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Three-dimensional method for determining structure of underground oil-gas reservoir

A technology for oil and gas reservoirs and structures, applied in the field of petroleum exploration and development, can solve the problems of inability to achieve complete wave field decomposition and reconstruction, and achieve the effects of high efficiency, low frequency dispersion, and high processing accuracy

Active Publication Date: 2009-12-09
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0008] Patent application CN101173988 discloses an elastic wave field reconstruction method that realizes the separation of longitudinal and transverse waves under a two-dimensional first-order staggered grid, but cannot realize the decomposition and reconstruction of a complete wave field under the condition of a three-dimensional first-order staggered grid

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  • Three-dimensional method for determining structure of underground oil-gas reservoir
  • Three-dimensional method for determining structure of underground oil-gas reservoir
  • Three-dimensional method for determining structure of underground oil-gas reservoir

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Embodiment Construction

[0031] The present invention proposes a three-dimensional longitudinal and transverse wave decomposition wave field reconstruction formula (as shown in (1) formula) under the first-order staggered grid, by solving the (1) formula, the record v of pure longitudinal wave can be obtained p =v xp +v yp +v zp and records of pure shear waves v s =v xs +v ys +v zs . In the process of wave field reconstruction, the staggered grid method is used to solve the problem, that is, the six displacement velocities (v xp , v xs , v yp , v ys , v zp , v zs ) with respect to the time partial derivative equation, the stress field is used in the solution; then the six stresses (τ xx , τ yy , τ zz , τ xy , τ xz , τ yz ) with respect to the time partial derivative equation, the displacement velocity field is used in the solution. The two-step solution process is interdependent.

[0032] The obtained pure wave record contains converted wave, which is different from the pure wave re...

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Abstract

The invention relates to a three-dimensional method for determining the structure of an underground oil-gas reservoir. The method comprises the following concrete steps: obtaining a velocity field and a density field of transverse waves and longitudinal waves conforming to underground geologic structure by processing; carrying out linear encryption interpolation on a dispersion field renewedly according to observation system parameters and the dispersion field so as to adapt the requirement for rebuilding a wave field; rebuilding wave field values on each net point at each moment on the basis of the dispersion field; outputting a pure P wave field and a pure S wave field at a position where a demodulator probe is located at each moment to be used as a wave field rebuilding record of the moment; and comparing stacking and excursion sections obtained from wave field rebuilding and stacking and excursion sections obtained by processing field collected data to determine the configuration and the position of the structure of the underground oil-gas reservoir. In the invention, the recoded longitudinal wave and the recorded transverse wave obtained from wave field rebuilding are completely separated so that the separation of the longitudinal wave field and the transverse wave field is not needed in the subsequent wave field research.

Description

technical field [0001] The present invention relates to petroleum exploration and development technology, specifically a definite subterranean method of p-wave and s-wave decomposition realized under staggered grids, which has high wave field reconstruction accuracy, high reconstruction efficiency and low dispersion, and can be popularized and used on a large scale. A 3D approach to reservoir tectonics. Background technique [0002] In reflection wave seismic exploration, the reflection information (such as seismic records) from underground geological bodies is obtained by using a seismic source (explosive source, vibrator or heavy hammer source) on the ground to excite. For the obtained reflection information, it is necessary to pass A series of seismic data processing (including static correction, dynamic correction, stacking and migration, etc.) to obtain imaging sections (including stacking sections and migration sections) and velocity fields (including stacking velocity...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 张建磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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