本文選題：碳酸鹽巖孔洞模型 + 超聲波��； 參考：《科技導報》2017年18期

【摘要】：以孔洞型碳酸鹽巖的小巖柱為對象,采用二維超聲波數(shù)值模擬與物理模型實驗相結(jié)合的方法,從運動學及動力學角度,研究了多頻率下超聲波在不同尺寸、形狀及分布的孔洞模型中的傳播特性。結(jié)果表明,不連續(xù)分布的單孔洞,其尺寸變化對聲波速度幾乎無影響但與衰減系數(shù)呈正相關(guān),在相同尺寸下隨測試頻率的增加聲波速度有增加的趨勢,衰減系數(shù)與頻率間呈冪函數(shù)遞增關(guān)系;圓形孔洞、方形孔洞對聲波速度影響與孔隙度有關(guān),孔隙度9%為臨界值,低于9%時影響不敏感(可忽略),高于9%時圓形孔洞對衰減系數(shù)的影響大于正方形孔洞的影響;橢圓形孔洞的影響與其縱橫比有關(guān),縱橫比大于1時,隨縱橫比增加衰減系數(shù)的變化幅度較小,反之則衰減系數(shù)的變化幅度較大;隨孔洞分布集中度的增加,聲波速度呈線性規(guī)律減小,衰減系數(shù)呈線性規(guī)律增加。
[Abstract]:Taking the small rock column of porous carbonate rock as an object, using the method of numerical simulation of two-dimensional ultrasonic wave and physical model experiment, the different sizes of ultrasonic wave in multi-frequency are studied from the point of view of kinematics and dynamics. Propagation characteristics in the shape and distribution of the pore model. The results show that the size change of a single hole with discontinuous distribution has little effect on the acoustic velocity, but has a positive correlation with the attenuation coefficient. At the same size, the acoustic velocity increases with the increase of the measured frequency. The influence of circular and square holes on the acoustic velocity is related to the porosity, and the porosity of 9% is the critical value. When the ratio is lower than 9, the effect of circular hole is greater than that of square hole, and the effect of elliptical cavity is related to its aspect ratio, and the aspect ratio is greater than 1. The change of attenuation coefficient is smaller with the increase of aspect ratio, but the amplitude of attenuation coefficient is larger with the increase of the concentration of hole distribution, the velocity of sound wave decreases and the attenuation coefficient increases linearly with the increase of the concentration of hole distribution.
【作者單位】： 中國科學院重慶綠色智能技術(shù)研究院;重慶礦產(chǎn)資源開發(fā)有限公司;甘肅省油氣資源研究重點實驗室;中國石油川慶鉆探工程公司地質(zhì)勘探開發(fā)研究院;中國石油西南油氣田分公司蜀南氣礦;重慶科技學院石油與天然氣工程學院;
【基金】：國家自然科學基金項目(41502287) 甘肅省油氣資源研究重點實驗室開放基金項目(SZDKFJJ20160605) 重慶市基礎與前沿研究計劃重點項目(cstc2015jcyj BX0120) 重慶市國土資源和房屋管理局科技計劃項目(CQGT-KJ-2015044)
【分類號】：O426.2
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本文編號：1783355