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Complicated earth surface banding earthquake collection method

A technology with complex surface and acquisition methods, applied in the field of petroleum seismic exploration, to achieve the effect of suppressing spatial interference

Active Publication Date: 2008-01-16
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

[0006] The present invention aims at the limitations of existing two-dimensional seismic acquisition methods in solving seismic exploration problems in complex surface areas, and provides a strip seismic acquisition method that is beneficial to suppress spatial scattering interference in seismic data processing

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  • Complicated earth surface banding earthquake collection method
  • Complicated earth surface banding earthquake collection method

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Embodiment Construction

[0024] A gas field has been discovered in a structural belt, and the density of the seismic survey network has reached 1×2-2×2km in the past, and the survey network has been intensified in the local structural area, and the seismic survey line has been intensified to 1×1-1×1.5km. The quality has improved, but the stratigraphic structure is still not very clear, and the breakpoint structure is not yet fully implemented.

[0025] The multi-line reception is adopted in the strip seismic prospecting method, and the number of reception lines is determined according to the specific geophysical parameters. The specific determination method is as follows:

[0026] First, determine the line spacing ΔL of the two receiving lines according to the absence of spatial aliasing in the horizontal direction, ΔL≤v / (4Fsinα), V: the root mean square velocity of the target layer, F: the main frequency of the target layer, α: the maximum inclination angle of the target layer. The known geophysical ...

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Abstract

The invention relates to a petroleum seismic exploration technique complex ground surface area banded seismic collection method, which comprises the following steps: 1) multi-line reception is adopted; the number of the reception lines is determined by the known parameter; spatial aliasing is not generated between any two adjacent reception lines; 2) the positions of two adjacent reception lines are in parallel; 3) shotpoints are set within the band area according to the ground surface and near ground surface geological condition; 4) seismic data is collected; seismic section plane is formed by the utilization of 3D processing method. The selection of shotpoints and the detection points in the invention is in line with the specific conditions, convenient and flexible and can effectively suppress space disturbance by level overlap in the course of document processing; the document quality is approximate to the 3D seismic exploration noise reduction effect; the invention is suitable for 2D exploration in ground surface area.

Description

technical field [0001] The invention belongs to petroleum seismic exploration technology, and in particular relates to a two-dimensional seismic acquisition method for complex surface areas. Background technique [0002] When performing two-dimensional seismic acquisition, complex surface conditions are often encountered, such as: severe topography, vertical and horizontal gullies, high and steep underground strata exposed to the surface, developed faults, and relatively fragmented strata. These complex surface structures will become ground interference sources one by one during seismic data acquisition, resulting in serious spatial scattering phenomena. Since these disturbances come from all directions in space and have no fixed rules, if the seismic data is not effectively suppressed during seismic data acquisition, subsequent seismic data processing cannot be eliminated, which will directly affect the quality of the seismic section, mainly manifested as seismic section re...

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Application Information

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IPC IPC(8): G01V1/22
Inventor 王卫华严峰高国成苏欢欢施海锋刘新文张华财段孟川
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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