Method for improving seismic data time-depth conversion precision

Abstract

The invention discloses a method for improving the time-depth conversion precision of seismic data, and the method comprises the following steps: 1), obtaining the speed of the seismic data of each channel and each sampling point through employing a self-adaptive high-density bispectrum speed scanning technology; 2) obtaining average speed data conforming to stratum continuity and space consistency under the control of a target horizon; 3) performing trend correction on the seismic average velocity body by using the interval velocity coefficient fitted by the logging information data; 4) correcting the random residual error by using the speed data of the logging data of the multiple wells and the seismic data speed average error factor; the method has the advantages that on the basis of high-precision and high-density speed modeling, an average speed trend correction technology and a residual factor correction technology are provided, and the problem that conventional time-depth conversion precision is insufficient is solved.

Description

technical field [0001] The invention relates to the field of digital signal processing of seismic data, in particular to a method for improving the precision of time-depth conversion of seismic data. Background technique [0002] At each stage of oil and gas field exploration and development, it is necessary to accurately obtain the depth data information of each underground oil and gas layer to provide data support for drilling construction. The seismic data collected by seismic exploration are all time-domain information, how to improve the precision of seismic data conversion from time domain to depth domain will directly affect the efficiency of oil and gas reservoir exploration and development. [0003] For a long time, many experts and scholars have conducted in-depth research on time-depth conversion technology and proposed various improvement methods. In 1936, Slotnick proposed a seismic traveltime calculation method under the assumption that the formation velocity ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for improving the accuracy of time-depth conversion of seismic data in view of the insufficient precision of time-depth conversion of seismic data in the prior art. Velocity trend correction technology and residual factor correction technology solve the problem of insufficient accuracy of conventional time-depth conversion, and are more suitable for time-depth conversion in the development stage of oil and gas reservoir evaluation

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