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Method for setting seismic acquisition and observation system

An observation system and seismic source technology, applied in the field of seismic acquisition and observation system setting, can solve the problems of low signal-to-noise ratio and low resolution in exploration

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for setting up a seismic acquisition and observation system to solve the problems of low exploration signal-to-noise ratio and resolution in the current seismic acquisition and observation system

Method used

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  • Method for setting seismic acquisition and observation system
  • Method for setting seismic acquisition and observation system
  • Method for setting seismic acquisition and observation system

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Embodiment

[0063] In a central and western loess plateau area, the loess coverage of the target area is thick, the topographical undulations are large, the surface structure is complex, the speed of the low-velocity zone, and the lateral variation of thickness are large.

[0064] The shallow surface model is established by collecting shallow well data and small refraction interpretation of the bedrock bottom interface. Except for the relatively flat surface in the northwestern part of the target area, all blocks are the loess plateau topography of gully, plateau, beam, and mound. Features, the maximum height difference of the terrain is more than 300 meters. The thickness of the loess plateau is generally thicker from east to west, with a maximum thickness of more than 400 meters. The deep geophysical parameters of the work area are established based on prior deep well data and geological structure evolution. From shallow to deep, the reservoir target layers are the Yan’an Formation at 1...

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Abstract

The invention relates to a method for setting a seismic acquisition and observation system and belongs to the technical field of oil and gas seismic exploration. The method comprises the following steps: manufacturing a geologic model of a testing zone with undulating surface according to data provided by surveying and mapping and geological annotation data explored at the early stage; reversely spreading a seismic wave field along the geologic model by utilizing a reciprocity principle in the geologic model and taking a target reservoir stratum as a plane wave seismic focus; discretely solving wave equation by a staggered grid high-order finite difference numerical value simulation technology; processing the boundary of the undulating surface by a numerical value boundary absorption technology; calculating the illumination intensity distribution of the geologic model in the target zone; and optimally arranging the positions of the seismic focus point and the detection point by analyzing the illumination intensity of the earth surface. Compared with optimal observation system method such as a field point test and the like, the method provided by the invention is economic and practical, saves the construction cost, optimally analyzes the whole target zone and avoids blind zone and drain zone.

Description

technical field [0001] The invention relates to a method for setting up a seismic acquisition and observation system, belonging to the technical field of oil and gas seismic exploration. Background technique [0002] Artificial seismic methods play a pivotal role in oil and gas exploration, among which the field acquisition link is very important, which has a great impact on subsequent processing and interpretation, and will also affect the development and production of oil and gas. During the field acquisition process, the relative position relationship between the artificial shock source and the geophone is called the observation system, and its layout method is not only related to the quality of the acquisition signal of the target layer, but also related to the construction efficiency and progress. At present, my country's oil and gas exploration areas have shifted from simple areas to complex areas, such as the Ordos loess plateau area and southern carbonate rock outcro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01V1/20
Inventor 庄熙勤杜春江闫立志屈玉凤
Owner CHINA PETROLEUM & CHEM CORP
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