Method and device for imaging optimized angle of well earthquake reflected wave

Abstract

The invention discloses a method for imaging an optimized angle of a well earthquake reflected wave, comprising the following steps: carrying out VSP-CDP conversion of each concentrical depth point according to well data of an objective area to obtain an imaging section set; obtaining an optimized angle upper limit value according to acoustic logging data or zero VSP speed data of the objective area; and stacking and imaging sections which are smaller than the optimized angle upper limit value in the imaging section set. The method can eliminate wave shape distortion, frequency reduction, polarity inversion and statistical noise interference of a small-angle area for wide-angle reflection and can increase a reflected wave imaging resolution ratio to really reflect the vertical and horizontal variation of underground media.

Description

technical field [0001] The invention belongs to the field of seismic data processing, and in particular relates to a preferred angle imaging method and device for interwell seismic reflection waves. Background technique [0002] At present, the cross-well seismic reflection wave imaging method is: stacking on the common center depth point gather or the common shot point gather, and each common center depth point gather can generate a vertical seismic section-common depth point (Vertical Seismic Profiling-Common Depth Point (VSP-CDP for short) imaging, multiple common center depth point gathers generate multiple VSP-CDP imaging profile sets, and then perform full-angle stacking imaging on all profiles in the profile set. Such as figure 1 As shown in , a schematic diagram of the effect of full-angle superimposed imaging of reflected waves in the Ken 71 area of ​​Shengli Oilfield is given. [0003] In the process of realizing the present invention, the inventor found that the...

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Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a cross-well seismic reflection wave optimal angle imaging method to solve the problem that the imaging resolution is reduced due to the wide-angle reflection of the reflection wave and cannot truly reflect the vertical and horizontal changes of the underground medium.

[0005] Another technical problem to be solved by the embodiments of the present invention is to provide a preferred angle imaging device for interwell seismic reflection waves to solve the problems of low imaging resolution and inability to truly reflect the vertical and horizontal changes of underground media in existing reflection wave imaging devices

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