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Seismic wave collection method in which medium symmetry axis and observation coordinate axis are interchanged

A technology of observing coordinates and acquisition methods, which is applied in seismology, seismic signal processing, and measuring devices, etc., can solve the problems of lack of discussion on kinematic feature observation methods, and achieve the effect of simple structure, easy implementation, and reasonable scheme

Active Publication Date: 2019-08-27
CHANGAN UNIV
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Problems solved by technology

Although these methods have discussed the seismic wave response, numerical simulation methods and dynamic characteristics in fractured media to varying degrees, they are not enough for the kinematic characteristics of fast and slow shear waves after shear wave separation in fractured media and for the detection of anisotropic fractures by seismic waves. Observation methods for oil and gas reservoirs are still lacking in discussion

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  • Seismic wave collection method in which medium symmetry axis and observation coordinate axis are interchanged
  • Seismic wave collection method in which medium symmetry axis and observation coordinate axis are interchanged
  • Seismic wave collection method in which medium symmetry axis and observation coordinate axis are interchanged

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0031] Such as figure 1 As shown, in order to save costs, two mutually perpendicular survey lines are first laid out in the observation area, which are respectively denoted as survey line M and survey line N. Survey line M is along the x-axis, and survey line N is along the y-axis. After the source seismic source is excited, the wave field data acquisition is carried out, and the symmetry axis of the fractured medium is as follows: figure 1The direction shown is parallel to the x-axis. If the survey line along the x-axis is observed first, the concentrated force source will generate both longitudinal waves and shear waves in the anisotropic medium, and the shear waves will split after the shear waves pass through the cracks. However, the premise The condition is that the survey line is obliq...

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Abstract

The invention discloses a seismic wave collection method in which a medium symmetry axis and an observation coordinate axis are interchanged. The observation coordinate axis is established, a radial seismic line is deployed, and seismic wave information in a plurality of crack reservoirs can be obtained. The direction of the crack can be conveniently pre-judged by using fast and slow transverse wave information observed by the two perpendicular lines. The seismic source of the seismic wave collection method disclosed by the invention has three-dimensional spherical symmetry, thereby fully utilizing the effectiveness of instantaneous amplitude of the seismic source. According to the seismic wave collection method disclosed by the invention, the medium symmetry axis and the observation coordinate axis are interchanged for observation, so that the period and cost of predicting the crack reservoirs can be greatly reduced, in addition to the three-dimensional spherical symmetric distribution of a field source, an observation system has two-dimensional distribution properties, thereby being easy to implement and improving the exploration efficiency. The seismic wave collection method disclosed by the invention has the advantages of reasonable scheme, simple structure, easy realization, and capability of fully exerting the advantages of multiple measuring lines.

Description

technical field [0001] The invention belongs to the field of seismic exploration, in particular to a seismic wave acquisition method in which a medium symmetry axis and an observation coordinate axis are interchanged. Background technique [0002] The study of fractured oil and gas reservoirs has become a very important exploration field, which has the characteristics of small reservoir size, heterogeneity and strong anisotropy effect. In order to explore and develop fractured oil and gas reservoirs, it is first necessary to study the propagation characteristics of seismic waves in fractured reservoirs in order to analyze and interpret the actual data more reasonably. At present, most research and identification methods for fractured reservoirs are based on numerical simulation. The 3D model is the ideal and closest simulation of the actual medium, but it requires a lot of computer resources, and has high requirements for computer memory resources and CPU time. The convent...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/30
Inventor 全红娟朱婧朱光明徐春龙丁健潘渊
Owner CHANGAN UNIV
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