Wavelet domain pre-stack seismic trace set absorption attenuation parameter estimation algorithm

A pre-stack seismic, absorption and attenuation technology, applied in the field of petroleum geophysical exploration, can solve the problems of fuzzy amplitude and travel time information, difficult to accurately locate the production layer, etc., and achieve the effect of improving the accuracy and improving the prediction accuracy.

Active Publication Date: 2014-08-13
长治浪潮云海云计算科技有限公司
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Problems solved by technology

The stacking blurs the amplitude and travel time information, covers some lithology and fluid features in the gather, and some subtle stratigraphic features cannot be detected on the post-stack data, especially when the thickness of the reservoir itself is much smaller than that of the seismic When the resolving power is low, the data extracted from the post-stack seismic data is difficult to accurately locate the production layer

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  • Wavelet domain pre-stack seismic trace set absorption attenuation parameter estimation algorithm
  • Wavelet domain pre-stack seismic trace set absorption attenuation parameter estimation algorithm
  • Wavelet domain pre-stack seismic trace set absorption attenuation parameter estimation algorithm

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Embodiment Construction

[0034] This embodiment is the application of the present invention in the interpretation of pre-stack data in an oilfield, and the specific steps are as follows:

[0035] figure 1 It is the pre-stack seismic data from an oilfield. The ordinate represents time, and the abscissa represents the CMP number. There are 1088 records and 111 CMP gathers. In order to display the pre-stack data more clearly, the figure 1 The part marked by the rectangular frame in the zoom-in process, such as figure 2 shown.

[0036] First take a seismic signal and determine two single-frequency frequencies, such as image 3 As shown, figure (a) is the signal waveform of the 202nd pre-stack seismic record, and figure (b) is its normalized Fourier transform amplitude spectrum. In actual data, the resolution of the amplitude spectrum of a single channel signal is low, and it is difficult to determine the frequency of a single frequency. In order to solve this problem, the average amplitude spectru...

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Abstract

The invention provides a wavelet domain pre-stack seismic trace set absorption attenuation parameter estimation algorithm by using difference of stratum on attenuation degree of seismic waves at different frequencies. The algorithm specially includes the steps that a high-frequency attenuation curve and a low-frequency attenuation curve of each common midpoint trace set are extracted at a certain moment in a wavelet domain, and the area defined by the two single-frequency attenuation curves is used for showing the absorption degree of seismic waves through the stratum of a CMP at the moment. Calculation is conducted on a whole window by time, and complete absorption characteristic parameter data bodies of a whole analysis area are obtained. On an absorption characteristics section, abnormal hydrocarbon is predicted through high-absorption characteristics. According to numerical example results of actual data, the effectiveness of the method is verified. Compared with a post-stack absorption attenuation method, according to the wavelet domain pre-stack seismic trace set absorption attenuation parameter estimation algorithm, influences on signals of a stacking treatment step are avoided, and the stratum attenuation parameter estimation accuracy of seismic data is improved.

Description

[0001] technical field [0002] The invention relates to the technical field of petroleum geophysical exploration, belongs to the category of seismic data interpretation, and is an estimation algorithm for absorption and attenuation parameters of pre-stack seismic gathers in the time-frequency domain, specifically an estimation algorithm for absorption and attenuation parameters of pre-stack seismic gathers in the wavelet domain . Background technique [0003] Seismic data interpretation is an important part of seismic data processing. It converts seismic data into our understanding of the underground geological conditions in the exploration area, and finds information related to oil and gas. In the process of reservoir oil and gas prediction, the absorption characteristics of the formation is a very important parameter, it has a high sensitivity to lithological changes, especially when the formation contains oil and gas, it will show a large abnormal mutation feature. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/40
Inventor 高亚力
Owner 长治浪潮云海云计算科技有限公司
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