Fluid detection method based on shear wave splitting amplitude difference attribute

A technology of shear wave splitting and fluid detection, which is applied in the field of seismic exploration, can solve the problems of insensitivity of fluid detection and short propagation time, and achieve good applicability

Inactive Publication Date: 2018-02-09
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a fluid detection method based on the attribute of shear wave splitting amplitude difference to solve the problem of fluid detection due to the short propagation time and anisotropy of shear wave splitting velocity in fractured thin reservoirs in which there are fast and slow shear waves in the prior art. insensitive question

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  • Fluid detection method based on shear wave splitting amplitude difference attribute
  • Fluid detection method based on shear wave splitting amplitude difference attribute
  • Fluid detection method based on shear wave splitting amplitude difference attribute

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[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] figure 1 is a flowchart of a fluid detection method based on the shear wave splitting amplitude difference attribute according to an embodiment of the present invention.

[0022] In step S102, a three-dimensional viscoelastic HTI model is used to model the thin reservoir and perform forward modeling. In this embodiment, the 3D viscoelastic HTI model is used to model thin reservoirs, simplifies the real geological structure, and only includes several important factors that affect the seismic section, such as formation velocity, density, thickness, and spatial shape of the interface.

[0023] And, further speaking, step S102 includes step S202, step S204, step S206, step S208 and step S210, such as figure 2 shown. In step S202, a...

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Abstract

The invention discloses a fluid detection method based on shear wave splitting amplitude difference attribute, which includes the following steps: modeling a 3D viscoelastic HTI model thin reservoir,and carrying out forward modeling; based on data of forward modeling, analyzing the amplitude attributes of the fast and slow shear waves of the data; determining the fluid threshold of the amplitudedifference between the fast and slow shear waves through logging data intersection analysis; obtaining a fast and slow shear wave amplitude difference profile according to the amplitude attribute analysis and the fluid threshold; and detecting fluid according to the amplitude attribute analysis and the fast and slow shear wave amplitude difference profile. Through the method of the invention, theproblem that the splitting velocity anisotropy of fast and slow shear waves in a fractured thin reservoir is not sensitive to fluid detection due to short propagation time is solved.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a fluid detection method based on the amplitude difference attribute of shear wave splitting. Background technique [0002] Fluid detection technology in fractured thin reservoirs is an important subject, and the method for evaluating fluid saturation in fractured reservoirs is shear wave splitting (SWS). When a shear wave propagates into a fractured layer, it splits into two pure shear waves, the fast S1 wave parallel to the fracture and the slow S2 wave perpendicular to the fracture. The time delay of the two orthogonal shear waves gives a way to reveal information about the reservoir. According to the thin round coin model, the shear wave splitting phenomenon of fractured rocks was observed in the experimental synthetic sandstone samples, and the results show that shear wave splitting is a reliable parameter in oil and gas reservoir exploration. However, the shear...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 杨春颖王赟袁慎志
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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