A Method of Calculating Relative Wave Impedance by Accurate Trace Integral

Abstract

The invention relates to a seismic data reservoir inversion technique in seismic exploration reservoir prediction, in particular, a method for calculating relative wave impedance in a high-precision manner by using trace integration. The method comprises the following steps that: a Robinson multi-level operator is constructed; a stratigraphic reflection coefficient is calculated; and stratigraphic reflection coefficient integration is calculated. With the method of the invention adopted, high-precision relative wave impedance data can be obtained quickly only with conventional seismic data required, and therefore, the relative change condition of wave impedance can be evaluated quickly, wherein the wave impedance can reflect the lithologic information of underground media; with the high-precision relative wave impedance calculation method adopted, the application of the relative wave impedance inversion technique in practical seismic exploration is forcedly promoted. The method is of great reference value for the spatial distribution rules of lithologic parameters in seismic reservoir interpretation and is of great help for the guidance for oil and gas exploration and development and the improvement of the success rate of oil and gas exploration.

Description

technical field [0001] The invention relates to a seismic data reservoir inversion technology in reservoir prediction of seismic exploration, in particular to a method for calculating relative wave impedance with high-precision trace integration. Background technique [0002] With the gradual deepening of seismic exploration, seismic exploration has gradually changed from structural oil and gas reservoirs to complex lithologic oil and gas reservoirs and subtle oil and gas reservoirs. Seismic reservoir prediction is becoming more and more difficult, and the requirements for seismic data reservoir inversion are also increasing. higher. Dow integration inversion is based on the assumption that the underground formation wave impedance is a continuous and differentiable function of the depth variable, the formation reflection coefficient is obtained by the seismic trace autocorrelation method, and then the formation wave impedance is calculated by depth integration of the reflect...

AI Technical Summary

Problems solved by technology

The seismic trace records are directly converted into wave impedance data by the integration method. The inversion process has the advantages of small integral error, simple calculation, and low computer requirements. However, the trace integration inversion process only depends on seismic data, and the quality of seismic data and Bandwidth has a great influence on the inversion results

Because seismic data lack low-frequency and high-frequency information due to acquisition and processing, and the frequency band is narrow, the longitudinal resolution and accuracy of the wave impedance obtained by this method are low.

Dow integration inversion method cannot use data constraints such as well logging, so the inversion result is a relative value, and the vertical resolution is not high, which is suitable for the early stage of seismic exploration and the research area without well data

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