Velocity analysis method and device of multi-wave seismic data

Abstract

The embodiment of the invention provides velocity analysis method and device of multi-wave seismic data. The method comprises the following steps of: pretreating the multi-wave seismic data; extracting asymptote gathers of common transition points of the pretreated multi-wave seismic data; carrying out initial velocity analysis on the asymptote gathers of the common transition points by utilizing an initial stacking velocity model to obtain an initial stacking velocity parameter; stacking the asymptote gathers of the common transition points by using the initial stacking velocity parameter to obtain a multi-wave stacking profile; carrying out relevant comparison by using a longitudinal-wave stacking profile and the multi-wave stacking profile to obtain an updated longitudinal and transverse wave velocity ratio; updating the initial stacking velocity model by utilizing the updated longitudinal and transverse wave velocity ratio to obtain a final stacking velocity parameter; and acquiring an offset velocity parameter according to the final stacking velocity parameter. Based on the asymptote gathers of the common transition points, the invention carries out velocity analysis by utilizing four parameters so that the velocity analysis can furthest coincide with the actual data.

Description

technical field [0001] The invention relates to the field of oil and gas field exploration, in particular to a velocity analysis method and device for multi-wave seismic data. Background technique [0002] At present, in view of the problem of "low, deep, hidden and difficult" in the exploration and development target area, the proportion of reserve demand is increasing, and geophysical prospecting technology is facing more difficulties and challenges (more blocks of reserves, less individual reserves). Exploration practice has proved that major breakthroughs in oil and gas exploration depend on the progress of geophysical technology, and the development of seismic front technology is of great value. [0003] Multi-wave and multi-component seismic technology is the frontier technology of geophysics development in the world. Since the seismic attribute information that can be provided by multi-wave and multi-component seismic exploration will be multiplied, through the excit...

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Problems solved by technology

[0005] Due to the existing exploration geophysical technology mainly based on single-component longitudinal waves in my country, it is still difficult to meet the needs of exploration and development of subtle oil and gas reservoirs and further increase of reserves and production in mature oil fields in the fields of structural imaging, fracture detection and oil and gas prediction.

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