Method and system for analyzing elastic wave attenuation attributes of tight sandstone

A tight sandstone and elastic wave technology, applied in the field of analysis of elastic wave attenuation properties of tight sandstone, can solve problems such as difficult operation, difficult control of laboratory test accuracy, and result errors

Pending Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual process of obtaining the attenuation attribute, there are great difficulties, such as the difficulty of controlling the accuracy

Method used

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  • Method and system for analyzing elastic wave attenuation attributes of tight sandstone
  • Method and system for analyzing elastic wave attenuation attributes of tight sandstone
  • Method and system for analyzing elastic wave attenuation attributes of tight sandstone

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Embodiment Construction

[0073] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0074] The attenuation properties of the rock are more sensitive to the fluid and porosity in the rock than other elastic parameters, so the determination of the attenuation properties is also very important. However, it is very difficult to obtain the actual attenuation properties. Usually, the laboratory spectrum ratio method is used. According to the test method, due to the high requirements for the test process and instruments, it is difficult to control the attenuation accuracy obtained by the test, and the test is difficult. Therefore, the present invention adopts the combination of laboratory ultrasonic velocity-pressure test and theory to obtain the attenuation properties of tight sandstone, and provides a more reliable support method for studying physical properties such as rock fluids.

[0075] The invention constructs a method and system suitable for analyz...

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Abstract

The invention provides a method and system for analyzing elastic wave attenuation attributes of tight sandstone, and belongs to the field of rock physics. The method comprises the following steps: (1) inputting dry rock core test data; (2) determining the hard porosity and the pore aspect ratio of hard pores of the rock by utilizing dry rock core test data; (3) determining the soft porosity and pore aspect ratio distribution of soft pores of the rock by utilizing dry rock core test data; and (4) obtaining a longitudinal wave attenuation attribute and a transverse wave attenuation attribute of the rock by utilizing the hard porosity, the pore aspect ratio and the distribution of the soft porosity and the pore aspect ratio. By means of the method, the sensitivity of the rock attenuation attributes to pores and pore fluid can be analyzed in rock physical reservoir prediction, the attenuation attributes under different frequencies are accurately obtained, and therefore, the attenuation attributes corresponding to rocks in well logging, earthquake and ultrasonic frequency bands can be provided at the same time.

Description

technical field [0001] The invention belongs to the field of rock physics, and in particular relates to a method and system for analyzing elastic wave attenuation properties of tight sandstone. Background technique [0002] Seismic rock physics methods play an important technical support role in the exploration and development of unconventional oil and gas reservoirs, and can effectively describe the complex pore structure, physical properties and fluid-bearing properties of reservoirs. Physical properties, pore structure, and fluid are three important factors in the process of reservoir prediction and description, and the attenuation properties of reservoir rocks are more sensitive to the pores and fluids contained in rocks than other rock elastic parameters. Exploring attenuation The connection between properties and petrophysical properties is one of the important aspects in exploration, and petrophysical analysis methods are an effective way to establish the relationship...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 王欢张卫华刘卫华白俊雨沈珲
Owner CHINA PETROLEUM & CHEM CORP
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