Velocity change along with frequency information-based oil-gas detection method

A technology of frequency change and oil and gas detection, which is applied in the field of petroleum geophysical exploration, can solve the problems of poor detection of oil content in reservoirs, multi-solution and uncertainty of oil and gas detection results, so as to improve sensitivity and reliability, The effect of reducing uncertainty and improving accuracy

Inactive Publication Date: 2010-06-16
北京北方林泰石油科技有限公司 +1
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Problems solved by technology

[0009] There are two defects in the current seismic attribute hydrocarbon detection technology: first, the commonly used oil and gas detection methods and technologies are strictly based on the theory of single-phase media, while oil and gas reservoirs are multi-phase media. The oil and gas detection results have multiple solu

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  • Velocity change along with frequency information-based oil-gas detection method
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  • Velocity change along with frequency information-based oil-gas detection method

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Embodiment Construction

[0038] Starting from post-stack seismic gathers, the present invention first uses mathematical transformation for time-frequency analysis on each seismic trace signal of the target layer; then extracts the group characteristic parameter gathers of each seismic trace signal from the time-frequency spectrogram; The group energy gradient attribute (GVF) is extracted from the parameter gather for oil and gas identification. This method greatly improves the sensitivity and reliability of oil and gas layer identification, reduces the uncertainty of conventional methods, and significantly improves the ability to distinguish oil and gas from water.

[0039] Concrete steps of the present invention include:

[0040] Specific steps include:

[0041] (1) For the seismic record data excited and received in the work area, perform high-fidelity processing with relative amplitude preservation and frequency fidelity according to conventional seismic data processing, and form a post-stack gath...

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Abstract

The invention relates to the technology of geophysical exploration for oil, in particular to a velocity change along with frequency information-based oil-gas detection method. The velocity change along with frequency information-based oil-gas detection method starts from a post-stack seismic channel set, and comprises the following steps: firstly, adopting mathematical transformation to perform time-frequency analysis on each seismic channel signal of a target formation; then, extracting a group character parameter set of each seismic channel signal from a temporal frequency spectrum; and finally, extracting a group energy gradient attribute (GVF) from the group character parameter set to perform the oil-gas recognition. The velocity change along with frequency information-based oil-gas detection method improves the sensitivity and the reliability of the oil-gas recognition, reduces the uncertainty in conventional methods, obviously improves the capacity of separating the oil gas and water, and has high accuracy rate of recognizing oil-bearing reservoirs.

Description

technical field [0001] The invention belongs to petroleum geophysics exploration technology, and is an oil and gas detection method based on the information of the change of velocity with frequency. Background technique [0002] In petroleum geophysical exploration hydrocarbon detection technology, in addition to the commonly used "bright spot" technology, "AVO" technology, seismic wave absorption and attenuation technology, and spectral decomposition technology for oil and gas detection using seismic data, the research on the velocity dispersion characteristics of seismic waves is becoming more and more important. are getting more and more attention. [0003] Actual oil and gas reservoirs are composed of solid parts containing pores or fractures and fluids (including oil, gas, water, etc.) in pores or fractures, which belong to two-phase or multiphase media. Biot's theory (Biot, M.A., 1956) describes the propagation of elastic waves in saturated fluid porous media (or two-...

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Application Information

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IPC IPC(8): G01V1/48
Inventor 裴正林甘利灯
Owner 北京北方林泰石油科技有限公司
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