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Method for increasing seismic data resolution by applying sonic logging information constraint inversion

A technology for constraining inversion and logging data, applied in seismic signal processing and other directions, it can solve the problem of not meeting the requirements of high resolution, and achieve the effects of no distortion of amplitude, improved resolution, and no reduction of signal-to-noise ratio.

Active Publication Date: 2013-11-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, if 20Hz is increased to 40Hz, and 50Hz is increased to 70Hz, the resolution thickness can be reduced to 25m and 15m respectively, but it is still far from meeting the high-resolution requirements of oil and gas exploration and development.

Method used

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  • Method for increasing seismic data resolution by applying sonic logging information constraint inversion

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Effect test

Embodiment 1

[0025] according to figure 1 , can complete high-resolution inversion.

[0026] The first step is to input the acoustic wave and density logging data, and convert the acoustic wave data into velocity data;

[0027] In the second step, the velocity is multiplied by the density to obtain the wave impedance, and then the reflection coefficient is calculated;

[0028] The third step is to give the wavelet (Lake wavelet or other types of wavelet) and the main frequency of the wavelet;

[0029] The fourth step is to find the synthetic record through the convolution algorithm;

[0030] The fifth step is to establish the relationship between the synthetic record and the seismic record, and the method for establishing the relationship is not limited;

[0031] In the sixth step, the relationship is applied to all seismic traces to obtain an inverted high-resolution ratio section or data volume.

[0032] The invention is a method for improving the resolution of seismic data by means ...

Embodiment 2

[0037] The ability of seismic data to distinguish thin layers is mainly reflected in high frequency, but because the high frequency energy is weak, it is submerged in noise and difficult to observe. Seismic data has a similar physical mechanism and physical connection, so a correlation relationship between well logging data and side-hole seismic traces is established to increase seismic high-frequency energy, thereby achieving the purpose of improving resolution. Finally, the established relationship is applied to all seismic channels to improve the resolution of the entire seismic data.

[0038] The specific implementation process is as follows:

[0039] In an exploration and development area, or a geological structure, there are already more than one drilling wells, and these wells have been logged, and the logging data must have sound waves and density (it is better to have density, but it is also possible without it). In this area (or geological structure), seismic explor...

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Abstract

The invention discloses a method for increasing seismic data resolution by applying sonic logging information constraint inversion. The method has the characteristics that a relationship is established between a high-resolution synthetic record of logging information and seismic data, and energy of a high-frequency component in the seismic data is improved, so that the seismic data resolution is increased; the high-frequency component of the seismic data is submerged in noise; the general method for increasing the resolution with deconvolution difficultly achieve a purpose; the capacity for increasing the resolution is very limited; and the high-frequency energy can be extracted effectively by adopting the mode that the high-resolution synthetic record of the logging information is combined with the seismic data.

Description

technical field [0001] The invention relates to a method for improving the resolution of seismic data by constrained inversion of acoustic logging data, and belongs to the field of seismic data processing for exploration and development of oil and gas fields. Background technique [0002] In oil and gas seismic exploration, seismic waves excited by explosives and other seismic sources propagate underground. Due to the absorption and attenuation of the earth, the high and low frequency energy gradually weakens. The low frequency energy attenuates less and the high frequency energy attenuates more. As the propagation depth increases, the high frequency becomes less and less, the low frequency becomes more and more prominent, and the main frequency becomes lower. The main frequency components of current seismic data are generally between 20Hz and 50Hz, higher in shallow layers and lower in deep layers. [0003] The formation thickness resolution is related to the main frequenc...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/32
Inventor 吴大奎戴勇吴宗蔚徐明华
Owner BC P INC CHINA NAT PETROLEUM CORP
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