Method for realizing pre-stack three-dimensional reverse time migration by utilizing checkpoint technology based on FPGA

Abstract

The invention relates to the technical field of oil and gas seismic exploration, in particular to a method for realizing pre-stack three-dimensional reverse time migration by utilizing a checkpoint technology based on an FPGA. The method comprises the steps of setting checkpoint parameters on a CPU platform through software design according to 3D-RTM calculation tasks with different scales and the resource quantity of a selected FPGA chip; and enabling the wave field data calculation time and the required data transmission time to be dynamic so as to achieve the effect of eliminating the I / O bottleneck. The resource utilization rate of the FPGA is improved, the calculation time of the whole calculation task is greatly shortened, and then the acceleration efficiency of the whole heterogeneous calculation is improved. According to the invention, the optimal FPGA and CPU data interaction scheme is set according to the characteristics of data volumes with different scales, so that the whole computing resource utilization rate is optimal. Meanwhile, dynamic adjustment parameters are realized at a CPU platform end through a software architecture, so that the expansibility of the method is greatly enhanced, the utilization rate of computing resources of any FPGA selected for 3D-RTM computing tasks with different scales is improved, and higher compatibility is achieved.

Description

technical field [0001] The present invention relates to the technical field of oil and gas exploration, in particular to an FPGA-based [0002] The checkpoint technology implements the pre-stack 3D reverse time migration method. Background technique [0003] In the oil and gas exploration industry, the potential for conventional oil and gas exploration is still huge, and unconventional oil and gas will be the main force for increasing reserves and production. However, the targets faced by exploration and development will be more complex, and it will be more difficult to increase reserves on a large scale and continue to increase production. Oil and gas targets are becoming more and more complex. The remaining resources of conventional oil and gas are distributed in complex nappe structures, pre-salt and inter-salt structures, complex geological bodies, and complex lithology. The proportion of unconventional oil and gas is gradually increasing. Harsh surface conditions, comp...

AI Technical Summary

Problems solved by technology

In a recent study, it was found that when computing 3D-RTM on heterogeneous platforms through FPGA, different FPGA models have different chip memory resources, and the data interaction time cannot be fully submerged in the calculation process when computing data volumes of different scales. The utilization of FPGA resources has not reached the maximum utilization, and the calculation acceleration ratio of the calculation is slightly different from the theoretical calculation.

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