Geodetic method and system for vertical seismic profile based on real-time dynamic difference technology

Abstract

The invention discloses a vertical seismic section geodesic method and system based on real-time kinematic technology. The method comprises the steps of: determining the effective range of a referencestation according to the geometrical characteristics of the center point positions of biased and non-biased VSP excited cannon groups; determining the position of the reference station according to aplurality of control points using a static joint-measuring and locating method in the effective range of the reference station; erecting a reference station receiver and receiving excitation data ofa shot point according to the position of the reference station; and obtaining the coordinates of the shot point according to the excitation data and the theoretical data of the shot point. Accordingto the vertical seismic section geodesic method and system based on the real-time kinematic technology, the RTK measurement technology is adopted to locate the coordinates of the biased and non-biasedcannon groups in the implemented project; by processing the difference of the carrier wave phase observation result of two measuring stations in real time, the coordinates of the biased and non-biased VSP excited cannon groups are obtained accurately in real time.

Description

technical field [0001] The present invention relates to the field of earthquake in geophysical exploration wells, and more specifically, to a method and system for measuring vertical seismic sections based on real-time dynamic difference technology. Background technique [0002] The VSP vertical seismic profile method is to arrange multi-level and multi-component geophones along different depths of the borehole, excite seismic waves at points near the surface, and geophones perform seismic wave observation in the well. VSP observation methods currently mainly include zero well-source spacing (zero offset), non-zero well-source spacing (biased), WALKAWAY, 3D-VSP, etc. Compared with the seismic section observed on the ground, the VSP ground excitation points are more concentrated and clustered, that is, the shot group excitation. Schematic diagram of VSP zero-biased and biased (non-zero-biased) observation system, such as figure 1 shown. [0003] In the past, the coordinate...

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Problems solved by technology

Static, fast static speed is slow; post-processing dynamic measurement, errors cannot be found immediately, and even need to go to the site to rework; the measurement process of the total station is: input the stakeout data file and coordinate data file, and then set the measurement site and post-setting Viewpoint, confirm the azimuth, input the required stakeout coordinates to start stakeout, the steps are complicated and the efficiency is low, and the coordinate values ​​in the memory must be called through the point number during the stakeout process, or the coordinate values ​​are directly input on site, which is prone to misoperation and so on

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