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Method for confirming underground oil-gas reservoir construction

A technology of oil and gas reservoirs and structures, applied in the direction of seismic signal processing, etc., can solve problems such as unsuitable for large-scale promotion and use, low reconstruction efficiency, numerical dispersion, etc.

Active Publication Date: 2008-05-07
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

[0007] In 2003, Ma Detang proposed the elastic wave field reconstruction using the second-order partial derivative elastic wave equation to realize the separation of longitudinal and transverse waves. However, this method has low reconstruction efficiency and serious numerical dispersion, which is not suitable for large-scale promotion and use.

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  • Method for confirming underground oil-gas reservoir construction
  • Method for confirming underground oil-gas reservoir construction
  • Method for confirming underground oil-gas reservoir construction

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Embodiment Construction

[0029] The two-dimensional longitudinal and transverse wave decomposition wave field reconstruction formula (as shown in (1) formula) of the present invention under the first-order staggered grid, by solving the (1) formula, we can obtain the record v of the pure longitudinal wave p =v xp +v zp and records of pure shear waves v s =v xs +v zs . In the process of wave field reconstruction, the staggered grid method is used to solve the problem, that is, the four displacement velocities (v xp , v xs , v zp , v zs ) with respect to the time partial derivative equation, the stress field is used in the solution; then the three stresses (τ xx , τ zz , τ xz ) with respect to the time partial derivative equation, the displacement velocity field is used in the solution. The two-step solution process is interdependent.

[0030] The obtained pure wave records contain converted waves, which are different from the pure wave records (without converted wave components) reconstruct...

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Abstract

The invention relates to a reconstruction method of p and s-wave disintegration elastic wave used for oil exploration, comprising the following procedures: first, determining reconstruction parameters during wave field reconstruction according to actual parameters acquired by a observation system; second, reading a velocity field and a density field of lengthwise and transverse wave layers which is in conformity with the local underground geological structure and is acquired through seismic data in the early phase; third, performing interpolation for a disintegration field again according to the parameters of the observation system and the disintegration field; fourth, performing the acquired wave field reconstruction record processing identical to the actual data to acquire a corresponding profile; fifth, comparing a reconstruction profile and a data collection profile to determine oil gas reservoir structure. The invention has the advantages of effective wave field reconstruction under two-dimensional condition, applicability to wave field reconstruction of any complex structure, ability to determine underground oil gas reservoir structure, high precision and efficiency and low frequency dispersion.

Description

technical field [0001] The present invention relates to the reconstruction of the wave field and the method for determining the structure of underground oil and gas reservoirs in petroleum exploration and development. Specifically, it is a method with high wave field reconstruction accuracy, high reconstruction efficiency and low dispersion, which can be realized under the staggered grid. Large-scale promotion of elastic wave reconstruction of p-wave and s-wave decomposition and methods for determining the structure of underground oil and gas reservoirs. Background technique [0002] In reflection wave seismic exploration, we obtain reflection information (such as seismic records) from underground geological bodies by using seismic sources (dynamite sources, vibrators or heavy hammer sources) on the ground to excite. For the obtained reflection information, we need Through a series of seismic data processing (including static correction, dynamic correction, stacking and migr...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 张建磊田振平
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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