Method and equipment for predicting tight gas layers based on frequency-variable reflection amplitude attenuation

A reflection amplitude, compact technology, applied in the field of seismic oil and gas exploration, to achieve the effect of accurate identification

Inactive Publication Date: 2021-04-23
CHINA UNIV OF PETROLEUM (BEIJING) +1
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Problems solved by technology

[0004] However, in addition to travel time information, seismic data also contain other useful information, such as seismic wave propagation energy attenuation and relaxation mechanism; and because idealized rheological models are difficult to apply to inversion techniques, frequency-dependent AVO is difficult It is difficult to accurately and effectively identify tight gas layers

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  • Method and equipment for predicting tight gas layers based on frequency-variable reflection amplitude attenuation
  • Method and equipment for predicting tight gas layers based on frequency-variable reflection amplitude attenuation
  • Method and equipment for predicting tight gas layers based on frequency-variable reflection amplitude attenuation

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[0091] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0092] figure 1 It is a schematic flowchart of a method for predicting tight gas layers based on frequency-varying reflection amplitude attenuation provided by an embodiment of the present invention. The execution subject of this embodiment may be a server or a computer terminal. The method includes:

[0093] Step A: Analyze the range and chara...

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Abstract

An embodiment of the present invention provides a method and equipment for predicting tight gas layers based on frequency-variable reflection amplitude attenuation. The method includes: analyzing the range and characteristic frequency of oil and gas reservoir attenuation with frequency; determining caprock, oil and gas reservoirs, and water layers Poroelastic parameters; forward simulation of the attenuation characteristics of the reflection amplitude of oil and gas reservoirs or water layers under different frequency conditions with offset or incident angle; calculate the pre-stack time-frequency data volume in the effective frequency range; determine the oil and gas reservoir amplitude The frequency-varying offset range; according to the offset or incident angle determined by the intersection map, combined with the forward modeling results of the frequency-varying reflection amplitude, the pre-stack reflection amplitude attribute parameter AMO is calculated; according to the low-frequency and high-frequency attenuation attribute parameter AAI , calculate the frequency-dependent pre-stack reflection amplitude attenuation index parameter FDAAI, determine the FDAAI profile, and identify the location of oil and gas reservoirs, which can accurately identify tight gas reservoirs.

Description

technical field [0001] Embodiments of the present invention relate to the field of seismic oil and gas exploration, in particular to a method and equipment for predicting tight gas layers based on frequency-variable reflection amplitude attenuation. Background technique [0002] As a widely used technique, AVO (Amplitude Variation with Offset) can also be used for the analysis of pore fluid attenuation. In the 1960s, Bortfeld proposed the AVO analysis technique. Since then, many experts and scholars have conducted research on this theory, gradually making it an important technique for studying reservoir properties. [0003] Obtaining rock characteristics from seismic data is a challenging task that needs to be described by accurate constitutive equations (mathematical models reflecting the macroscopic properties of matter). Current frequency-dependent AVO processing and inversion algorithms use simplified rheological models and are mainly based on travel-time information to...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/40
CPCG01V1/282G01V1/301G01V1/306G01V1/307G01V1/40
Inventor 李生杰康永尚赵群王红岩时辰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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