Method for inverting Poisson ratio parameters of pre-stack seismic data

Abstract

The invention relates to a method for inverting a Poisson ratio parameter of pre-stack seismic data in oilfield development reservoir prediction and oil-water interface recognition. The method comprises the following steps: firstly, carrying out the superposition of different shot-geophone distances on the pre-stack seismic data according to the size of the shot-geophone distance to form a plurality of superposed seismic data of the different shot-geophone distances; comparing the superposed seismic data of the shot-geophone distances to obtain the superposed seismic data of the near shot-geophone distance and the superposed seismic data of the far shot-geophone distance reflecting the change of an underground reservoir; secondly, realizing the spatial distribution of inter-well stratum wave impedance parameters through utilization of inversion of a seismic and well logging data combined wave motion equation; calibrating the inter-well stratum wave impedance parameter as speed parameters; and finally, calculating the speed ratio and the Poisson ratio parameter; and the method effectively utilizes routine seismic data and the well logging data, has certain adaptive capacity for inversion of faultage and a pinch-out zone, has large application range, high resolution, small calculation quantity, high calculation speed, good stability and high calculation precision and has the characteristic of certain anti-noise capacity.

Description

technical field [0001] The invention relates to geophysical prospecting technology, and belongs to a method for inversion of Poisson's ratio parameters of pre-stack seismic data for reservoir prediction, oil-water contact identification and reservoir description in the process of oilfield exploration, development and production. Background technique [0002] The process of seismic exploration is to artificially excite seismic waves at a series of points on the ground, and the seismic waves propagate underground. When the wave impedance of the upper and lower strata is not equal), the seismic wave reflects on the wave impedance interface, the direction of seismic wave propagation changes, and the seismic wave begins to propagate upward. Receivers are placed on a series of receiving points on the ground to receive the upwardly propagating seismic wave Data, this is the positive process of seismic exploration (field exploration process). The seismic wave data received by the a...

AI Technical Summary

Problems solved by technology

[0009] There is little or no shear wave data in conventional seismic data and well logging data, so it is impossible to use conventional seismic data and well logging data to invert velocity ratio and Poisson's ratio parameters

The conventional AVO (Amplitude Variation with Offset, amplitude varies with offset) technology can invert the parameters of velocity ratio and Poisson's ratio through seismic data, but due to the low resolution of seismic data, the parameters of velocity ratio and Poisson's ratio can be inverted accordingly The resolution is also low, and it is difficult to meet the needs of high-resolution velocity ratio and Poisson's ratio parameters in the process of oilfield exploration, development and production.

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