Seismic relative wave impedance predicting method and apparatus based on frequency domain multi-level differentiations

A technology of frequency domain and wave impedance, applied in the field of geophysical exploration, can solve the problems of ineffective identification of thin interbeds and limited effect of high-frequency boosting

Active Publication Date: 2015-11-25
PETROCHINA CO LTD
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However, the above methods are basically limited to single-order or few-order differentials in the time domain, and the high-frequency b

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  • Seismic relative wave impedance predicting method and apparatus based on frequency domain multi-level differentiations
  • Seismic relative wave impedance predicting method and apparatus based on frequency domain multi-level differentiations
  • Seismic relative wave impedance predicting method and apparatus based on frequency domain multi-level differentiations

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[0073] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0074] The specific implementation of the embodiment of the present application will be described in detail below with several specific examples.

[0075] The following firstly introduces an embodiment of a seismic relative wave impedance prediction method based on frequency domain multi-order differential in the present application. com...

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Abstract

The invention discloses a seismic relative wave impedance predicting method and a seismic relative wave impedance predicting apparatus based on frequency domain multi-level differentiations. The method comprises following steps: building a thin interlayer model and obtaining a combined earthquake record based on the thin interlayer model; raising the frequency of the combined earthquake record by different levels of differentiations within a frequency domain and establishing the relationship between the differentiation level of an amplitude spectrum and the main frequency; adding together the differentiation levels of amplitude spectrums to obtain a laminated amplitude spectrum for the combined earthquake record; using a sonic wave measuring method to determine the multi-level differentiation amplitude spectrum from sonic wave impedance spectrum to obtain a corrected laminated amplitude spectrum; combining the three-level differentiation phase spectrum in the combined earthquake record to obtain a wide band frequency spectrum; finally, effectively recognizing the thin interlayer based on the seismic relative wave impedance with high resolution obtained by the wide band frequency spectrum. The technical solutions provided in the invention can effectively increase the resolution of seismic relative wave impedance.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a seismic relative wave impedance prediction method and device based on multi-order differential in the frequency domain. Background technique [0002] The layer thickness in the thin interbed is much smaller than the quarter wavelength of the seismic wavelet, which causes the reflection information of different layers to interfere with each other in the seismic record, which seriously interferes with the imaging and identification of the thin interbed. Therefore, the thin interbed Identification has always been a difficult problem in seismic exploration. [0003] Existing technologies such as deconvolution of seismic records need to use operators with a certain time window length to act on seismic records to improve the resolution of seismic records. (tens to hundreds of milliseconds, equivalent to tens to hundreds of meters thick), the mixed processing of strat...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 雍学善郭欣高建虎李胜军
Owner PETROCHINA CO LTD
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