layers, some of the energy is reflected, and the remainder of the energy is transmitted. The amount of reflected energy depends on the reflection coefficient of the interface. If we plot the reflection coefficients of all these interfaces as a function of two-way traveltime, we obtain the so-called reflectivity function. This reflectivity gives vital information about the geologic structure. In the ideal case of distinct, well-defined layers, this reflectivity function would consist of a pip at each interface. The size of such a pip would be equal to the value of the reflection coefficient at that interface. The magnitudes of most reflection coefficients encountered in petroleum exploration are small, generally much smaller than one. For the simplified case of no multiples and no transmission losses, a powerful model of the reflection seismogram can be obtained by attaching the source wavelet to each pip on the reflectivity function.