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Well-constrained pre-stack elastic parameter inversing method for modulating supplemented subspace

A technology of elastic parameters and well constraints, which is applied in the fields of seismology and seismic signal processing for well logging records, can solve the problems of not being too small in the frequency band, easy to generate distortion in splicing, strong high-frequency noise, etc., and shorten the calculation time , avoid over-reliance, improve the effect of resolution

Inactive Publication Date: 2011-08-31
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The Fusion Petroleum Technology Company of the United States claims to have developed a revolutionary broadband spectral inversion technology, which can eliminate wavelets and does not require well calibration, no prior model, and no horizon information. principle of confidentiality
In 2003, another high-frequency recovery technology, HiSpec technology, was tested, claiming to use the technology of low-frequency projection to high-frequency, the effect is that the event is thinner, the small event is increased, but the continuity is still good
Spectral whitening is zero-phase, it does not change the phase spectrum of seismic data, but there are the following problems: the splicing between adjacent frequency bands is prone to distortion; the frequency band should not be too small, otherwise it will cause more serious Gipps effect; Generate strong high-frequency noise
[0010] However, the existing technology has the following deficiencies: (1) The existing method takes a long time to calculate, and the general work area needs several hours to several days to complete a process, which requires parallel processing and high operating costs; (2) It is not suitable for repeated adjustments (3) The wave group details of the obtained frequency-uplifting data are not rich, and the events are simply thinned or broken, which cannot show the characteristics of alternating thickness and thickness of the seismic section, and the layers of the original section are lost. (4) Excessive reliance on layered models is not suitable for seismic data of reservoirs with network characteristics (fluvial facies reservoirs, formations with dense pores, fractures and caves in carbonate rocks, etc.)

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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0033] Key technology of the present invention is described as follows:

[0034] 1) Automatic gain high-frequency subspace compensation: Spectrum continuation is to fill the unknown spectrum with the known spectrum. This method can restore the high frequency. The frequency shift in the frequency domain is equivalent to the convolution operation in the frequency domain, that is, the space domain the multiplication operation. Modulation can introduce the mechanism of up-frequency, and at the same time, it is found that controlling the phase of the maximum and minimum feature points of the seismic curve can retain the characteristics of the original curve, thus discovering a high-frequency reconstruction method using automatic amplitude gain of seismic dat...

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Abstract

The invention relates to a well-constrained pre-stack elastic parameter inversing method for modulating supplemented subspace, belonging to the field of seismic log. The method provided by the invention has the advantages that: the computation time is shortened so that the running time is shortened and the cost is reduced; the processing parameters can be adjusted so that a better processing result can be obtained; the frequency-increasing data wave group detailed information is not abundant so that the wave group characteristics of original seismic events and the interlaminar information of original profiles are maintained and the resolution of the profiles is enhanced; the undue dependence on a stratified model is avoided to ensure that the information of combined reconstruction beside the well is preferably fitted with the log information, and the non-stratified information contained in seismic data can be fully reflected outside the well; therefore, the problem of matching the seismic data of reservoir stratums (stratums such as fluvial facies reservoir stratum, carbonatite pore and fissure and hole intensive belt and the like ) with reticular characteristics with the well information is solved.

Description

1. Technical field [0001] The invention relates to a well-constrained pre-stack elastic parameter inversion method for modulating and supplementing subspace, which belongs to the high-frequency reconstruction method of well-constrained seismic data and belongs to the field of seismic logging. 2. Background technology [0002] The logging data is closely combined with the well-passing seismic data, and the insufficient bandwidth of the seismic data is supplemented by the high-frequency information-rich logging data, thereby improving the resolution of the seismic data and avoiding excessive dependence on the layered model. The information fits better with the logging data near the well, and can fully reflect the non-layered information contained in the seismic data outside the well, and can describe the characteristics of the reservoir in detail. A set of wave elastic parameters of the logging-seismic data Joint inversion techniques and methods. [0003] In recent years, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/50
Inventor 刘洪
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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