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Fractured reservoir parameter inversion method based on orientation elastic impedance difference

A technology of elastic impedance and azimuth difference, applied in seismic signal processing and other directions, can solve problems such as difficulty in meeting production requirements, unstable inversion results of anisotropic parameters, and difficulty in obtaining accurate and stable inversion results. Stable results

Inactive Publication Date: 2015-05-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The main problems in the inversion of anisotropic parameters based on azimuthal elastic impedance are: in the inversion of azimuthal elastic impedance, the anisotropic parameters and For the isotropic elastic parameters, because the anisotropic parameters have a weak influence on the azimuthal elastic impedance, and considering the influence of noise, etc., this will make the anisotropic parameter inversion results extremely unstable when inverting these parameters at the same time, and there are large uncertainty
[0005] The existing technology generally does not take into account the contribution of anisotropy parameters to actual seismic data. Therefore, it is often difficult to obtain accurate, Stable inversion results are difficult to meet the current actual production needs

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  • Fractured reservoir parameter inversion method based on orientation elastic impedance difference
  • Fractured reservoir parameter inversion method based on orientation elastic impedance difference
  • Fractured reservoir parameter inversion method based on orientation elastic impedance difference

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[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] In the prior art, the disadvantages specifically have the following two points: First, the pre-stack azimuth elastic impedance inversion is highly dependent on the prior information of the main symmetry axis of the reservoir. When obtained accurately, there will be a certain deviation between the inversion results and the actual parameters of the reservoir; second, in the pre-stack azimuth elastic impedance inversion, usually the anisotropic elastic impe...

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Abstract

The invention provides a fractured reservoir parameter inversion method based on orientation elastic impedance difference. The method removes effects of isotropic parameters on orientation anisotropic elasticity impedance, further extracts orientation difference caused by the isotropic parameters, and solves the problem in the prior art of inaccurate inversion caused by narrow difference negligence caused by the fact that orientation elasticity impedance change caused by the anisotropic parameters is small when the isotropic parameters and the anisotropic parameters are inverted simultaneously. Orientation difference is amplified simultaneously, the inversion stability is improved while inversion accuracy of the anisotropic parameters is not affected, and the method provides reliable guarantee for recognition of fractured reservoir fluid recognition.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration of unconventional oil and gas resources, and more specifically, relates to a fracture reservoir parameter inversion method based on azimuth elastic impedance difference. Background technique [0002] With the gradual development of oil and gas exploration to unconventional oil and gas resources, azimuthal anisotropic oil and gas reservoirs such as fractured oil and gas reservoirs have become the key targets of oil and gas geophysical exploration. The development of fractures in reservoirs is very common. After undergoing complex structural development and long diagenetic evolution, fractures have become an important feature of reservoirs. The potential of oil and gas resources in fractured reservoirs in my country is huge, and great achievements have been made in oil and gas exploration and development. With the continuous improvement of oil and gas exploration accuracy, the requi...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 宗兆云印兴耀罗辑
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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