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Multi-direction seismic energy gradient difference carbonate karst cave type reservoir identification method

A seismic energy and reservoir identification technology, applied in the field of geophysical prospecting, can solve the problems of noise sensitivity and non-directionality

Active Publication Date: 2013-01-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The algorithm has high precision, but is non-directional and sensitive to noise

Method used

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  • Multi-direction seismic energy gradient difference carbonate karst cave type reservoir identification method
  • Multi-direction seismic energy gradient difference carbonate karst cave type reservoir identification method
  • Multi-direction seismic energy gradient difference carbonate karst cave type reservoir identification method

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Embodiment Construction

[0046] The purpose of the present invention is to provide a technology that uses computer technology to automatically realize the prediction and identification of carbonate cave-type reservoirs, and uses the multi-azimuth seismic energy gradient difference analysis method to describe the spatial position and morphological characteristics of carbonate caves .

[0047]The present invention first uses Hilbert transform to convert the post-stack seismic data into seismic energy data volume, selects two different azimuths according to the spatial characteristics of carbonate cave-type reservoirs, uses the least square method to estimate the gradient, and then calculates the different azimuths gradient difference.

[0048] The invention effectively utilizes the linear fitting method of the least square method to estimate the gradient of seismic energy from different azimuths, and then obtains the energy gradient difference at this point. Compared with other methods, this method has...

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Abstract

The invention discloses a multi-direction seismic energy gradient difference carbonate karst cave type reservoir identification method. The method comprises the following steps of: converting overlapped seismic data into a seismic energy data volume through Hilbert conversion; selecting two different directions according to the spatial characteristics of a carbonate karst cave type reservoir; performing gradient estimation by using a least square method; and calculating the gradient difference of different directions. The multi-direction seismic energy gradient difference carbonate karst cave type reservoir identification method has the advantages that a linear fitting method is stable, estimation radius can be randomly defined, the spatial position and shape of a carbonate karst cave can be accurately determined, the carbonate karst cave can be effectively identified, and the prediction accuracy and efficiency of the carbonate karst cave type reservoir can be remarkably improved.

Description

technical field [0001] The invention relates to geophysical prospecting technology, belongs to the field of petroleum and natural gas exploration and development, and relates to a multi-azimuth seismic energy gradient difference identification method for carbonate cave-type reservoirs. Background technique [0002] Carbonate reservoirs are of great strategic importance to world oil and gas production. According to statistics, more than 60% of oil production and 40% of natural gas production worldwide come from carbonate rock reservoirs. The comprehensive analysis of reservoir geology and development geology shows that carbonate reservoirs have characteristics different from conventional reservoirs, such as the dispersion of oil and gas distribution, the diversity of oil and gas properties, the stratification and heterogeneity of oil and gas accumulation, Instability of oil and gas production, etc. Among them, the strong heterogeneity of carbonate reservoirs is the most imp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01V1/30
Inventor 陈茂山詹仕凡万忠宏张红英
Owner BC P INC CHINA NAT PETROLEUM CORP
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