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Acoustic experimental method and identification method of tight sandstone fractures

A technology of tight sandstone, experimental method, applied in the direction of seismology for well logging, etc., to achieve the effect that contributes to validity, guarantees identity and guarantees accuracy

Active Publication Date: 2019-01-22
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the technical problems to be solved by the present invention is to solve the problem of identifying tight sandstone fractures on the micron scale

Method used

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  • Acoustic experimental method and identification method of tight sandstone fractures
  • Acoustic experimental method and identification method of tight sandstone fractures
  • Acoustic experimental method and identification method of tight sandstone fractures

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Abstract

The invention discloses a sound wave experiment method for a tight sandstone fracture. The sound wave experiment method comprises a step S10, according to an index fitting relationship among a longitudinal wave attenuation coefficient, a transverse wave attenuation coefficient and a micron-grade fracture width, establishing a formula for determining the micron-grade fracture width by means of the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient, y=B*e<A*x>; in the formula, y is the micron-grade fracture width; x is the longitudinal wave attenuation coefficient or the transverse wave attenuation coefficient; A is a first correction coefficient and is in 24-35; B is a second correction coefficient and is in 0.23-0.38; and the value of B is in positive correlation with the porosity of the sandstone. Furthermore the invention provides an identification method for the tight sandstone fracture. The sound wave experiment method and the identification method achieve a purpose of identifying the tight sandstone fracture in the micron-grade.

Description

Technical field The invention relates to a logging evaluation technology for oil and natural gas exploration, in particular to an acoustic wave experiment method and identification method of tight sandstone cracks. Background technique The identification of tight sandstone fractures is a difficult problem in logging evaluation. In the past, micro-resistivity scanning imaging logging was used to identify and evaluate formation fractures, and it has been well applied in water-based mud wells in carbonate formations. However, in tight sandstone micro-fractured formations, especially in oil-based mud wells, the application effect is not ideal, and the acoustic logging is less affected by the mud characteristics in the well. Therefore, the acoustic amplitude attenuation can be used to identify formation fractures. The relationship between acoustic wave amplitude attenuation and fracture characteristics has been studied theoretically; however, due to the limitation of experimental c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40
Inventor 章成广唐军郑恭明陈义群
Owner YANGTZE UNIVERSITY
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