Underground non-uniform medium seismic investigation complexity quantitative evaluating method

A non-homogeneous medium, quantitative evaluation technology, applied in the field of oil exploration, can solve problems such as lack of, no breakthrough, uncertainty of physical relationship, etc.

Inactive Publication Date: 2008-10-01
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Due to the lack of effective theories and methods, coupled with the uncertainty of the physical relationship between reservoir physical parameters or between parameters

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  • Underground non-uniform medium seismic investigation complexity quantitative evaluating method
  • Underground non-uniform medium seismic investigation complexity quantitative evaluating method
  • Underground non-uniform medium seismic investigation complexity quantitative evaluating method

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Embodiment Construction

[0023] The present invention will be further described below with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] The invention quantitatively expresses heterogeneity changes of complex geological structures and complex oil and gas reservoirs from the geological point of view, and quantitatively describes the detection ability of seismic waves from the point of view of wave equations. Through the combination of the two research results, a method for quantitatively analyzing the complexity of seismic detection in subsurface heterogeneous media is proposed, which lays a foundation for seismic imaging of underground complex structures and lateral prediction risk assessment of oil and gas reservoirs.

[0025] The steps to calculate the heterogeneous spectrum of lateral velocity variation of the medium and the heterogeneous spectrum method of formation angle variation include: 1) A rough subsurface seismic velocity field estimate v(r) can be ...

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Abstract

The present invention discloses a method for quantitative-evaluating the detection complexity of the underground inhomogeneous medium earthquake. At first the inhomogeneous spectrum of transverse velocity variation of complex structure medium and the inhomogeneous spectrum of the stratum angle variation are calculated. Afterwards, the frequency dispersion relationship of various wave equation seismic transmission operator and the broadband characteristic thereof are analyzed and calculated. Then the frequency dispersion relationship and the broadband characteristic of the seismic transmission operator are correlated with the transverse velocity variation of the complex structure medium and the inhomogeneous spectrum of stratum angle variation. The transmission efficiency of seismic wave in complex medium are calculated through establishing a dot product to the inhomogeneous spectrum and angular spectrum of the seismic transmission operator with the transverse velocity variation of complex structure medium and the inhomogeneous spectrum of the stratum angle variation. Finally the complexity coefficient eta of underground medium variation and seismic detection is defined thereby defining a complexity coefficient phi=1-eta of the underground medium variation. The quantitative evaluation to the complexity of complex medium is realized.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and relates to a quantitative assessment in complex structural imaging, oil and gas reservoir prediction and reservoir comprehensive evaluation risk assessment technologies. Background technique [0002] The quantification of the complexity of subsurface media has long been a research technique of concern to the scientific community. Comprehensive evaluation of risk assessment, etc. will have a profound impact. [0003] The impact of geological heterogeneity on seismic imaging is so obvious that the effect of imaging algorithms is often a compromise between geological complexity, imaging accuracy requirements, and computing speed. Complex geological structures such as salt domes, steep fault zones and formations, and nappe replacements have strong lateral velocity changes and formation dip angle changes, which directly affect the effect of seismic migration imaging. The complexity of the un...

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Application Information

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IPC IPC(8): G01V1/40G01V1/50
Inventor 符力耘
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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