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

Claim 9:
10. A fault characterization system for precise navigation of deep oil and gas based on image fusion characterized in that the system comprises:
a seismic data pre-processing module is configured to acquire an original seismic data, conduct a spectral shaping on the original seismic data to obtain a reshaped seismic waveform data, and conduct a diffusion filtering and a dip filtering on the reshaped seismic waveform data to obtain an enhanced seismic data;
an amplitude gradient image acquisition module is configured to obtain an amplitude gradient image by calculating an amplitude gradient vector;
a dip attribute image acquisition module calculates a dip attribute image based on the enhanced seismic data;
a gradient amplitude attribute fault confidence region acquisition module is configured to obtain a gradient amplitude attribute fault confidence region through an ellipsoidal expansion method;
a dip attribute data volume acquisition module for defining a fault position is configured to multiply a dip attribute image with the confidence region of the fault irregularly to obtain a dip attribute data volume for defining the fault position;
an image fusion module is configured to fuse the gradient amplitude attribute fault confidence region with a dip angle attribute data volume that defines the fault position through a hierarchical wavelet transform method to obtain a superimposed fault attribute map;
a branch fault scoring module is configured based on the superimposed fault attribute map, dividing a bead-like structure; based on a center point position of the bead-like structure, a number of bead data points within a set bead distance range is recorded as a score of branch fault data points;
a fault area analysis module is configured to determine whether the score of the branch fault data points is greater than a preset dominant fault score threshold, identify a part that is greater than the preset dominant fault score threshold as a dominant fault area, and identify a part that is less than a preset advantage fault score threshold as a non-dominant fault area;
a scale replacement module is configured to set different bead distance ranges, and repeat the content of the branch fault scoring module and fault area analysis module to obtain graded dominant fault areas.