Pre-drilling depth prediction method and system based on vertical seismic multi-wave data

Abstract

The present invention provides a pre-drilling depth prediction method and system based on vertical seismic multi-wave data. The method includes: collecting vertical seismic multi-wave data; processing the vertical seismic multi-wave data to obtain the processed vertical seismic data. Multi-wave data; Obtain the surface seismic section of the well; Identify the position of the target layer and the characteristics of the wave group from the surface seismic section of the well; According to the position of the target layer and the characteristics of the wave group, the processed vertical The direct wave, converted wave and reflected wave event corresponding to the target layer are identified in the seismic multi-wave data; the time-depth function is established according to the direct wave, converted wave and reflected wave event; according to the time- The depth function determines the prediction depth as well as the prediction time. It solves the problem of insufficient accuracy of existing prediction methods, and provides timely and accurate pre-drilling depth data of target formations for drilling engineering.

Description

technical field [0001] The present invention relates to the technical field of geophysical exploration, in particular to the application and processing technology of multi-wave in vertical seismic data, specifically a pre-drilling depth prediction method and system based on vertical seismic multi-wave data. Background technique [0002] Pre-drilling depth prediction using vertical seismic data is a traditional geophysical exploration technology, which almost appeared with the birth of vertical seismic data observation method. Up to now, pre-drilling depth prediction using vertical seismic data is still an important geophysical means to obtain information about the target layer ahead of the drill bit. [0003] In recent years, vertical seismic data technology has developed rapidly, but its pre-drill depth prediction method has hardly any progress. In the existing technology, only the method mentioned by Zhu Guangming in the book "Vertical Seismic Method" in 1986 is represent...

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Problems solved by technology

[0005] (1) The operation of this method itself needs to rely on visual observation to determine the direction of straight line extension, which has great uncertainty and will cause operational errors;

[0006] (2) This method only performs curve tracing on the upward and downward longitudinal waves of the target layer, and can only obtain one intersection point, especially in areas with a large formation dip angle, the angle between the downward longitudinal wave and the upward longitudinal wave in the vertical seismic data section is very small, the depth of the junction is more difficult to determine, and the prediction accuracy is greatly restricted

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