Patent ID: 6401042
Filing Date: 2002-06-04
Classification: G01V

Abstract:
A method of determining and analyzing spatial changes in the earth's subsurface and of reducing noise in seismic data, comprising the steps of:a) obtaining seismic data; b) obtaining an earthmodel of the subsurface with layers representative of the subsurface structure; c) defining a set of microlayers defined by a set of microlayer horizons between the layer boundaries of the earthmodel; d) determining microlayer horizon grid points along a microlayer horizon; e) determining the seismic data amplitudes at the microlayer horizon grid points; f) determining at each microlayer horizon grid point one or more measures representative of the rate of change of the seismic data amplitudes and/or measures of the direction in which the seismic data amplitudes change and/or determining at each microlayer horizon grid point one or more filter outputs; and g) storing as output data items said seismic data amplitudes, said measures and said filter outputs at each microlayer horizon grid point for further analysis of the subsurface.