Inversion method for stratum elasticity constant parameter of pre-stack seismic data

Abstract

The invention relates to an inversion method for a stratum elasticity constant parameter of pre-stack seismic data in geophysical prospecting for petroleum. The method comprises the following steps of: acquiring seismic data, and processing the pre-stack seismic data; obtaining logging data and extracting angle gather seismic data to form all stacked data; performing horizon calibration on the seismic data and the logging data; inverting the seismic data which is stacked at different incident angles to obtain a wave impedance parameter; calculating a corresponding reflection coefficient; generating a logging and seismic data pair; calculating a weight function and a model parameter of a function mapping network model, an impedance parameter and an elasticity constant; and drawing an elasticity constant profile for reservoir lithologic identification, petroleum-gas prediction, oil-water interface determination and petroleum reservoir description. By the method, the elasticity constant can be calculated by the conventional inversion of the seismic data and the logging data; and the method has certain adaptability to the inversion of faults and pinch-out zones, a wide application range, high resolution, high calculation speed, high stability, high calculation accuracy and the characteristic of certain anti-noise property.

Description

Technical field [0001] The invention relates to geophysical prospecting technology, and belongs to a method for inversion of pre-stack seismic data formation elastic constant parameters provided for reservoir prediction, oil-water interface identification and oil reservoir description during oilfield exploration, development and exploitation. Background technique [0002] The process of seismic exploration is to use artificial excitation of seismic waves at a series of points on the ground. The seismic waves propagate underground. When encountering the wave impedance (the product of the seismic wave propagating underground in the formation medium and the medium density) interface (ie When the wave impedance of the upper and lower strata are not equal), the seismic wave is reflected on the wave impedance interface, the direction of the seismic wave is changed, and the seismic wave starts to propagate upward. Receivers are placed on a series of receiving points on the ground to rece...

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Problems solved by technology

[0007] Although the vertical resolution of seismic data is very low, it cannot meet the requirements of reservoir prediction and reservoir description, but the seismic data has certain continuity and resolution in the horizontal direction.

Although the vertical resolution of well logging data is very high, which can meet the requirements of reservoir prediction and reservoir description, the horizontal resolution of well logging data does not have the ability

At present, the complementary characteristics of horizontal continuity of seismic data and vertical high resolution of well logging data cannot be effectively used, and the high resolution characteristics of well data can be extended to interwell seismic wave inversion data

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