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Method of separating surface-related multiples of different orders in seismic exploration data

A technology of seismic exploration and multiple waves, which is applied in the field of seismic exploration data processing, can solve the problems that multiple waves cannot be directly separated, and achieve the effects of wide application range, reliable principle, and clear technical process

Active Publication Date: 2017-01-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for separating surface multiples of each order in seismic exploration data, aiming at solving the difficult problem that surface multiples of each order cannot be directly separated in the processing of seismic exploration data, so as to realize the separation of surface multiples of each order. The effective use of secondary waves can obtain rich interface information contained in surface multiple waves of different orders, and provide a data basis for more detailed imaging of subsurface structures

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  • Method of separating surface-related multiples of different orders in seismic exploration data
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  • Method of separating surface-related multiples of different orders in seismic exploration data

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Embodiment 1

[0026] The method for separating surface multiple waves of various orders in the seismic exploration data involved in this embodiment includes the following steps:

[0027] S101: Input seismic records, use SRME to extract primary waves:

[0028] For the seismic records containing surface multiples collected by the geophone, the SRME method is used to separate the primary wave from the surface multiples as a whole, and extract the primary wave;

[0029] S102: Positive focus transformation to obtain focus domain results:

[0030] Using the primary wave separated in step S101 to construct a focusing operator, P 0 Represents the primary wave data matrix, and the defocusing operator G uses the primary wave data matrix P 0 Indicates that the positive focusing operator F is expressed as the inverse P of the anti-focusing operator 0 -1 , using the constructed positive focus operator to perform positive focus transformation on the original seismic records to obtain the focus domain...

Embodiment 2

[0047] In this embodiment, the surface multiple wave separation method of each order in the seismic exploration data is used to separate the seismic data containing surface multiple waves in the forward modeling of the three-layer medium model. Since the surface multiple waves in the forward modeling seismic records in this embodiment are First-order and second-order main, the separation process of first-order (N=1) and second-order (N=2) surface multiples will be described in detail below, and the specific steps are as follows:

[0048] (1) The SRME method is used for the forward modeling shot records containing surface multiples to separate the primary waves from the surface multiples as a whole, and to extract the primary waves. The original single-shot seismic records are as follows: image 3 As shown in (a), due to the existence of free surface and strong reflection interface, surface multiples of different orders with strong energy are generated in the shot record, and th...

Embodiment 3

[0065]In this embodiment, the surface multiple wave separation method of each order in the seismic exploration data is used to separate the surface multiple waves of each order from the seismic data containing multiple waves of complex geological bodies. The specific results are as follows:

[0066] Figure 5 It is a schematic diagram of the velocity field of complex geological bodies. In the figure, complex high-steep formations and high-velocity salt bodies can be seen. The formation at 300m-600m is used to simulate the seabed interface. Figure 6 is the result of the separation of surface multiple waves of different orders, Figure 6 (a) is the original single-shot seismic record, composed of Figure 6 (a) It can be seen that the wave field in the seismic record is complex, and the surface multiples of different orders have strong energy and intersect with each other; Figure 6 (b), Figure 6 (c), Figure 6 (d) and Figure 6 (e) are the separated primary waves, first-o...

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Abstract

The invention belongs to the technical field of seismic exploration data processing, and relates to a method of separating surface-related multiples of different orders in seismic exploration data. The problem that surface-related multiples of different orders cannot be separated directly in seismic exploration data processing is solved. Effective use of surface-related multiples of different orders is realized. The method combines the weighted cross-correlation idea of focus transformation and the weighted convolution idea of SRME (Surface-Related Multiple Elimination). Firstly, primaries are separated from the overall surface-related multiples of different orders through SRME; secondly, order reduction of the surface-related multiples of different orders is realized through forward focus transformation; thirdly, a quasi-seismic record is extracted through non-stationary matched filtering; fourthly, quasi-primaries in the quasi-seismic record are extracted through SRME; and finally, the order of the quasi-primaries is increased through reverse focus transformation, the quasi-primaries are returned to an original data field, and separated surface-related multiples of different orders are acquired. A reasonable and effective method of separating surface-related multiples of different orders is put forward systematically to realize effective separation of surface-related multiples of different orders. The method has the advantages of reliable principle, clear technical process, and wide application scope.

Description

Technical field: [0001] The invention belongs to the technical field of seismic exploration data processing, and relates to a method for separating surface multiple waves of various stages in seismic exploration data. Background technique: [0002] There are developed multiple waves in the seismic data collected by ocean and some land seismic surveys. In traditional seismic data processing, multiple waves are usually regarded as noise and need to be removed before imaging. However, multiple waves are also true reflections from the formation interface, with small reflection angles, long propagation paths, and wide coverage. Therefore, many In recent years, the effective use of secondary waves has become a hot spot of widespread concern to geophysicists, especially the research on the effective use of surface multiple waves is more in-depth, because the energy of surface multiple waves is strong and has a typical periodicity. The multiple reflections that occur will generate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 李志娜李振春王鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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