Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 176-184.doi: 10.12108/yxyqc.20250316

• PETROLEUM EXPLORATION • Previous Articles    

Influence of inclined micro-fractures on shearwave attenuation in limestone

ZHOU Qingwen1,2, WU Dong3, CAI Ming1,2, ZHANG Chengguang1,2, CHEN Yuanbo4, LIN Wang3, ZHANG Yuanjun1,2, LI Zhi1,2   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education(Yangtze University), Wuhan 430100, China;
    2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China;
    3. Information Center, Engineering Technology R & D Company Limited, CNPC, Beijing 102206, China;
    4. No. 1 Oil Production Plant, Northwest Oilfield Company, SINOPEC, Luntai 841604, Xinjiang, China
  • Received:2024-07-23 Revised:2024-09-04 Published:2025-05-10

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Abstract: To solve the problem of fine evaluation of microfractures in limestone reservoirs，based on the prin‐ciple of acoustic propagation，acoustic physical experiments were carried out under different fracture conditions （fracture dip angle and fracture aperture），and a characterization model of fracture parameters was established to quantitatively analyze the effects of fracture inclination and fracture opening on shear wave attenuation. The model has been applied to the first member of the Paleogene Shahejie Formation in Caofeidian area，Bohai Bay Basin. The experimental results show that：（1）Five groups of artificial fracture cores with different inclinations， including 0，25°，40°，55° and 70°，are designed in the acoustic physics experiment of microfracture cores in limestone reservoirs. 9 PET films of 25 μm，50 μm，100 μm，150 μm，200 μm，300 μm，400 μm，500 μm and 1 000 μm were used as 9 different fracture aperture degrees. The acoustic wave frequency was maintained at 250 kHz，and the transverse wave waveform under 9 fracture aperture conditions was measured for 5 groups of cores respectively. 32 channels of waveform data were continuously collected for each group of experiments，and the optimal waveform signal was obtained by filtering 32 channels of waveform through noise filtering program and superposition.（2）The acoustic physical test results show that the shear wave attenuation is greatly affected by fractures，and the attenuation trend gradually slows down with the increase of fracture aperture. The attenuation coefficient increases logarithmically with the increase of fracture aperture. When the fracture aperture is less than or equal to 300μm，the attenuation coefficient is more sensitive. Under the condition of the same fracture aperture degree，the shear wave attenuation coefficient decreases with the increase of fracture dip angle when the fracture dip angle is 0-40°，and increases with the increase of fracture dip angle when the fracture dip angle is greater than 40°.（3）The fracture parameter characterization model（Formula 3）is obtained based on the core physical experiment.（4）The relative error of fracture opening degree obtained by the fracture parameter characterization model in the first member of Paleogene Shahejie Formation in Caofeidian area of Bohai Bay Basin is 4.57% and the mean absolute deviation is 18.9 μm，indicating a high agreement.

Key words: rock physics experiment, shear wave attenuation, fracture dip angle, fracture aperture, fracture parameters inversion model, array sonic log, limestone, the first member of Shahejie Formation, Caofeidian area

CLC Number: 

  • P631.8
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