Correlation Function Behavior in Productive and Nonproductive Layers

Mathematical technique based on the expansions of elasticity modulus fluctuations into the Fourier<br>series is applied to field data obtained at the seismic frequency in order to calculate the 3-D spatial correlation<br>functions for elasticity tensor components. The results of calculations show the existence of maximum<br>amplitudes and minimum of correlation radius of the correlation functions associated with enhanced<br>inhomogeneities at some depth. It is observed that these depths well correlate with oil and gas location indicated<br>by other independent methods. It is shown that the experimental correlation functions cannot be fitted with<br>accepted accuracy by spherical Gaussian functions.