Patent ID: 11860326
Assignee: INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A fault characterization method for precise navigation of deep oil and gas based on image fusion is characterized in that the method comprises:
step S100, acquires an original seismic data, conducts a spectral shaping on the original seismic data to obtain a reshaped seismic waveform data, and conducts a diffusion filtering and a dip filtering on the reshaped seismic waveform data to obtain an enhanced seismic data;
step S200, based on the enhanced seismic data, obtains an amplitude gradient image by calculating an amplitude gradient vector;
calculates a dip attribute image based on the enhanced seismic data;
step S300, based on the amplitude gradient image, obtains a gradient amplitude attribute fault confidence region through an ellipsoidal expansion method;
by multiplying the dip attribute image with the confidence region of the fault irregularly, a dip attribute data volume with limited fault location is obtained;
step S400, fuses the gradient amplitude attribute fault confidence region with a dip angle attribute data volume that defines a fault position through a hierarchical wavelet transform method to obtain a superimposed fault attribute map;
step S500, based on the superimposed fault attribute map, divides a bead-like structure;
based on a center point position of the bead-like structure, number of bead data points within a set bead distance range is recorded as a score of branch fault data points;
step S600, determines whether the score of the branch fault data points is greater than a preset dominant fault score threshold, identifies a part that is greater than the preset dominant fault score threshold as a dominant fault area, and identifies a part that is less than a preset advantage fault score threshold as a non-dominant fault area;
step S700, sets different bead distance ranges, and repeats step S500 to S600 to obtain graded dominant fault areas.