Method for determining optimum velocity profile of converted-wave pre-stack time migration during seismic data processing process

Abstract

The invention provides a method for determining optimum velocity profile of converted-wave pre-stack time migration during seismic data processing process. The method comprises the following steps: taking converted wave velocity changing with the seismic wave reflex time as the center velocity and velocity interval changing with the seismic wave reflex time as step length, forming a group of converted wave velocity functions changing with the seismic wave reflex time based on the velocity interval; obtaining a longitudinal wave velocity function and a transversal wave velocity function by utilizing a longitudinal wave/transversal wave velocity ratio; converting the seismic data into velocity spectrum form through the converted-wave pre-stack time migration by utilizing the velocity functions respectively; determining the optimum velocity used by the converted-wave pre-stack time migration according to energy punch strength and distribution positions on the velocity spectrum, and then generating the optimum velocity profile of converted-wave pre-stack time migration. The method can perform calculation in effective velocity range, greatly reduces the calculation amount for only requiring calculating the information output on the velocity analysis points, and therefore has improved practicability.

Description

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AI Technical Summary

Benefits of technology

This technology helps reduce calculations by calculating just what data needed for quick response time (QT) measurement). It does this without actually measuring it or performing complex computations on all relevant variables before sending them out over again.

Problems solved by technology

Technological Problem addressed during the past decade involves improving the efficiency and precision of predicting the movement of buried sedimentary rocks through conversion wave methods such as converting them backward along their own path called Shearing Time Propagation Interval Analysis(SPA). However, previous attempts were limited because they had limitations in calculating the best acceleration profiles overcomes these issues.

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