Inversion method and system based on earthquake dominant frequency

A dominant frequency and inversion technology, applied in seismic signal processing, special data processing applications, instruments, etc., can solve problems such as ineffective identification and achieve effective identification effects

Inactive Publication Date: 2015-01-21
PETROCHINA CO LTD
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Problems solved by technology

[0003] However, the aforementioned methods and technologies are all effective explorations for the identification of homogeneous and layered reservoirs, and cannot effectively identify heterogeneous reservoirs such as carbonate rocks.

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  • Inversion method and system based on earthquake dominant frequency
  • Inversion method and system based on earthquake dominant frequency
  • Inversion method and system based on earthquake dominant frequency

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Embodiment Construction

[0014] The technical means adopted by the present invention to achieve the intended invention purpose are further described below in conjunction with the drawings and preferred embodiments of the present invention.

[0015] figure 1 It is a flowchart of an inversion method based on seismic dominant frequencies according to an embodiment of the present invention. figure 2 It is a schematic diagram of data relationship of an inversion method based on seismic dominant frequency according to an embodiment of the present invention. combine figure 1 and figure 2 As shown, the method includes:

[0016] Step 1. Obtain the original seismic pure wave data, well logging and geological data, and perform reservoir calibration and reservoir seismic response analysis to obtain the reservoir seismic response characteristics; among them, the original seismic pure wave data is post-stack seismic data, mainly Used for post-stack inversion.

[0017] In step 2, spectrum analysis is performe...

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Abstract

The invention discloses an inversion method and system based on earthquake dominant frequency. By means of the method and system, an intra-platform shoal reservoir can be effectively recognized. The method includes the first step of obtaining original earthquake pure wave data and well logging and geological data, carrying out reservoir calibration and earthquake response analysis on the data and obtaining reservoir earthquake response characteristics, the second step of carrying out spectral analysis according to the reservoir earthquake response characteristics to obtain reservoir spectral characteristics, the third step of obtaining earthquake single-frequency data cube according to the reservoir spectral characteristics by means of the frequency division method, the fourth step of carrying out reservoir tuning frequency analysis according to the earthquake single-frequency data cube and reservoir calibration to obtain a reservoir dominant frequency band, the fifth step of carrying out band-pass filtering on the original earthquake pure wave data according to the reservoir dominant frequency band to obtain earthquake pure wave data corresponding to the reservoir dominant frequency band, and the sixth step of carrying out wave impedance inversion on the earthquake pure wave data corresponding to the reservoir dominant frequency band to obtain wave impedance data, and recognizing the reservoir by means of the wave impedance data.

Description

technical field [0001] The invention relates to the field of prediction of heterogeneous reservoirs such as carbonate rocks in petroleum geological exploration, in particular to an inversion method and system based on seismic dominant frequency. Background technique [0002] In the existing technology, conventional wave impedance inversion generally uses the original full-band seismic pure wave data for conventional post-stack inversion, and the idea of ​​frequency-divided wave impedance inversion divides seismic data into several frequency band data with a certain bandwidth for inversion , to achieve the goal of avoiding the influence of high-frequency noise when inverting with low-frequency components or avoiding the influence of low-frequency noise when inverting with high-frequency components. In addition, in the prior art, a high-resolution inversion technology based on tuning frequency and frequency division processing is also disclosed. The relationship between wave-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G06F19/00
Inventor 王振卿王宏斌
Owner PETROCHINA CO LTD
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