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Reservoir fluid identification method based on pore fluid parameter frequency dependence inversion

A technology for pore fluid and fluid identification, applied in the field of geophysical exploration data processing, which can solve the problems of lack of stability of least squares inversion method

Inactive Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The frequency response characteristics of different elastic parameters are also different, and the velocity dispersion attribute is not the most sensitive fluid factor to reservoir fluid, and the least squares inversion method lacks stability

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  • Reservoir fluid identification method based on pore fluid parameter frequency dependence inversion
  • Reservoir fluid identification method based on pore fluid parameter frequency dependence inversion
  • Reservoir fluid identification method based on pore fluid parameter frequency dependence inversion

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Embodiment Construction

[0047] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] Such as Figure 9 As shown, the reservoir fluid identification method based on frequency-varying inversion of pore fluid parameters is mainly divided into the following steps:

[0049] (1) Transform the pre-stack CMP gather data into pre-stack CRP gather data, and then extract at least three partial angle stack data according to the pre-stack CRP gather;

[0050] (2) Combining the angle partial stacking data and the multi-scale decomposition method of seismic data, the seismic data of each angle are converted into seismic data of 5 different main frequencies;

[0051] (3) Combined with seismic data of different frequencies and different angles and the inversion method of Bayesian theory, the frequency-dependent properties of pore fluid parameters can be inverted;

[0052] (4) The high value of the frequency-v...

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Abstract

A reservoir fluid identification method based on pore fluid parameter frequency dependence inversion is disclosed. The method comprises the following steps of carrying out amplitude preservation, denoising and offset processing on pre-stack seismic data; carrying out different-angle stack to acquire different-angle-stack seismic data of at least three angles; establishing a pore fluid parameter and a shear modulus model, extracting an angle wavelet and carrying out wavelet multi-scale frequency division processing on the different angle stack seismic data; carrying out frequency dependence attribute inversion of the pore fluid parameter; and according to a pore fluid parameter frequency dependence attribute evolution value, determining a reservoir fluid development situation. By using the method, received seismic information is used and a deceptive problem in conventional fluid identification can be well solved; a sensibility of a dependence inversion attribute of a pore-fluid sensitive parameter to a reservoir fluid is high and identification precision to the fluid is high; an Bayesian inversion theory is used to carry out inversion so that stability and reliability are high.

Description

technical field [0001] The invention is used in the field of geophysical exploration data processing methods, in particular a method for identifying fluids in various rock reservoirs such as sandstone, mud shale, carbonate rock and igneous rock by using the dispersion property of pore fluid parameters. Background technique [0002] Obtaining high-precision reservoir fluid identification results is the ultimate goal of geophysical exploration. With the deepening of exploration, the underground conditions we face become increasingly complex. Reservoir fluid identification based on seismic data can increase the success rate of exploration to a certain extent, improve production efficiency and reduce exploration and development costs. It is one of the research hotspots in the stage of oil and gas exploration. [0003] The reflected seismic waves received in geophysical exploration are the comprehensive response of underground formations, reflecting the development of physical p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 冯德永魏文李红梅印兴耀王兴谋刘海宁王树刚吴国忱胡贤根王红
Owner CHINA PETROLEUM & CHEM CORP
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