Method for constructing fault three-dimensional structure based on seismic distribution characteristics

Abstract

The invention discloses a method for constructing a fault three-dimensional structure based on seismic distribution characteristics. The method comprises the following steps of firstly, collecting geological information of an area where a target fault is located; discretizing the target fault plane into a plurality of sub-fault planes, assuming that seismic events occur on the sub-fault planes, taking the horizontal distance between a seismic source and the sub-fault planes as an error, and obtaining a model equation of each sub-fault plane by using a least square method; taking the midpoint of each sub fault surface as a grid point of a final result to obtain a three-dimensional structure model of the target fault; and obtaining three-dimensional structure features of the target fault based on the collected geological information and the three-dimensional structure model of the target fault. According to the method, the three-dimensional fine structure of the fault zone can be economically and effectively depicted so that research on scientific problems such as a geological structure evolution process, earthquake risk assessment and an earthquake pregnancy mechanism is facilitated, and the method has important theoretical and practical significance.

Description

technical field [0001] The invention relates to the technical field of geological disaster research, in particular to a method for constructing a three-dimensional fault structure based on earthquake distribution characteristics. Background technique [0002] At present, earthquakes occur frequently in areas with active faults, and they face a high risk of earthquake disasters. Obtaining high-resolution and high-precision 3D structures of active faults is helpful for scientific issues such as earthquake risk assessment and research on earthquake seismogenic mechanisms. Reliable models that advance earthquake science. Seismic methods for studying fault structures in the prior art mainly include natural seismic imaging methods and active source seismic methods, but the above two methods are time-consuming, costly, and lack fine characterization of the three-dimensional structure of faults. There are also researches on the method of constraining the fault shape according to th...

AI Technical Summary

Problems solved by technology

[0003] However, the constraints on the fault plane in the above studies are limited to the horizontal direction. Although there is also a plan to use seismicity data to fit the fault structure in layers and segments, and to constrain it in the vertical direction of the fault, the fault constructed by this plan has sub-faults. There are large differences in levels, and it is impossible to give an intuitive three-dimensional structural model of the main fault, and it is also impossible to judge the locking characteristics of fault partitions

Images