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Method for generating transverse wave seismic section by longitudinal wave source multi-component earthquake data

A technology of seismic data and seismic section, which is applied in the field of petroleum seismic exploration data processing, can solve problems such as multi-solution uncertainty, inaccuracy, and indirect shear wave section method, and achieve the effect of improving the accuracy of static correction

Active Publication Date: 2009-04-29
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Since the shear wave is not affected by the fluctuation of the water table near the surface, there is almost no relationship between the static correction of the longitudinal wave and the shear wave, and it is usually incorrect to approximate the static correction of the shear wave by multiplying the static correction of the longitudinal wave by a certain coefficient
Therefore, the method of inverting the shear wave profile from the longitudinal wave data is not direct, and there will be multiple solutions and uncertainties in the inversion

Method used

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  • Method for generating transverse wave seismic section by longitudinal wave source multi-component earthquake data
  • Method for generating transverse wave seismic section by longitudinal wave source multi-component earthquake data
  • Method for generating transverse wave seismic section by longitudinal wave source multi-component earthquake data

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Embodiment Construction

[0038] Concrete implementation steps of the present invention are:

[0039] 1. The explosion source is used for excitation in the field, and the three-component geophone is received. Through the test, the appropriate well depth and excitation lithology are selected to maximize the energy of the excited shear wave. At the same time, the converted wave reflection energy is taken into account to complete the acquisition of three-component seismic data ( figure 1 );

[0040] 2. Use the heavy hammer to strike the direction finding method of the compression sleeper or the shear wave vibrator to excite the shear wave, and the three-component geophones in the well or on the ground receive it at a certain interval (Figure 2), and complete the interpretation of the surface longitudinal wave and shear wave velocity by picking up the first arrival wave , through multi-point surveys in the construction area to establish surface P-wave and S-wave velocity models in the construction area (Fi...

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Abstract

The invention relates to a method for generating a transverse wave seismic cross section by using longitudinal wave source multi-component seismic data in petroleum seismic exploration. The method comprises the following steps: acquiring three-component seismic data by adopting multiple coverings; exciting the transverse wave and receiving the transverse wave in a well; acquiring transverse wave field static correction value and the rest static correcting value for performing transverse speed analysis; determining muting parameters, deconvolution parameters and wave filtering parameters according to wave field characteristics actually acquired and recorded, and finishing the prior pre-stack processing; and selecting stack and post-stack migration or pre-stack migration according to the complexity of the structure and a speed field for generating the cross section. The method directly utilizes data acquired by a longitudinal wave source excited three-component detector to extract the whole process reflection transverse wave for imaging, does not need special transverse wave acquisition, utilizes the transverse wave speed dynamic correction to solve transverse wave rest static correction value at a shot point, and iterates the transverse wave rest static correction value with the speed analyzing process, thereby obtaining a transverse wave imaging cross section with high static correction precision, as well as the speed field corresponding to the cross section and other parameters.

Description

technical field [0001] The invention relates to petroleum seismic exploration data processing, in particular to a method for generating a shear wave seismic profile by using multi-component seismic data of a longitudinal wave source. Background technique [0002] Oilfield development largely depends on the success rate of drilling, and the improvement of drilling success rate is closely related to the accuracy and reliability of seismic exploration results. The current exploration technology mainly uses longitudinal wave exploration to obtain underground structure information, and then comprehensively utilizes other existing data to determine the drilling position. For lithologic reservoirs or fractured reservoirs, shear wave or converted wave data can be used to obtain more subsurface physical and lithological information, thereby reducing exploration ambiguity and development risks, improving drilling success rate, and more effectively promoting oilfield development effic...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 李彦鹏孙鹏远陈海峰岳媛媛
Owner BC P INC CHINA NAT PETROLEUM CORP
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