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Sound wave experiment method and identification method for tight sandstone fracture

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

Active Publication Date: 2015-11-18
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 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 level

Method used

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  • Sound wave experiment method and identification method for tight sandstone fracture
  • Sound wave experiment method and identification method for tight sandstone fracture
  • Sound wave experiment method and identification method for tight sandstone fracture

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides an acoustic wave experimental method for tight sandstone fractures, such as Figure 1 to Figure 6 shown, including steps:

[0035] S1, vertically saw a fixed-length measured core into two pieces for simulating tight sandstone fractures, planing and smoothing the incision, then vacuumize, weigh once and record; re-saturated with fresh water, weigh at the same time, and under vacuum The measured weight is combined with the core porosity obtained by weighing method, and then wrapped in plastic wrap for later use. The measured core has a length of 5 cm and a diameter of 2.5 cm;

[0036] S2, such as figure 1 As shown, the digital oscilloscope is connected with the ultrasonic square wave pulse generator / receiver, and the sending transducer and the receiving transducer connected to the ultrasonic square wave pulse generator / receiver are installed in the two rock clamps after processing respectively. The two ends of the holder, the digital oscilloscop...

Embodiment 2

[0052] This embodiment provides an identification method for tight sandstone fractures, the identification method is based on the formula y=B×e for determining the width of micron-scale fractures in the above-mentioned Example 1 A·x Identify tight sandstone fractures, such as Figure 7 As shown, among them, the first track shows the depth, the second track is the lithology logging curve, the fourth track is the formation porosity calculation curve, the filling part is the pore space, and the fifth track is the normalized compressional wave and shear wave amplitude curve , Track 6 is the P-wave attenuation curve, and Track 7 is the fracture width curve, including the fracture width calculated from the P-wave attenuation coefficient and the fracture width calculated from the S-wave attenuation coefficient. From the rightmost one in the figure, it can be seen that the fracture width calculated from the attenuation coefficients of P-wave and S-wave shows that the fracture width in...

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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 [0001] The invention relates to a logging evaluation technology for oil and gas exploration, in particular to an acoustic wave experiment method and identification method for tight sandstone fractures. Background technique [0002] Fracture identification in tight sandstone is a difficult problem in well logging evaluation. In the past, micro-resistivity scanning imaging logging was often 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 microfracture formations, especially in oil-based mud wells, the application effect is not ideal, and acoustic logging is less affected by the mud properties in the well. Therefore, formation fractures can be identified by acoustic wave amplitude attenuation. [0003] The relationship between acoustic amplitude attenuation and fracture characteristics has been studied theoretically; however, due to the limitation of ex...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 章成广唐军郑恭明陈义群
Owner YANGTZE UNIVERSITY
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