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Spatial Simultaneous Imaging Processing Method for 2D Vertical Seismic Section and 3D Surface Data

A vertical seismic profile and seismic data technology, applied in seismic signal processing and other directions, can solve problems such as errors, achieve the effects of reducing uncertainty, improving imaging effect, and expanding the effective imaging range

Active Publication Date: 2017-05-03
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

(4) When the migrated image of Walkaway VSP data is embedded into the surface seismic data image, the error caused by the boundary effect (at the boundary of the migrated image, the phenomenon of arc drawing due to insufficient data volume)

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  • Spatial Simultaneous Imaging Processing Method for 2D Vertical Seismic Section and 3D Surface Data

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Embodiment Construction

[0026] The invention includes: (1) Three-dimensional grid fitting of Walkaway VSP data in any direction. (2) Extraction of the three-dimensional layer velocity model along the Walkaway direction. (3) The migration aperture calculation technology and travel time design of Walkaway VSP data based on 3D surface seismic data observation. (4) Walkaway VSP datum extension and 3D surface seismic data synchronous integration and summation technology.

[0027] Its concrete implementation steps of the present invention are:

[0028] 1) At different positions on a straight line on the ground, artificially stimulate seismic waves, use geophones to receive them in the well, and obtain the original Walkaway VSP shot data, process and correct this data and 3D ground seismic data to the data specified by the processing parameters Datum surface (such as CMP surface, etc.);

[0029] Step 1) The processed and corrected Walkaway VSP data are shot data, and the 3D ground seismic data are CMP ga...

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Abstract

The invention relates to a spatial synchronization imaging processing method of two-dimensional vertical seismic profiles and three-dimensional ground surface data in petroleum geophysical exploration. The method include dividing grids, allowing Walkaway VSP imaging points to overlap with seismic data grids, reading the interval velocity along the Walkaway direction as a common interval velocity model for prestack depth migration, estimating the depth migration aperture, calculating the total travel time of data track positions, calculating own data of same step lengths downwardly, accumulating and imaging synchronously, and acquiring depth migration profiles and common imaging point gathers. By the aid of the method, synchronous imaging of integral-method prestack depth migration of Walkaway VSP data and three-dimensional ground surface seismic data in a three-dimensional space is implemented. The effective imaging range of the VSP data in the Walkaway observing manner is expanded, the imaging capability is compensated by utilizing the ground surface data, and the imaging effect of steep stratum is improved.

Description

technical field [0001] The invention relates to vertical seismic profile (VSP) exploration technology and ground seismic exploration technology in petroleum geophysical exploration, in particular to a space synchronous imaging method of two-dimensional vertical seismic profile and three-dimensional ground data. [0002] technical background [0003] Seismic exploration is the use of artificial excitation of seismic waves to find underground minerals. By artificially exciting seismic waves, using recording equipment on the surface or underground to obtain data that changes with the propagation of seismic waves in a corresponding observation manner. The data obtained in three-dimensional space by seismic survey using surface sources and receivers is called 3D surface seismic data. The process of using surface seismic source excitation and using receivers to record seismic signals at different depths underground to obtain underground information near the wellbore is called vert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 凌云李少英郭向宇高军刘杏
Owner BC P INC CHINA NAT PETROLEUM CORP
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