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Crack effectiveness evaluation method based on imaging logging and array acoustic logging information

A technology for array acoustic logging and imaging logging, applied in the field of geophysical logging, can solve problems such as low resolution, and achieve the effect of improving accuracy and reliability

Pending Publication Date: 2021-05-25
YANGTZE UNIVERSITY +3
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Problems solved by technology

However, the resolution of array acoustic logging fracture evaluation method is lower than that of imaging logging

Method used

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  • Crack effectiveness evaluation method based on imaging logging and array acoustic logging information
  • Crack effectiveness evaluation method based on imaging logging and array acoustic logging information
  • Crack effectiveness evaluation method based on imaging logging and array acoustic logging information

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Embodiment Construction

[0049] see figure 1 , taking the evaluation of the water-based mud well in the X area as an example to further explain the method of the present invention:

[0050] 1. Acquisition of eigenvalue curves of various logging fracture attribute parameters:

[0051] 1) Using imaging logging data of known wells to quantitatively evaluate fracture parameters, including fracture width, density, length and surface porosity:

[0052] The calculation (quantitative evaluation) of imaging logging fracture parameters is mainly realized through logging data processing software, including but not limited to fracture density, fracture width, fracture length, fracture surface porosity, fracture dip angle, fracture tendency, fracture direction and other parameters. It should be noted that for water-based mud wells, micro-resistivity imaging logging data is preferred to calculate the above fracture attribute parameters; for oil-based mud wells, ultrasonic imaging logging data is preferred for calc...

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Abstract

The invention discloses a crack effectiveness evaluation method based on imaging logging and array acoustic logging information, and the method comprises the steps: obtaining a plurality of crack attribute parameter curves through the evaluation of the imaging logging information and the array acoustic logging information of a known well; performing layered segment statistics on characteristic values of the multiple fracture attribute parameter curves, and collecting fracture effectiveness characterization parameters corresponding to each layer segment; drawing cross plots of various logging fracture attribute parameter characteristic values and fracture effectiveness characterization parameters, determining a quantitative characterization relation between the logging fracture attribute parameter characteristic values and the fracture effectiveness characterization parameters and correlation between the logging fracture attribute parameter characteristic values and the fracture effectiveness characterization parameters, and extracting logging fracture attribute parameters sensitive to fracture effectiveness; determining logging fracture attribute parameter lower limit values corresponding to the effective fractures and different grades of fractures; and formulating an effective crack and crack grade logging comprehensive evaluation standard table, evaluating the logging crack attribute parameter characteristic value corresponding to the new well by using the comprehensive evaluation standard table, and determining the effectiveness and grade of the crack. The method is simple and good in accuracy and reliability.

Description

technical field [0001] The invention relates to the field of applied geophysical well logging, in particular to a fracture effectiveness evaluation method based on image logging and array acoustic logging data. Background technique [0002] With the in-depth development of the oil and gas industry, it is increasingly difficult to find large-scale integrated high-porosity and high-permeability sandstone reservoirs, and many large companies have to shift their attention to the exploration and development of fractured-complex lithology reservoirs. Tight fractured oil and gas reservoirs are one of the important fields for increasing oil reserves and production in the 21st century. In my country, the proportion of fractured low-permeability reservoirs is more prominent, and the oil and gas production of fractured low-permeability reservoirs accounts for half of the total oil and gas production. More than two-thirds of the oil and gas reserves ready to be put into production in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 蔡明冯爱国廖勇何浩然田海涛唐军石文睿魏炜桑晓飞章成广石元会曾保林曾芙蓉汪成芳季运景郑旻千
Owner YANGTZE UNIVERSITY
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