Design method of converted wave-highlighted VSP observation system

A technology of observation system and design method, applied in the field of seismic exploration, can solve problems such as difficulty, weak PSV wave energy, and inability to complete exploration tasks.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Therefore, in the actual three-dimensional three-component VSP data acquisition, it is extremely difficult to use the same observation system scheme to complete the field data acquisiti...

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  • Design method of converted wave-highlighted VSP observation system
  • Design method of converted wave-highlighted VSP observation system
  • Design method of converted wave-highlighted VSP observation system

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0040] According to the different propagation laws of P wave and PSV wave, the method of the present invention proposes a set of 3D VSP observation system design method based on the target layer, which solves the ubiquitous PSV wave energy weak and insufficient information in 3D three-component exploration. The problem lays the foundation for better use of PSV waves for fluid identification, fracture judgment and other depth data interpretation.

[0041] Such as Picture 11 As shown, the design process and implementation steps of the present invention are as follows:

[0042] 1. According to the physical parameters of the exploration target layer (the density of the medium above and below the target layer and the velocity of the vertical and horizontal waves), solve the Zoeppritz equation to obtain the relationship between the P wave reflection coefficient and the P...

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Abstract

The invention provides a design method of a converted wave-highlighted VSP observation system, and belongs to the field of seismic exploration in the petroleum industry. The design method comprises the following steps: (1) according to physical parameters of an exploration target layer, solving a Zoeppritz equation to obtain relationships between a P wave reflecting coefficient and a PSV wave reflecting coefficient of the target layer and incident angles; according to change rules of the reflecting coefficients, determining the effective incident angle theta P1-theta P2 of the P wave and the effective incident angle theta S1-theta S2 of the PSV wave of the target layer; (2) according to conditions of an exploration task and a VSP acquisition device, determining arrangement depths the of wave detectors in a well and intervals between the wave detectors; (3) for each CCP surface element, tracing and calculating a ray in a PSV wave receiving point-CCP-shot point direction according to the superposition times required by the task, and calculating a shot point position at which the incident angle is within the effective incident angle theta S1-theta S2 of the PSV wave to generate a density figure at the shot point position of the PSV wave.

Description

Technical field [0001] The invention belongs to the field of seismic exploration in the petroleum industry, and specifically relates to a design method of a VSP observation system that highlights converted waves. Background technique [0002] Three-dimensional three-component seismic exploration, because it provides more abundant information than conventional P-wave exploration, has attracted much attention in recent years. Because P waves and PSV waves have different propagation laws, how to design an observation system that takes both P waves and PSV waves into consideration has always been a difficult problem to solve. In three-dimensional VSP exploration, construction volume and cost control are factors that must be considered when designing an observation system. It is usually required to complete the reception and acquisition of P waves and PSV waves (the converted waves refer to PSV waves) in one operation. The conventional VSP observation system design is first designed ...

Claims

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Application Information

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IPC IPC(8): G01V1/00G01V1/20
Inventor 王龙泉
Owner CHINA PETROLEUM & CHEM CORP
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