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Combined Slope Tomography of First Arrival and Reflected Earthquake

A tomography and reflected wave technology, applied in the field of seismic data processing for oil and gas exploration, can solve problems such as differences in shallow and deep velocity models and different trends, and achieve the effect of strong applicability

Inactive Publication Date: 2019-02-01
OCEAN UNIV OF CHINA
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Problems solved by technology

However, the shallow and deep velocity models established by using different seismic data and methods inevitably have differences, and may even have different changing trends.

Method used

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  • Combined Slope Tomography of First Arrival and Reflected Earthquake
  • Combined Slope Tomography of First Arrival and Reflected Earthquake
  • Combined Slope Tomography of First Arrival and Reflected Earthquake

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Embodiment Construction

[0067] In order to make the purpose and technical solution of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0068] like figure 1 As shown, the joint slope tomography method of the first seismic arrival wave and reflected wave of the present invention comprises the following steps:

[0069] Step 1: Preprocessing of seismic data: Preprocessing includes denoising and gain. The purpose of denoising is to suppress random noise, improve the signal-to-noise ratio, and remove coherent noise, while the purpose of gain is to balance the energy distribution in the direction of the time axis;

[0070] Step 2: Slope and travel time data collection and quality control:

[0071] S1: Slope picking is realized in the common shot point gather and the common receiver point gather, and the slope corresponding to the maximum stacking energy is obtained by obliquely stacking the seismic trace envelope...

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Abstract

The invention, which belongs to the technical field of oil and gas exploration and seismic data processing, relates to a joint slope tomography method based on combination of a seismic first arrival wave and a reflected wave, so that a problem that superficial part and middle and deep part sped models that are established by different seismic data and methods have differences and even have different changing trends according to the existing rugged topography speed model construction method is solved. With simultaneous usage of a reflected wave slope and a first arrival wave slope, a slope tomography method based on combination of a seismic first arrival wave and a reflected wave is formed; and a unified complete speed model from a superficial part to a deep part is established and the model is suitable for a rugged landform situation, so that a precise macroscopic speed model is obtained even on the condition of a horizontal change of the near-surface speed. While joint slope tomography is realized, the first arrival wave and reflected wave information is used, so that the angle coverage of the ray is extended and the ray density is enhanced; and an inversion result better than the deviation speed analysis is obtained, so that the adaptability to a complicated situation is enhanced.

Description

technical field [0001] The invention relates to a combined slope tomographic imaging method of first seismic arrival wave and reflected wave, and belongs to the technical field of oil and gas exploration seismic data processing. Background technique [0002] Slope tomography is a tomographic imaging method proposed in 1998 to obtain a macroscopic velocity model by using the travel time and slope information of reflected waves. It was applied to marine seismic reflected wave data in 2000 and achieved good results. In the same year, 3D parallel slope tomography was realized and applied to offshore 3D seismic data in 2002. After that, the data picking work of slope tomography was experimented in various data domains, such as time domain or depth migration domain, post-stack time domain or pre-stack time migration domain, etc. Slope tomography has been extended to converted wave analysis, transmitted wave tomography, and wave propagation in anisotropic media, forming a variety ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/34
CPCG01V1/282G01V1/345G01V2210/74
Inventor 张建中金昌昆马飞张一鸣
Owner OCEAN UNIV OF CHINA
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