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Ocean seismic wave simulation method and system based on index random distribution

A technique of random distribution, simulation methods, applied in the fields of seismology, seismic signal processing, etc. for areas covered by water

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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  • Application Information

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Problems solved by technology

The current horizontal layered model is difficult to describe these characteristics, so it is necessary to carry out the research and application of new methods for marine seismic wave forward modeling

Method used

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  • Ocean seismic wave simulation method and system based on index random distribution
  • Ocean seismic wave simulation method and system based on index random distribution
  • Ocean seismic wave simulation method and system based on index random distribution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 Shown, the inventive method comprises:

[0045] Preparation steps:

[0046] Input data:

[0047] 1. The background velocity of seawater, which is usually a known constant, varies slightly between 1500-1520m / s in different sea areas.

[0048] 2. Exponential autocorrelation function x and z variables describing the disturbance, the unit is meter, describing the spatial scale of the velocity disturbance. According to different values, the influence of inhomogeneity on seismic wavefield propagation can be analyzed, ranging from a few tenths of meters to several meters (for example, 0.1 meters to 9 meters.), this variable is given different values ​​according to different research purposes.

[0049] Step 1: Simulate the seawater medium as a combination of large-scale velocity background field and small-scale velocity disturbance, such as formula (1), and this tiny velocity anomaly can be regarded as a random event, which can be used as a two-dimensional o...

Embodiment 3

[0086] The size of the seawater velocity model is 4000m×3000m, the background velocity is 2000m / s, and the autocorrelation lengths are a=b=1m, for example figure 2 is the seawater velocity exponential random distribution model, from figure 2 It can be seen that the seawater velocity is 2000m / s as the background velocity, and there are random high and low velocity disturbances. Seismic wave forward modeling is carried out on this model, and the seismic records obtained are as follows: Figure 3-1 and Figure 3-2 as shown, Figure 3-1 The exponential random distribution model shown in the forward simulation shows that there are obvious scattered waves under the direct waves and reflected waves, while Figure 3-2 The forward modeling results of the uniform seawater velocity model shown do not show scattered waves, which cannot effectively reflect the phenomenon of seismic wave scattering in seawater. Extract single-channel records for partial zoom-in comparison, such as F...

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Abstract

The invention provides an ocean seismic wave simulation method and system based on index random distribution, and belongs to the field of seismic wave forward modeling simulation in oil-gas exploration and development. According to the ocean seismic wave simulation method based on the index random distribution, a seawater medium is simulated into a combination of a large-scale background field and small-scale disturbance, and an index type self-correlation function is utilized to describe a spatial stationary random process of the small-scale disturbance of the seawater medium, so that a seawater speed model based on the index type random distribution is obtained. According to the method, the hypothesis of a horizontal layer in a conventional method can be overcome, the speed change characteristics of the seawater can be described more truly, and the scattering and attenuation phenomena of seismic waves in the seawater can be effectively reflected.

Description

technical field [0001] The invention belongs to the field of forward modeling simulation of seismic waves in oil and gas exploration and development, and in particular relates to a method and system for simulating marine seismic waves based on exponential random distribution. Background technique [0002] After investigating a large number of detectable literature and patents at home and abroad, and fully understanding and studying the forward modeling method of marine seismic waves, it is found that in the process of forward modeling of marine seismic waves, the seawater medium is usually simply approximated as a horizontally layered homogeneous medium. The speed is usually 3500m / s. In fact, seawater is a complex heterogeneous medium, especially in deep water areas, where there are a large number of suspended particles, such as aerosols, water vapor condensates, bubbles, etc., which make the seismic wave propagation velocity in seawater vary with the position. And it has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/38G01V1/28
CPCG01V1/38G01V1/28
Inventor 齐鹏
Owner CHINA PETROLEUM & CHEM CORP
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