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Method of conducting seismic frequency extension by utilizing acoustic logging

A technology of side-hole seismic traces and sound waves, which is applied in the fields of seismology and seismic signal processing for well logging records, can solve the problems of effect measurement accuracy and other problems, and achieve the effect of improving seismic resolution and widening the frequency band

Inactive Publication Date: 2013-10-02
ZHEJIANG UNIV
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Problems solved by technology

However, its effect is affected by the measurement accuracy limitation of the quality factor Q

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  • Method of conducting seismic frequency extension by utilizing acoustic logging
  • Method of conducting seismic frequency extension by utilizing acoustic logging
  • Method of conducting seismic frequency extension by utilizing acoustic logging

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing.

[0028] The technical scheme of the present invention is: use the wave impedance reflection coefficient sequence obtained by the acoustic wave and density logging data of a known well to perform convolution with a selected broadband wavelet, and obtain the broadband synthetic seismic record with the corresponding time The side-well seismic traces in the window are compared, and the longitudinal inverse filter is obtained according to the principle of least square inverse filtering, and the amplitude and phase difference between the side-well seismic traces and any seismic traces between wells are compared and analyzed. The same principle can be used to obtain the transverse inverse filter . The combined effect of the vertical and horizontal inverse filters is to obtain a frequency extension series inverse filter, which is applied to the post-stack seismic section and achieve...

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Abstract

The invention discloses a method of conducting seismic frequency extension by utilizing acoustic logging, which comprises the following steps: making a wide-band synthetic seismic record through a reflection coefficient sequence obtained by acoustic logging date and density logging data, and selected high frequency seismic wavelet; comparing the synthetic wide-band seismic record with cross-well seismic traces to obtain a law of longitudinal high-frequency signal loss caused by a low-pass stratum filter; meanwhile, utilizing the contrastive analysis of a near-well seismic record and any seismic trace on a cross-well section to obtain the filter effect of lateral variation of the stratum; and by studying the amplitude spectrum properties of the filter, summarizing the properties of a longitudinal filter and a transversal filter on a seismic stack section, designing a frequency extension series inverse filter with longitudinal frequency loss and transversal frequency change, and using the frequency extension series inverse filter on a cross-well seismic stack section to achieve the purposes of extending the bandwidth and improving a stacked reflective seismic section resolution, and provide more detailed and reliable seismic information for the elaboration and the dynamic monitoring of oil and gas reservoir.

Description

technical field [0001] The invention relates to a seismic frequency expansion method using acoustic logging, in particular to an effective method for longitudinal high-frequency compensation and lateral variation matching of seismic signals by using frequency expansion series inverse filters to widen the frequency band and improve the resolution of seismic signals. Background technique [0002] Seismic logging combined technology was mainly used in lithological interpretation and reservoir prediction in the past. It mainly uses synthetic seismic records to determine the geological horizon of the reflection layer, identify multiple reflection waves, and realize horizon calibration. However, it often results in high-resolution Logging information is reduced to low-resolution seismic trace information. [0003] The conventional method of seismic frequency extension technology is mainly the inverse Q filter, which is to design the inverse filter factor according to a certain abs...

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Application Information

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IPC IPC(8): G01V1/40G01V1/28
Inventor 田钢李曦宁沈洪垒石战结陈燃
Owner ZHEJIANG UNIV
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