Earthquake speed disturbance modeling method for well-free earthquake reversion

A technology of seismic inversion and modeling methods, which is applied in the direction of seismic signal processing, etc., can solve the problems of modeling difficulty and achieve the effect of effective and rapid modeling

Inactive Publication Date: 2015-10-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned modeling method is generally used in areas with wells. However, for many new exploration areas, such as the deep water area of ​​the South China Sea, the water depth is about 2000ms

Method used

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  • Earthquake speed disturbance modeling method for well-free earthquake reversion
  • Earthquake speed disturbance modeling method for well-free earthquake reversion
  • Earthquake speed disturbance modeling method for well-free earthquake reversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 Comparison of bandpass inversion results under different background models shown, the left picture shows the model Den2=310*vp**0.25, vp / vs=2.1, and the right picture shows the model Den2=310*vp**0.25, vp / vs =1.9, after comparing the results of bandpass inversion, it can be concluded that the two inversion results describe the sand bodies basically the same.

Embodiment 2

[0044] Such as figure 2 Comparison of bandpass inversion results under different background models shown, the left picture shows the model Den1=124*vp**0.368, vp / vs=2.1, and the right picture shows the model Den2=310*vp**0.25, vp / vs = 2.1, after comparing the bandpass inversion results, it can be concluded that the two inversion results have basically the same delineation of sand bodies.

Embodiment 3

[0046] Such as image 3 The comparison of bandpass inversion results and absolute inversion results under the same background model shown, the models on the left and right are the same, both are Den1=124*vp**0.368, vp / vs=2, and the left picture is the band Through the inversion results, the picture on the right is the absolute inversion result. After comparison, it can be concluded that the description of the sand body by the two inversion results is basically the same.

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Abstract

The invention discloses an earthquake speed disturbance modeling method for well-free earthquake reversion. The method comprises the following steps: obtaining a longitudinal wave model vp of a deep-water well-free work area, and calculating a transverse wave model vs by taking a background mud stone vp/vs as a constant; according to experience information of the deep-water work area, selecting a constant from a scope of [1.90-2.10] for the vp/vs, selecting a starting point value starting from vp/vs=1.90, carrying out disturbance change according to a mode that a set step length is sequentially increased, forming a vp/vs model array taking the set step length as an interval, and accordingly, obtaining the transverse wave model vs of disturbance corresponding to each progressively increased number; and solving a density model den, a longitudinal wave impedance model zp and a transverse impedance model zs, and taking the multiple models as input of a reversion model for reversion. The method provided by the invention has the following advantages: the operation is simple, the modeling is convenient, the accuracy and the reliability are high, the practicality is high, the modeling is carried out by reliance on a disturbance method of a speed field, a stable reversion result is obtained, and the modeling is realized effectively and rapidly.

Description

technical field [0001] The invention relates to a modeling method, in particular to a seismic velocity disturbance modeling method for seismic inversion without a well, which belongs to the seismic inversion modeling technology of petroleum exploration. Background technique [0002] Seismic pre-stack synchronous inversion technology is often used to identify reservoirs and detect hydrocarbons. The so-called pre-stack synchronous inversion refers to the joint inversion of different offset gather data and P-wave, shear-wave, density and other logging data to obtain the It is a new technology for comprehensively judging reservoir physical properties and oil and gas properties based on a variety of elastic parameters related to gas-bearing properties. Currently, there are two mainstream pre-stack synchronous inversion methods: model-based pre-stack synchronous inversion and seismic trace-based pre-stack synchronous inversion. [0003] Before inversion, these two types of method...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 梁立锋张宏兵
Owner HOHAI UNIV
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