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Pre-stack seismic inversion method and system thereof

A pre-stack seismic and pre-stack inversion technology, applied in the field of petroleum geophysical exploration, can solve problems such as large errors

Active Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the absence of the density item improves the stability of the inversion, it also introduces a large error

Method used

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  • Pre-stack seismic inversion method and system thereof
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  • Pre-stack seismic inversion method and system thereof

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no. 1 example

[0052] figure 1 is a flow chart of the pre-stack seismic inversion method according to the first embodiment of the present invention. The following reference figure 1 Each step of this method will be described in detail.

[0053] Step S101 : Calculate the corresponding longitudinal wave impedance reflection coefficient, shear wave impedance reflection coefficient and density reflection coefficient based on the initial longitudinal wave impedance model, shear wave impedance initial model and density initial model respectively.

[0054] First, the initial model of the longitudinal wave impedance, the initial model of the shear wave impedance and the initial density model are denoted as Z p ,Z s , ρ, and calculate the natural logarithms of these three initial models respectively, as shown in expression (1):

[0055] L p =ln(Z p ), L s =ln(Z s ), L ρ = ln(ρ) (1)

[0056] Then, the longitudinal wave impedance reflection coefficient, the shear wave impedance reflection coe...

no. 2 example

[0106] Figure 8 is a schematic structural diagram of the pre-stack seismic inversion system according to the second embodiment of the present invention. Refer below Figure 8 To illustrate the composition of each part of this embodiment.

[0107] Specifically in Figure 8 Among them, the first module 81 of this embodiment executes the operation of step S101 of the first embodiment, the second module 82 executes the operation of step S102 of the first embodiment, and the third module 83 executes the operation of step S103 of the first embodiment , the fourth module 84 executes the operation of step S104 of the first embodiment, and the fifth module 85 executes the operation of step S105 of the first embodiment. It will not be expanded in detail here.

[0108] Those skilled in the art should understand that each module or each step of the present invention described above can be realized by a general-purpose computing device, and they can be concentrated on a single computi...

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Abstract

The invention discloses a pre-stack seismic inversion method and a system thereof. The pre-stack seismic inversion method includes the following steps that a longitudinal wave impedance reflection coefficient, a transverse wave impedance reflection coefficient and a density reflection coefficient corresponding to a longitudinal wave impedance initial model, a transverse wave impedance initial model and a density initial model respectively are obtained based on the longitudinal wave impedance initial model, the transverse wave impedance initial model and the density initial model; a simulation pre-stack angle gather is obtained by the adoption of the reflection coefficients according to the Fatti approximate equation and the convolution principle forward modeling; an error function is established based on the simulation pre-stack angle gather and an actual pre-stack angle gather; a pre-stack inversion target model is established according to the actual pre-stack angle gather; the pre-stack inversion target model is processed through the error function, and the longitudinal wave impedance, the transverse wave impedance and the density are obtained through inversion. According to the pre-stack seismic inversion method and the system thereof, the rock stratum density can be obtained directly through inversion, and the advantages of being high in computation speed and good in stability are achieved.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a pre-stack seismic inversion method and a system thereof. Background technique [0002] In the field of petroleum exploration and development, there are two commonly used seismic lithology analysis methods: one is the seismic attribute and seismic amplitude analysis method based on post-stack seismic data, which is called post-stack seismic analysis or post-stack seismic inversion; The second is the seismic attribute and seismic amplitude analysis method based on pre-stack seismic data, which is called pre-stack seismic analysis or pre-stack seismic (Amplitude Versus Offset, AVO) inversion. Among them, pre-stack seismic analysis has been widely used in seismic lithology analysis because the data used include information on the velocity and density of compressional and shear waves in the subsurface medium, as well as rich amplitude and travel time information. ...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 白俊雨许自龙
Owner CHINA PETROLEUM & CHEM CORP
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