Plane profile rapid fault interpretation method

Abstract

The invention discloses a plane profile combined rapid fault interpretation method. The method comprises the steps of: 1, performing horizon interpretation at a well passing point; 2, interpreting horizon line interpolation as a horizon trend surface; 3, opening a time window on the horizon trend surface to extract coherent attributes; 4, extracting a plane fault line in a plane range according tothe coherence attribute; 5, selecting a two-dimensional seismic section in the range of the plane fault line, and explaining the fault line in the two-dimensional seismic section, wherein the plane fault line and the section fault line intersect to form a plane; and 6, taking the horizon fault intersection point as a rotation point in the sections, performing rotation angle scanning on the projection fault line of the fault surface, adjusting the fault line to a fault scanning angle position corresponding to the maximum entropy, and traversing all the sections to obtain a finely interpreted fault surface. Coherent attributes are extracted on the basis of an initial trend surface, the coherent attributes are used as guidance, a manual interpretation plane fault line and a manual interpretation section fault line are used for rapidly intersecting to form a surface, and fault interpretation can be rapidly, conveniently and visually carried out.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for interpreting a plane section combined with a rapid fault. Background technique [0002] In the process of oil and gas exploitation and seismic interpretation, accurate and reasonable fault interpretation is the core of seismic structural interpretation. The intuitive reflection of faults on the vertical section is wave group dislocation, distortion, and sudden changes in amplitude and frequency, which are reflected on both sides of the fault. Different strata occurrence, uncoordinated structural deformation, different stratum thickness and other characteristics. [0003] At present, the methods of fault identification and interpretation include: fault interpretation method for seismic profile identification and well breakpoint identification; fault identification method for coherent attributes; automatic fault tracking and identification method for in...

AI Technical Summary

Problems solved by technology

Among them, the seismic section fault identification method is mainly based on the reflection characteristics of faults on the seismic section to manually identify faults, which is suitable for 3D seismic data, and its identification effect is greatly affected by the resolution of seismic data and the subjective experience of interpreters. Cooperate with the method of breakpoint guidance for fault identification; while the coherent attribute fault identification method is simple and fast, but the difference in coherence is not necessarily caused by faults, so there are errors in the coherent fault identification method, and post-processing judgment is required for the coherent body; intelligent The widely used branching method in the fault automatic tracking and identification method of the algorithm is the ant tracking method. The result of the ant tracking fault detection, the fault line is clear and the continuity is good, and it can identify small faults that cannot be recognized by the naked eye. The calculation results of the ant tracking are fine However, the amount of calculation is large, and it is easily disturbed by linear noise; the method of image processing and fault interpretation has multi-scale, but the fault detection results are greatly affected by the quality of seismic data filtering and attribute extraction

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