Method for matching longitudinal waves with transverse waves for geophysical exploration

Abstract

The embodiment of the invention provides a method and device for matching longitudinal waves with transverse waves for geophysical exploration. The method includes the steps that full wave train well logging data are utilized to determine phase and wave group characteristics of the longitudinal waves and converted transverse waves in a main interface; well control processing is respectively conducted on the longitudinal waves and the converted transverse waves; the polarity of the longitudinal waves and the polarity of the converted transverse waves are compared and phase correction is conducted; a data body including the speed ratio of the longitudinal waves to the transverse waves is acquired according to prestack data of the longitudinal waves; the data body is utilized to convert the converted transverse waves from the time domain of the converted transverse waves to the time domain of the longitudinal waves; identification layers which can stably track in whole research area are picked up and utilized to conduct fine horizon correction on the converted time domain of the converted transverse waves. The method and device are combined with seismic data processing, forward modeling, inversion and other measures, so that the method and device are reliable in theory and rigorous in process, and the longitudinal waves and the transverse waves can be well matched.

Description

technical field [0001] Embodiments of the present invention relate to a method for matching longitudinal and shear waves, that is, a method for correcting and aligning longitudinal and converted shear waves to the same time domain, and more specifically, a method and device for matching longitudinal and shear waves for geophysical exploration. Background technique [0002] With the gradual deepening of petroleum exploration, the requirements for seismic exploration technology are getting higher and higher, and it has shifted from simple structural exploration to lithology exploration, and from lithology prediction to fluid prediction. Compared with traditional P-wave technology, multi-wave seismic technology has obvious advantages in lithology and fluid prediction. At the same time, with the development of software and hardware technology in recent years, the application of multi-wave is gradually increasing. [0003] Because the propagation modes and paths of longitudinal ...

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Problems solved by technology

[0005] The inventors found that the above three methods all have defects: the first method starts from the well data, and can better solve the matching problem near the well point, but it cannot solve the problem in areas with no well constraints and large lateral changes; the second method Relying on the accuracy of seismic horizons, it is often necessary to have high-precision horizon control in shallow, middle and deep layers, and in different lithologic layers, otherwise it will be difficult to accurately match; the third method requires high signal-to-noise ratio and correlation for both P- and S-wave profiles

However, this method is a method proposed at the early stage of the application of traditional multi-wave technology. This method can partially solve the matching problem of large layers, but it has obvious limitations, especially in complex structural areas and small layers that cannot be continuously tracked. It is difficult to match well.

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