Mobil Oil Corporation

Bonita F Bowman

Keh Pann

Maynard S Redeker

Edward M Lumley

An improved apparatus and method for calculating automatic gain correction to be applied to seismic samples is disclosed which features apparatus and method for calculation of the average absolute value of a window of samples in the vicinity of the sample being processed, the calculation being performed a first time with the window shifted toward a first side of the sample and a second time with the window shifted toward a second side of the sample, and selecting for use in gain correction the minimum of the two calculated average absolute values, such that high amplitude samples in the vicinity of relatively low amplitude events is precluded from causing unrealistic shadowing around such events.

Automatic gain control for seismic data

A method for applying automatic gain control to seismic signals is disclosed which features least means squares fitting the average absolute value of the data in windows of a seismic trace to an exponential function, wherein values for the parameters defining the function are derived and applying a gain function using these parameters to the data.

Automatic gain control in seismic data samples

In seismic exploration, the response characteristics of an array of seismic sources is displayed by contours of equal values of amplitude response as a function of azimuth and dip angle in a stereoscopic polar projection. The projection includes a center point on an axis extending away from the center point representing amplitude response at locations on the line of exploration. Points disposed circumferentially about said axis amplitude response at different azimuth angles from the line of exploration and points at different radial distances from the center point represent amplitude response at different dip angles.

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Arlington, TX, United States of America

Bonita F Bowman