Earthquake forward modeling method applicable to non-uniform motion water bodies

Abstract

The invention provides an earthquake forward modeling method applicable to non-uniform motion water bodies. The method comprises the steps that firstly, data, observation systems and hypocenter parameters related to seawater and strata are acquired; secondly, starting from the mass conservation equation, the Euler equation and the adiabatic state equation, through an asymptotic method and a suitable assumption based on the seawater practical conditions, a first-order stress-velocity equation suitable for the non-uniform motion water bodies is derived; thirdly, a reasonable boundary condition is given; finally, a control equation and the boundary condition are discretized through high-precision finite difference, and the propagation process of seismic waves in the seawater and seabed elastic media is simulated. According to the method, the influences of the density, sound velocity and flow velocity in the seawater on propagation of the seismic waves are comprehensively considered, the propagation condition of the seismic waves in a complex marine environment can be truly reflected, and the method has high application value in marine oil-gas exploration, especially deepwater oil-gas exploration in the complex marine environment.

Description

technical field [0001] The invention belongs to the field of marine seismic exploration, in particular to the field of deep water oil and gas exploration, and relates to a seismic wave simulation method for complex marine environments. Background technique [0002] Improving the precision of seismic imaging in deep water areas to obtain the true depth structure map of exploration targets is of great significance to the development of deep sea oil and gas fields. However, there are still many problems in deep-water seismic imaging, among which the extremely complex environmental conditions of the deep-sea ocean is one of the main factors. Mesoscale phenomena such as mesoscale eddies, internal waves, and ocean fronts exist in seawater. Observational data found that when seismic waves pass through deep waters, mesoscale phenomena will be reflected in seismic data from time to time (Biescas et al., 2008; Song et al., 2008; Ruddick, 2003; Pinheiro et al., 2010), and these non-un...

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Problems solved by technology

Therefore, in order to comprehensively study the influence of the complex ocean environment on seismic exploration, the seabed strata cannot be simply treated as acoustic layers.

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