Structure-independent analysis of 3-D seismic random noise

摘要

A system and method identify and display random noise in three dimensional (3-D) seismic data utilizing a 3-D operator to reduce the effects of seismic structure on noise identification. The 3-D operator is derived using statements of required performance in 3-D. The 3-D operator is applied on a pixel-by-pixel basis to each of the pixels in the 3-D post-stacked data to display images in a 3-D display or to output an estimate of noise that is substantially independent of the image structure. The resulting display is generated in colors to indicate noise amplitude to facilitate location of noisy regions in the original display.

主权项

1. A method for identifying and displaying random noise from a post-stacked 3-dimensional seismic image using a computer system having a processor, the method comprising the steps of:
inputting into said processor data which represents a first 3-dimensional seismic image, wherein said image includes an image structure and noise, and wherein said image is divided into a plurality of pixels each having a value; programming said processor with the following 3-dimensional mask:mask=(1-21-24-21-21),(-24-24-84-24-2),(1-21-24-21-21),where 1, −2, 4, and −8 represent coefficients of the mask having the properties of being zero sum and symmetrical;
applying the 3-dimensional mask to each pixel of the received seismic image data using the processor executing a predetermined image processing program, to generate a new 3-dimensional image in which image structure is suppressed such that the new, 3-dimensional image represents noise from the first 3-dimensional seismic image; and displaying the new 3-dimensional image on a display device.