VSP observation system design method facing objective layer

A technology of observation system and design method, which can be used in measurement devices, geophysical measurements, instruments, etc., and can solve problems such as uneven meta-attributes at the target level

Inactive Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, some software has increased the evaluation of the observation system design of the undulating surface and complex structure, but there is still no solution
Therefore, so far, no one has proposed to solve the problem of uneven meta-attributes at the target layer caused by undulating surface and complex structure.

Method used

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  • VSP observation system design method facing objective layer
  • VSP observation system design method facing objective layer
  • VSP observation system design method facing objective layer

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0029] The present invention aims at the characteristics that the receiving arrangement is relatively fixed in VSP acquisition, uses the reverse ray tracing algorithm to obtain the ideal shot point position passing through the center of the CRP bin center of the target layer, and designs the shot point arrangement on the basis of the shot point distribution density plan, thereby The attributes of the CRP surface elements of the destination layer are optimized, and the uniformity of the CRP surface element attributes is enhanced. The method can be installed and used on an ordinary microcomputer, occupies less computer resources, has a small amount of calculation, and is simple and practical.

[0030] The impact of complex structures on VSP observations is as follows: figure 1 As shown, R1 and R2 are the receiving points of the geophone in the borehole. When the target...

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Abstract

The invention provides a VSP observation system design method facing an objective layer, belonging to the field of seismic data collection. The method comprises the steps of determining the laying depth and distance of a geophone according to an exploration task and objective layer depth, (2) collecting the existing data of a work area and establishing a mathematical model, (3) carrying out reverse ray tracing calculation to obtain an ideal shot point position density distribution graph according to the attributes which comprise superposition times, azimuthal uniformity and offset of the CRP surface element required by the exploration task, (4) determining shot point arrangement mode and shot point density according to the ideal shot point position density distribution graph, and (5) carrying out ray tracking calculation according to the determined shot point arrangement mode and shot point density in step (4) and the determined laying depth and distance of the geophone in step (1) and obtaining the superposition times statistics and azimuth statistics based on CRP.

Description

technical field [0001] The invention belongs to the field of seismic data acquisition, and in particular relates to a design method of a target layer-oriented VSP observation system. Background technique [0002] Observation system design is the construction basis for VSP field seismic data acquisition. But for a long time, due to technical limitations, the conventional observation system design assumes a horizontal surface and a horizontal medium. With the continuous deepening of exploration, there are fewer and fewer exploration work areas with flat surface and horizontal target layer, and more and more large undulating surface and complex structure of target layer. The method that has been used in the field of observation system design is still the design method of horizontal surface and horizontal medium. In recent years, some software has increased the evaluation of observation system design for undulating surface and complex structures, but no solution has been propo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01V1/22
Inventor 王龙泉
Owner CHINA PETROLEUM & CHEM CORP
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