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Large inclined shaft geophone moving VSP free surface multiple wave imaging method and device

A technology of multiple wave imaging and scanning, which can be used in measurement devices, instruments, scientific instruments, etc., and can solve problems such as immaturity

Active Publication Date: 2020-10-16
OPTICAL SCI & TECH (CHENGDU) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Jianguo and others studied "Walkaway VSP Free Surface Multiple Wave Prestack Depth Migration Imaging", the literature uses one-way wave continuation to realize free surface multiple wave imaging of VSP with variable offset distance; The research on surface multiple wave imaging is still immature, and there are still many inconveniences in the fields of address research and drilling guidance

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  • Large inclined shaft geophone moving VSP free surface multiple wave imaging method and device
  • Large inclined shaft geophone moving VSP free surface multiple wave imaging method and device
  • Large inclined shaft geophone moving VSP free surface multiple wave imaging method and device

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Embodiment Construction

[0108] The technical scheme of the present invention is described in further detail below in conjunction with accompanying drawing, but protection scope of the present invention is not limited to the following description.

[0109] Such as figure 1 As shown, a mobile VSP free surface multiple wave imaging method for offset shaft inspection, including the following steps:

[0110] S1. Input the large inclined shaft offset mobile VSP full wave field common receiver point gather, 2D geological model, and migration parameters:

[0111]S101. Input the large inclined shaft shot detection mobile VSP full wave field common receiver point gather {VSPData}, read shot point coordinates {SX, SY}, shot point depth SZ, wave point coordinates {RX, RY}, wave point depth RZ, wellhead geodetic coordinates {WMX, WMY};

[0112] S102. Input longitudinal wave 2-dimensional grid layer velocity geological model {V}, model abscissa MX, model abscissa and ordinate MZ, wellhead model coordinates MWMX ...

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Abstract

The invention discloses a large inclined shaft geophone moving VSP free surface multiple wave imaging method and device. The method comprises the following steps: S1, inputting a large inclined shaftgeophone moving VSP full wave field common geophone gather, a two-dimensional geologic model and migration parameters; S2, according to the input data, establishing coordinates of a shot point and a detection point in the two-dimensional geologic model; S3, performing fast Fourier transform on the input common detection point gather to a frequency wavenumber domain, and setting a frequency domainseismic source; S4, enabling free surface multiples of a single detection point to be subjected to pre-stack depth migration imaging; S5, completing geophone moving VSP free surface multiple wave pre-stack depth migration imaging of all geophone points; and S6, performing common imaging gather superposition to acquire multiple wave pre-stack depth migration superposition imaging of the free surface of the shot-geophone mobile VSP. Rich information carried by multiple waves of the free surface is effectively utilized, pre-stack depth migration imaging of the multiple waves of the free surface of the geophone movable VSP is achieved, and an accurate data basis is provided for geological research and drilling guidance.

Description

technical field [0001] The invention relates to seismic data migration imaging in geophysical prospecting, in particular to a method and device for imaging mobile VSP free surface multiple waves in a large inclined shaft. Background technique [0002] The shot detection mobile VSP is an observation system designed for highly inclined wells, that is, the shot line is laid on the surface and located directly above the geophone in the well, and the shot line moves with the geophone. The advantage of mobile VSP is that the coverage times are more uniform. This observation system is mainly used for steering and targeting during the drilling of deviated wells. Usually, free surface multiples are attenuated as interfering waves. Compared with reflection, free surface multiples have the characteristics of easy identification, wide illumination, small reflection angle and long propagation path. [0003] Wu Shiping and others studied "Walkaway VSP Multiple Wave Imaging Technology R...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/512
Inventor 李建国
Owner OPTICAL SCI & TECH (CHENGDU) LTD