Method and apparatus for predicting tight gas layer based on frequency-variable reflection amplitude attenuation

A reflection amplitude, compact technology, applied in the field of seismic oil and gas exploration

Inactive Publication Date: 2020-05-08
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 be

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  • Method and apparatus for predicting tight gas layer based on frequency-variable reflection amplitude attenuation
  • Method and apparatus for predicting tight gas layer based on frequency-variable reflection amplitude attenuation
  • Method and apparatus for predicting tight gas layer based on frequency-variable reflection amplitude attenuation

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Embodiment Construction

[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

The embodiment of the invention provides a method and apparatus for predicting a tight gas layer based on frequency-variable reflection amplitude attenuation. The method comprises the following steps:analyzing the range and characteristic frequency of oil and gas reservoir attenuation along with frequency changes; determining pore elastic parameters of a cover layer, an oil and gas reservoir anda water layer; forward modeling attenuation characteristics of the reflection amplitude of the oil and gas reservoir or the water layer along with the offset or the incident angle under different frequency conditions; performing calculation to obtain a pre-stack time-frequency data volume in an effective frequency range; determining an offset range in which the amplitude frequency change of the oil and gas reservoir changes drastically; calculating a pre-stack reflection amplitude attribute parameter AMO according to the offset distance or incident angle determined by a cross plot in combination with a frequency-varying reflection amplitude forward modeling result; and according to a low-frequency attenuation attribute parameter AAI and a high-frequency attenuation attribute parameter AAI,calculating a pre-stack reflection amplitude attenuation index parameter FDAAI depending on frequency changes, determining an FDAAI profile, and carrying out position identification on the oil and gas reservoir, so that the tight gas reservoir can be accurately identified.

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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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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