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Three-dimensional tomography method based on seismic wave in-phase axis slope information

A technology of event slope and three-dimensional tomography, applied in the field of exploration seismology, achieves high reliability, improved condition number, and improved accuracy

Inactive Publication Date: 2019-02-26
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] However, currently only two-dimensional slope tomography algorithms have been proposed for macroscopic velocity modeling of actual seismic data, and the algorithm has not been extended to three-dimensional, and three-dimensional slope tomography needs to solve more problems, such as slope in three-dimensional seismic data Efficient extraction and quality inspection of information, establishment of three-dimensional slope tomographic matrix, and more powerful regularization term acquisition

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  • Three-dimensional tomography method based on seismic wave in-phase axis slope information
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  • Three-dimensional tomography method based on seismic wave in-phase axis slope information

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[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] As shown in Fig. 1(a) and Fig. 1(b), the present invention firstly describes the implementation process of two-dimensional slope tomography. Figure 1(a) shows a schematic diagram of the model and data components of two-dimensional slope tomography. The tomographic data space and the underground model space are respectively established according to the actual seismic observation data. Among them, the observed data in Figure 1(a) is extracted from the actual seismic data, the forward modeling data It is the data space obtained based on ray forward modeling in the inversion process. The essence of tomographic inversion is to use the data residual to obtain the model residual. When the model residual is applied to the initial model, the initial model is updated. The current round of inversion work is completed; the new data space d can be obtai...

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Abstract

The invention relates to a three-dimensional tomography method based on seismic wave in-phase axis slope information. The method comprises the steps that 1) effective data picking is carried out on athree-dimensional common shot point gather and a common detection wave point gather to acquire horizontal component information of ray parameters at shot points and detection wave points; 2) a three-dimensional slope tomographic matrix is established according to the acquired horizontal component information of the ray parameters at the shot points and detection wave points; 3) a regularization term is added into the linear equations of the established three-dimensional slope tomographic matrix to acquire large-scale sparse linear equations; and 4) the large-scale sparse linear equations are solved to acquire a macroscopic velocity model of slope tomographic inversion, and the model is used for three-dimensional migration imaging or as an initial model of three-dimensional full waveform inversion. The method provided by the invention can be widely applied in the field of exploration seismology.

Description

technical field [0001] The invention relates to the field of exploration seismology, in particular to a three-dimensional tomographic imaging method based on the slope information of the seismic wave event. Background technique [0002] Macroscopic velocity model estimation is the most important parameter extraction work in exploration seismology, and the full-waveform inversion method for full-bandwidth velocity modeling has become an international research hotspot in recent years. However, in the field of exploration seismology, any advanced algorithm must be strictly tested by actual data before its value can be finally judged. Due to the lack of low-frequency information in actual seismic data, noise interference, wavelet estimation, and the existence of various complex wave phenomena that are difficult to describe in existing theories, the convexity of the objective function of waveform inversion is poor. Encountered various difficult problems. In contrast, the tomogr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/16
CPCG01V1/16G01V1/282G01V2210/514G01V2210/74
Inventor 刘春成杨锴陈宝书薛冬叶云飞陶杰管西竹
Owner CHINA NAT OFFSHORE OIL CORP
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