Method for improving imaging quality of vertical seismic profile

A vertical seismic profile and imaging quality technology, applied in seismic signal processing, seismology for logging records, etc., can solve the problem that the dip angle of the reflection layer has a great influence on the accuracy, achieve the effect of reducing the impact and improving the imaging quality

Active Publication Date: 2010-01-20
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

The accuracy of this method in estimating the inclination angle of the reflector is greatly affected by the polarization measurement error
However, due to the influence of wave field interference, it is not easy to accurately determine the polarization direction of the wave field

Method used

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  • Method for improving imaging quality of vertical seismic profile
  • Method for improving imaging quality of vertical seismic profile
  • Method for improving imaging quality of vertical seismic profile

Examples

Experimental program
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Embodiment Construction

[0039] Further illustrate the present invention below in conjunction with accompanying drawing.

[0040] Artificially stimulate seismic waves on the surface, place seismic wave receiver strings in the well to receive seismic wave field signals, and then transmit them to ground recording instruments by cables to record VSP seismic wave field. The excitation position includes zero bias and non-zero bias.

[0041] The data used in the embodiments of the present invention come from a two-dimensional structural model. figure 1 The construction model is given, figure 2 Based on the theoretical three-component VSP upgoing wavefield data generated by this model, the distance from the shot point to the wellhead is 1000 meters.

[0042] The first arrivals of downgoing P-waves were picked up from the recorded zero-bias and non-zero-bias data respectively. Then, the layers are divided by the acoustic logging data, and the velocity of each layer is inverted by the first arrival time of...

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Abstract

The invention relates to a method for improving the imaging quality of a vertical seismic profile in oil geophysical prospecting. The method comprises the following steps: picking up downlink longitudinal wave first-arrival time of different receiving points in zero-offset and nonzero-offset vertical seismic profile wave field data; establishing an aclinic initial interval speed model; pushing the first-arrival time of longitudinal wave outwards to a well side point to obtain a time field of downlink wave; seeking ray angles of downlink and uplink waves; forming a theoretical uplink wave field by utilizing the radial angle of the downlink wave and adopting a ray tracking method; obtaining a series of corresponding different interface dip angle values; and determining the maximal corresponding interface dip angle as the well side reflecting interface dip angle needing to be sought. The method can effectively reduce the influence of the estimated result of an overlying stratum on the reflecting interface dip angle and the influence of the estimated result of pickup error on the reflecting interface dip angle in the traveling of primary reflecting wave and improve the imaging quality by utilizing the vertical seismic profile.

Description

technical field [0001] The invention relates to petroleum geophysical exploration technology, is a vertical seismic profile (VSP) data processing method, specifically a method for improving the imaging quality of the vertical seismic profile. Background technique [0002] Conventional VSP data processing usually includes first arrival picking, velocity inversion, wavefield separation, imaging, etc. Imaging processing of VSP data is generally based on a horizontal velocity model. However, VSP imaging based on a horizontal layered velocity model can lead to inaccurate homing in the presence of a dip in the reflective interface. Common considerations for this problem are addressed by dip transit correction or iterative imaging. The dip transit time correction method for VSP data is based on the assumption that the subterranean medium is a single uniform dip layer, and the dip angle of the reflection interface needs to be independently estimated from the dip log or VSP data fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/40
Inventor 王宝彬侯爱源
Owner BC P INC CHINA NAT PETROLEUM CORP
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