Method for matching longitudinal wave and converted wave data through dynamic time adjustment

A technology of dynamic time adjustment and converted waves, applied in the field of seismic exploration, can solve the problem of low matching accuracy and achieve the effect of broad application prospects

Active Publication Date: 2014-12-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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Problems solved by technology

[0006] In order to solve the problem of low matching accuracy in the existing time matching method and attribute-driven method, the present invention further pro

Method used

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  • Method for matching longitudinal wave and converted wave data through dynamic time adjustment
  • Method for matching longitudinal wave and converted wave data through dynamic time adjustment
  • Method for matching longitudinal wave and converted wave data through dynamic time adjustment

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Embodiment 1

[0050] Step 1) In the field, use a longitudinal wave source to excite seismic waves and use a geophone to record seismic waves, perform high-fidelity processing on the collected data according to the conventional seismic data processing flow, and generate a normal time difference corrected longitudinal wave whose amplitude changes with the offset gathers and converted wave gathers; figure 1 is the log curve containing density, compressional wave velocity and shear wave velocity; Figure 2A and Figure 2B respectively by figure 1The longitudinal wave gathers and converted wave gathers whose amplitude varies with the offset obtained from the forward modeling of medium logging curves.

[0051] Step 2) Inversion of the variation of amplitude with offset is performed on the longitudinal wave gathers and converted wave gathers formed in step 1). Firstly, analyze the incident angle of the longitudinal wave gather, and select a suitable incident angle range, such as 0-35°, to avoid...

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Abstract

The invention provides a method for matching longitudinal wave and converted wave data through dynamic time adjustment. The method includes the steps that acquired seismic waves are processed through normal moveout correction and the like to generate a longitudinal wave gather with amplitude changing along with offset and a converted wave gather with amplitude changing along with offset; inversion of changes of amplitude along with offset is performed on the longitudinal wave gather and the converted wave gather respectively, and an attribute set of changes of amplitude along with offset of longitudinal waves and an attribute set of changes of amplitude along with offset of converted waves are obtained; the attribute set of changes of amplitude along with offset of longitudinal waves and the attribute set of changes of amplitude along with offset of converted waves are calculated based on dynamic time adjustment, and the time shift quantity sequence between the longitudinal waves and the converted waves is obtained; time shift is performed on the converted wave gather according to the time shift quantity sequence, and a converted wave data set is obtained after the converted wave gather is matched in the time domain of longitudinal waves. Through the method, the time shift quantity of each sampling point can be obtained so that the method is adaptive to intense changes of the time shift quantities and free of influences of relevant time windows and thresholds, and a good result can also be obtained on the basis of data with a low signal-to-noise ratio and resolution ratio.

Description

technical field [0001] The invention relates to a method for matching longitudinal wave and converted wave data by using dynamic time adjustment, and belongs to the technical field of seismic exploration. Background technique [0002] In the existing seismic exploration technology, the joint analysis of P-wave (PP: P-wave incident, P-wave reflection) and converted wave (PS: P-wave incident, S-wave reflection) can improve structural imaging, lithology estimation, anisotropy analysis, fluid prediction and the accuracy and reliability of reservoir description. In the joint analysis process, time matching of longitudinal (PP) and converted wave (PS) events is a very important and difficult step. [0003] Due to the difference in the propagation and reflection mechanism of the longitudinal wave and the shear wave, there are differences in the travel time and waveform of the underground reflection interface on the longitudinal wave section and the converted wave section. These di...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 张铁强孙鹏远钱忠平黄娜尹天奎
Owner BC P INC CHINA NAT PETROLEUM CORP
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