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Mixed phase wavelet deconvolution method based on phase decomposition

A mixed-phase and deconvolution technology, applied in the field of exploration seismic, can solve problems such as the adaptability of seismic data affecting the estimation accuracy of mixed-phase wavelets

Active Publication Date: 2013-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method solves the YW equation many times, and each solution needs to introduce a white noise operator to enhance the stability of the operator, the cumulative error of the white noise operator seriously affects the estimation accuracy of the mixed phase wavelet and the accuracy of the actual seismic data. Adaptability

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  • Mixed phase wavelet deconvolution method based on phase decomposition
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  • Mixed phase wavelet deconvolution method based on phase decomposition

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Embodiment 1

[0060] Embodiment 1: In order to make the technical scheme and technical advantages of the present invention clearer, the following is combined with an embodiment of an oil field and accompanying drawings. The mixed-phase wavelet deconvolution method based on phase decomposition of the present invention will be further described in detail.

[0061] Step A: artificially stimulate seismic waves, use a geophone to detect reflected seismic signals from the ground, and record them on a magnetic tape. The specific field acquisition configuration of this embodiment is: 6 surveying lines receive at the same time, each surveying line is equipped with 180 detectors, the line spacing is 100 meters, the track spacing is 50 meters, the minimum distance between the excitation point and the detection point is 50 meters, record The length is 6000 milliseconds, the sampling interval is 2 milliseconds, and 667 shot seismic records were co-excited and received.

[0062] Step B, read the seismic...

Embodiment 2

[0087] This example is an application example in the X work area of ​​Tarim Oilfield. The surface of this area is covered by sand dunes. The collected seismic records experienced strong absorption by the surface sand dunes, resulting in serious high-frequency loss, and the seismic wavelet phase presents typical non-minimum phase characteristics. For this reason, the invention uses the mixed-phase wavelet deconvolution processing to improve the resolution of seismic data and enhance the ability of seismic signals to reflect underground structures.

[0088] Figure 8 It is a routinely processed seismic record section image with low resolution and cannot reflect the internal structure details between strong reflection interfaces. Figure 9 is the actual seismic wavelet extracted, and the seismic wavelet presents a typical mixed phase feature. Figure 10 is a mixed-phase wavelet deconvolution operator. The energy of the conventional deconvolution operator is concentrated on the p...

Embodiment 3

[0090] This example is an application example in the Y work area of ​​Tarim Oilfield. The oil and gas reservoirs in this area are fractured-vuggy carbonate reservoirs with large burial depth, strong heterogeneity, serious formation absorption, and the existing seismic resolution cannot meet the requirements. Geological needs for fine-grained interpretation of carbonate reservoirs.

[0091] Figure 12 is the profile image of the seismic record after conventional processing, Figure 13 It is the section image of the seismic record processed by the present invention. Compared with the two, the resolution ability of the seismic record after the process of the present invention is obviously improved. The part marked by the dotted circle in the two figures is the reflection of a large-scale fracture-cavity group. On the conventionally processed image, it looks like a large-scale fracture-cavity body. On the seismic image processed by the present invention, it is distinguished by A...

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Abstract

The invention discloses a mixed phase wavelet deconvolution method based on phase decomposition, which is applicable to seismic signal processing during seismic exploration. The method is characterized by comprising the following steps of: artificially stimulating and receiving seismic records; performing conventional seismic data processing such as noise suppression, deconvolution, velocity analysis and offset on the seismic records; estimating a seismic wavelet amplitude spectrum through a seismic record amplitude spectrum by employing a cepstrum separation method; obtaining a series of mixed phase wavelet sets with the same amplitude spectrum and different phase spectrums; determining the actual mixed phase seismic wavelets according to the variance norm after the deconvolution; setting the expected output zero phase seismic wavelets; calculating a deconvolution operator; performing convolution on the deconvolution operator and the seismic records; and drawing the seismic records to be a seismic section image which can reflect the underground structural characteristics. According to the method, the resolution ratio of the seismic records is improved, and the contents and the details of the underground structure can be clearly known.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a seismic signal processing method, which is a mixed-phase wavelet deconvolution method based on phase decomposition. Background technique [0002] Seismic exploration is an exploration method that uses artificial seismic technology to detect underground structures. It excites seismic waves near the surface in a certain way to produce seismic signals called seismic wavelets. The seismic wavelets propagate from the source to the ground. After encountering the geological interface, transmission and reflection occur at the interface. The transmitted seismic wavelets The wave continues to propagate downward, while the reflected wavelet propagates upward at the interface position, and its strength and polarity depend on the magnitude and sign of the interface reflection coefficient. Seismic wavelets from interfaces at different depths arrive at the surface at different ti...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 李国发周新源王招明杨海军彭更新谢会文秦得海满益志段文胜崔永福
Owner PETROCHINA CO LTD