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Method and device of ensuring scalar transverse wave in three-dimensional earthquake elastic excursion detection wave field

An elastic migration, three-dimensional seismic technology, applied in the field of exploration geophysics, can solve problems such as the inability to extract three-dimensional seismic scalar shear waves

Active Publication Date: 2013-06-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the embodiment of the present invention is to provide a method and device for determining the scalar shear wave in the three-dimensional seismic elastic migration detection wave field, so as to solve the problem that the existing Helmholtz wave field separation technology cannot extract the three-dimensional seismic scalar shear wave

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  • Method and device of ensuring scalar transverse wave in three-dimensional earthquake elastic excursion detection wave field
  • Method and device of ensuring scalar transverse wave in three-dimensional earthquake elastic excursion detection wave field
  • Method and device of ensuring scalar transverse wave in three-dimensional earthquake elastic excursion detection wave field

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Embodiment 1

[0067] This embodiment combines a simple three-dimensional model elastic reverse time migration (a pre-stack elastic depth migration method) to illustrate the determination method of the scalar shear wave in the three-dimensional seismic elastic migration receiver field provided by the present invention, and to obtain The application of the scalar shear wave is described. The three-dimensional inclined interface medium model (the coordinate system used by the medium model is a three-dimensional Cartesian coordinate system, and its coordinate axes are the x-axis, y-axis, and z-axis that have a common zero point and are orthogonal to each other. ) P-wave velocity such as figure 2 As shown, the model contains an inclined reflection interface and a horizontal reflection interface. The shear wave velocities of the three layers from top to bottom are 3000m / s, 3300m / s and 3700m / s respectively, and the shear wave velocity is 0.588 times of the corresponding longitudinal wave velocity....

Embodiment 2

[0084]In this embodiment, the method for determining the scalar shear wave in the three-dimensional seismic elastic migration detection wave field provided by the present invention is applied to the converted wave imaging experiment of a complex model, to verify the adaptability of the method to the complex model, the longitudinal wave velocity of the model is Such as Figure 8 shown ( Figure 8 Among them, the velocity unit is m / s, the shear wave velocity is 0.588 times of the corresponding longitudinal wave velocity, and the density is constant 1000kg / m 3 ), taken from the SEG / EAGE3D salt dome model (see literature: Aminzadeh Fet.al., SEG / EAGE3-Dmodelingproject:2ndupdate.TheLeadingEdge, 1994,13(9):949~952).

[0085] The imaging method adopts the same elastic reverse time migration as in the first embodiment, and the determination method of the scalar shear wave in the three-dimensional seismic elastic migration detection wave field provided by the first embodiment is applie...

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Abstract

The invention provides a method and a device of ensuring scalar transverse wave in a three-dimensional earthquake elastic excursion detection wave field. The method comprises a step of a curl calculation of the detection wave field to gain vector transverse wave; a step of calculating a direction of propagation of a hypocenter wave field and the direction of the propagation of the detection wave field; a step of calculating the direction of the propagation of the hypocenter wave field and a vector product of the direction of the propagation of the detection wave field; a step of ensuring a sign of the scalar transverse wave according to the direction of the propagation of the vector transverse wave and the hypocenter wave field and the vector product of the direction of propagation of the detection wave field; a step of gaining the scalar transverse wave according to an absolute value of the vector transverse wave and the sign of the scalar transverse wave. The device can be used for ensuring the scalar transverse wave in the three-dimensional detection wave field and can be applied to imaging of reflecting and converting the transverse wave in the three-dimensional earthquake elastic excursion. A physical significance of imaging result of the transverse wave gained by reflecting and converting through the scalar transverse wave is definite so as to be beneficial for an upper seismic interpretation application in a later period.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to a method and device for determining a scalar shear wave in a three-dimensional seismic elastic migration wave field. Background technique [0002] In the current elastic reverse time migration imaging of 3D seismic data, the commonly used Helmholtz wave field separation technology is to perform divergence calculation on the elastic wave field (including source wave field and receiver wave field) to obtain the longitudinal wave, and perform curl operation to obtain the shear wave. The longitudinal wave obtained by this method is in scalar form, while the obtained shear wave is in vector form. However, the application of this vector form shear wave (hereinafter referred to as vector shear wave) is different in two-dimensional and three-dimensional cases. In the application of the two-dimensional case, the vector shear wave has only one non-zero component, which is actually an ...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 杜启振公绪飞
Owner BC P INC CHINA NAT PETROLEUM CORP
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