Method for shot deviation in seismic prospecting and method for positioning correct shot position

Abstract

The invention provides a method for shot deviation in seismic prospecting and method for the positioning correct shot position. The method for shot deviation includes picking up the first-arrival time of the single-shot data; constructing the corresponding offset distance-first arrival time relation for each shot point in the serial shot point including the shot point and the receiver point position relation data; finding out the optimal target offset distance-first arrival time relation for the condition that the first-arrival time is gradually increased along the increasing of the offset distance; comparing the shot point corresponding to the target offset distance-first arrival time relation with the shot pint recorded in the trace header of the single-shot data, if the coordinate positions of the shot points are not consistent, determining that the shot detection relation of the shot is incorrect (namely, deviated), and meanwhile, taking the shot point corresponding to the target offset distance-first arrival time relation as a correct shooting position. According to the invention, the shot deviation of the single-shot record can be rapidly and accurately detected; and meanwhile, the correct shooting position can be pointed out, and the need of field single-shot onsite quality control can be met.

Description

technical field [0001] The invention relates to the technical field of data acquisition for oil and gas seismic exploration, specifically, the invention relates to a method for detecting shot deviation in seismic exploration and a method for locating the correct shot position in seismic exploration. Background technique [0002] Usually, shot detection relationship error, also known as shot deviation, refers to the phenomenon that shot point excitation position is wrong in petroleum seismic exploration, which will cause confusion of reception relationship, and seriously affect the quality of single shot and subsequent processing work. [0003] For this reason, it is particularly important to find the shot deviation and locate the correct point position in real time at the first scene of acquisition. However, traditional shot offset detection methods are time-consuming and difficult to guarantee accuracy. Contents of the invention [0004] The purpose of the present invent...

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Problems solved by technology

However, the traditional shot offset detection method takes a long time and the accuracy is difficult to guarantee

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