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Seismic data imaging method for carbonate rock fault in igneous rock complex area of and equipment

A technology of seismic data and carbonate rock, applied in the direction of seismic signal processing, etc., can solve the problems of weak effective signal of seismic data, low resolution unfavorable to concealed fractures, etc., to improve imaging accuracy, strong operability, and rich theory The effect of technical methods

Active Publication Date: 2019-05-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Surface deserts have absorption and attenuation effects on seismic signals, the effective signal of Ordovician carbonate strata seismic data is weak, and the low resolution of Cambrian is not conducive to the identification of hidden faults and secondary faults

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  • Seismic data imaging method for carbonate rock fault in igneous rock complex area of and equipment
  • Seismic data imaging method for carbonate rock fault in igneous rock complex area of and equipment
  • Seismic data imaging method for carbonate rock fault in igneous rock complex area of and equipment

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Embodiment Construction

[0061] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0062] Focusing on the velocity modeling of "three layers and one area" is an important idea to improve the imaging accuracy of deep carbonate fault-karst bodies underlying igneous rocks. The accuracy of velocity modeling and the reliability of imaging algorithms are the key to the quality of seismic imaging. For the key layers and target layers, on the basis of in-depth study of the seismic signal characteristics, through fine carving velocity...

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Abstract

The invention, which belongs to the field of seismic signal processing, particularly relates to a seismic data imaging method for a carbonate rock fault in an igneous rock complex area of and equipment. The method comprises: pre-processing seismic data to obtain amplitude-preserved seismic gather data; with a fine-engraving technique of the igneous rock under geological constraints, establishing apermian-system igneous formation velocity model; acquiring seismic data of a dominant frequency band by using a frequency division processing method and establishing a background velocity model of the Ordovician strata and the Cambrian strata; carrying out fault-controlling Gaussian beam tomography under the constraints of seismic attributes and updating a velocity model at the deep fault to obtain a high-precision velocity model; and acquiring a high-precision imaging result by using the broadband RTM imaging technology. Therefore, the imaging precision of the seismic data processing of thesubsurface deep fault under the igneous rock at the desert surface is improved; and thus the technical support for the seismic imaging of the fault in the Shunbei oil and gas field and similar background regions at home and abroad is provided.

Description

technical field [0001] The invention belongs to the field of seismic signal processing, in particular to a method and equipment for seismic data imaging of carbonate rock fault-karst bodies in complex igneous rock areas. Background technique [0002] In the complex igneous rock area in the desert hinterland of the Tarim Basin, affected by the Permian volcanic activities, the igneous rocks in the area are very developed, and the Permian igneous rock strata have large lithological changes (dacite, basalt, pyroclastic rock, etc.), The horizontal distribution is discontinuous and the vertical thickness is uneven. Due to the large variation of seismic wave propagation velocity in igneous rocks of different lithologies, false anticlines, false synclines or false faults appear in the overlying igneous rocks in time-domain seismic data imaging. If Velocity modeling is inaccurate, and even pre-stack depth migration cannot solve the impact of igneous rocks on the imaging of the underl...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 李宗杰马学军李赋斌杨子川张永升费建博杨威周刚张庆
Owner CHINA PETROLEUM & CHEM CORP
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