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A Noise Attenuation Method for Land Inspection of Submarine Cables

A submarine cable and noise technology, which is applied in the attenuation field of submarine cable land survey noise, can solve the problems that data cannot be recovered well, satisfactory results cannot be achieved, and changes in amplitude and phase cannot be well described.

Active Publication Date: 2020-07-07
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0005] In summary, the current research on the noise attenuation of submarine cable ground survey based on 3D high-order high-resolution τ-p transform has the following problems: 1. The low signal-to-noise ratio of land survey data affects the combination effect of double survey data
2. The 2Dτ-p transformation cannot achieve satisfactory results for the data of the 3D acquisition system
3. The traditional 3Dτ-p transform cannot describe the amplitude and phase changes very well, and it cannot recover the data with amplitude changes very well.

Method used

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  • A Noise Attenuation Method for Land Inspection of Submarine Cables
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  • A Noise Attenuation Method for Land Inspection of Submarine Cables

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as figure 1 As shown, the present invention provides a kind of attenuation method of submarine cable ground survey noise, and it comprises the following steps:

[0033] 1) Using 3D high-order τ-p inverse transformation to simulate the original land survey seismic data with AVO (amplitude variation with offset) phenomenon, the land survey original seismic data is three-dimensional time domain seismic data;

[0034] Such as image 3As shown, the simulated land survey seismic data generated by 3Dτ-p inverse transformation has common receiver point shear-wave interference, in which the effective signal presents a hyperbolic form, and the shear-wave interference presents a low-frequency, low-noise linear form.

[0035] 2) Use 3D high-order and high-resolution τ-p transform to perform τ-p forward transformation on the original seismic data gen...

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Abstract

The invention relates to a submarine cable land inspection noise attenuation method, comprising the following steps: simulating land inspection original seismic data with an AVO phenomenon by utilizing 3D high-order Tau-p inverse transformation; performing Tau-p direct transformation on the original seismic data by adopting 3D high-order high-resolution Tau-p transformation, so that Tau-p domain seismic data is obtained; setting slope parameters, and performing zero setting processing less than a threshold value on the Tau-p domain seismic data; inputting the Tau-p domain seismic data after zero setting into the 3D high-order high-resolution Tau-p transformation and performing Tau-p inverse transformation on the 3D high-order high-resolution Tau-p transformation, and transforming into a time domain, so that noise data is obtained; and subtracting the noise data obtained through the inverse transformation from the original seismic data, thus the original seismic data after a noise is removed is obtained. The method provided by the invention meets high resolution, sparsity and amplitude preservation of transverse wave interference of submarine cable land inspection and requirements of a 3D acquisition system.

Description

technical field [0001] The invention relates to a noise attenuation method, in particular to a method for attenuating noise of submarine cable land survey based on 3D amplitude-preserving sparse τ-p transformation. Background technique [0002] With the rapid development of the economy and the major adjustment of the international energy development strategy, the difficulty of onshore exploration has increased and the available resources have decreased. People have gradually shifted their exploration targets to offshore oil and gas exploration. Offshore oil and gas resources are abundant. Only my country's South China Sea oil reserves are at least 23 billion to 30 billion tons, accounting for about one-third of China's total resources. The technology of exploration and development of offshore oil and gas fields has developed rapidly in countries all over the world in recent decades. After the offshore oilfield enters the development period, due to obstacles such as offshore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/306
Inventor 张金淼李景叶朱振宇郝振江王爽王小六陈小宏糜芳张云鹏王艳冬黄小刚
Owner CHINA NAT OFFSHORE OIL CORP
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