Method for increasing seismic imaging resolution ratio

A resolution and imaging technology, applied in seismic signal processing, etc., can solve problems such as inability to achieve dispersion correction at the same time, inability to respond to non-uniform Q values, and limiting the effectiveness of inverse Q filter viscosity compensation, etc.

Active Publication Date: 2013-12-04
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, unsteady deconvolution has many difficulties in estimating space-varying unsteady wavelets, and this method generally cannot achieve dispersion correction at the same time; because it is difficult to obtain non-uniform Q values, the current inverse Q filtering method More uniform Q value a...

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  • Method for increasing seismic imaging resolution ratio
  • Method for increasing seismic imaging resolution ratio
  • Method for increasing seismic imaging resolution ratio

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Embodiment 1

[0114] Embodiment 1: A method for improving seismic imaging resolution, taking the eastern onshore oilfield as an example, specifically the following steps:

[0115] (1) Use multiple streamers or survey lines to collect reflected seismic signals excited by artificial seismic sources, and record the seismic signals on magnetic tape. The specific acquisition parameters are: 12 survey lines record seismic signals at the same time, the survey line spacing is 80m, each survey line has 2801 geophone groups, and the geophone group spacing is 40m; the shot line is arranged along the vertical survey line direction, and the shot points are along the shot line The distance between the shot lines is 40m, and the line spacing between shot lines is 40m. A total of 5679 shots were collected, the recording length was 2.5s, and the time sampling was 1ms.

[0116] (2) Read the seismic signals from the tape to the computer, and perform conventional noise attenuation and pre-stack time migration ...

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Abstract

The invention discloses a method for increasing a seismic imaging resolution ratio and is applied to reflection seismic data processing in seismic exploration . The method includes that by performing frequency-dependent amplitude recovery and frequency dispersion correction on migration stack data volume, the resolution ratio of imaging is increased integrally, and the imaging resolution ratios of middle and deep structures are enabled to be close to the imaging resolution ratio of a shallow structure; amplitude recovery and frequency dispersion correction are performed based on a viscoelastic theory, but a nonuniform Q value field does not need to be provided in advance; viscous absorption of seismic waves is described by introducing an equivalence Q value, and the nonuniform equivalent Q value field needed for calculation is acquired by establishing a single numerical indicator and by utilizing parameter scanning. Compared with methods like unsteady-state deconvolution, the method has the advantages that high-frequency information is restored while frequency dispersion correction is completed; a stable control algorithm is introduced, so that stability of calculation is guaranteed. By the method, breaking of the middle and deep structures and stratum deposition forms can be indicated better; and the method has important application value for oil-gas and mineral resource exploration.

Description

technical field [0001] The invention belongs to the technical field of reflection seismic data processing in seismic exploration, relates to the technical category of migration imaging in the process of seismic data processing, and is a high-resolution processing method of seismic data capable of improving the resolution of seismic imaging. Background technique [0002] In oil and gas exploration, the identification of small faults and small faults is an important link in understanding the oil and gas dredging system and then identifying favorable reservoirs. Therefore, improving the resolution of seismic imaging has always been an important goal in the processing of reflection seismic data in seismic exploration. [0003] There is viscous absorption in the actual earth medium, and the small-scale inhomogeneity of the earth medium will also produce an amplitude attenuation effect similar to viscous absorption. These objective existences lead to the absorption and attenuatio...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 张剑锋吴吉忠
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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