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Amplitude orientation derivative-based reservoir fracture distribution characteristic determination method and system

A technology of distribution characteristics and determination method, applied in the field of petroleum exploration, can solve problems such as fracture density deviation and large error in predicting fractures

Pending Publication Date: 2021-07-06
PETROCHINA CO LTD
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Problems solved by technology

Xiao Pengfei [21] studied the influence of dip angle on fracture density inversion. When the fracture dip angle is less than 80°, the fracture density predicted by ellipse fitting has a large deviation.
Moreover, the azimuth reflection amplitude is not all ellipses in polar coordinates, and may also be in the shape of a "peanut". At this time, the error of ellipse fitting in predicting cracks is relatively large

Method used

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  • Amplitude orientation derivative-based reservoir fracture distribution characteristic determination method and system
  • Amplitude orientation derivative-based reservoir fracture distribution characteristic determination method and system
  • Amplitude orientation derivative-based reservoir fracture distribution characteristic determination method and system

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Embodiment Construction

[0062] 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.

[0063] According to one aspect of the present invention, this embodiment discloses a method for determining distribution characteristics of reservoir fractures based on amplitude and azimuth derivatives. like figure 1 As shown, in this embodiment, the method includes:

[0064] S100: Obtaining the amplitude and azimuthal derivatives of the events of the reservoir fracture target layer according to the three-dimensional seismic data.

[0065] S200: Construct a...

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Abstract

The invention provides an amplitude orientation derivative-based reservoir fracture distribution characteristic determination method and system. The method comprises the following steps: obtaining the amplitude orientation derivative of a reservoir fracture target stratum event according to three-dimensional seismic data; according to the amplitude orientation derivative, constructing an inversion model and obtaining a quasi-anisotropy parameter, and converting the quasi-anisotropy parameter into a reservoir fracture parameter; and extracting the slice along the layer and the section of the reservoir fracture parameter to analyze the reservoir fracture distribution characteristic. The method can improve the prediction precision of the reservoir fracture distribution characteristic.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and system for determining distribution characteristics of reservoir fractures based on amplitude and azimuth derivatives. Background technique [0002] The production of fractured oil and gas reservoirs accounts for more than half of the world's total oil and gas production. In domestic oil and gas exploration, fractured reservoirs are an important exploration field. For example, fractured reservoirs in Ordovician carbonate rocks in the Tarim Basin, Fractured tight sandstone reservoirs in Sichuan. Fractures are not only migration channels for underground fluids such as oil, gas, and water, but also storage spaces for fluids. Fractures can greatly increase the permeability of reservoirs. Fractured reservoir characterization includes predicting fracture distribution characteristics and detecting fracture fillings, that is, detecting effective fractures that...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/301G01V1/306
Inventor 谢春辉杨午阳雍学善王恩利杨庆赵万金闫国亮张军舵何润鄢高韩李琳
Owner PETROCHINA CO LTD
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