AN EXPERIMENT STUDY ON THE ACOUSTIC CHARACTERISTICS OF PORES AND FRACTURES IN ROCK SAMPLES
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摘要: 作者采用超声波测量技术,对长庆气田储层岩样孔隙和裂缝情况进行测量和研究。研究中,对穿透岩样的声波中携带的大量关于其内部结构的信息,通过接收声波的运动学(如波速)和动力学(如波形、波谱)特征的综合对比,对岩样内部孔隙、裂缝是否发育及发育程度作出了定性和半定量分析。首先,孔隙、裂缝的存在使岩样波速偏低,其中裂缝对波速的影响较大,尤其是未完全充填的裂缝。其次,孔隙、裂缝发育的岩样的接收波形表现出不同程度的初动弱、振幅低和能量衰减现象,其中孔隙的影响更明显;但完全充填的孔隙和裂缝对波形几乎没有影响。最后,孔隙、裂缝对波谱的影响表现在对波谱中高、中、低频成分滤波作用的差异。此外,在孔隙、裂缝发育的岩样中还存在着较为明显的波速各向异性。Abstract: To investigate the pores and fractures of rock samples from the reserviors of Changqing gasfield,the P wave ultrasonic data with the samples were measured.Much useful information about the inner structure of the samples can be learned from P waves penetrated them.Based on the synthetic analysis of kinematic (such as wave velocity) and dynamic (such as waveform,spectrum) characteristics,qualitative or semi quantitative information about pores and fractures in samples can be determined.Firstly,the existence of pores and fractures makes wave velocity lower,and it is much more obvious for fractures especially those without being fully filled.Secondly,the waveform of samples with pores and fractures shows certain weak break,low amplitude and acoustic attenuation,but well-filled pores have few infleunce on them.Lastly,the influence of pores and fractures on spetrum can be indicated by different filtration of high,middle and low frequency spectrum.Besides,samples with pores and fractures obviously appear velocity anisotropy.
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Key words:
- acoustic characteristics /
- pore /
- fracture /
- rock sample
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[1] 马永生,等.碳酸盐岩储层沉积学[M].北京:地质出版社,1999.260-270. [2] 张进,张庆龙,等.相关褶皱—鄂尔多斯盆地中的构造样式[J].石油实验地质,1999,21(1):61-65. [3] 余春昊,李长文.利用斯通利波信息进行裂缝评价[J].测井技术,1998,22(4):273-277. [4] 周继宏.探测井附近裂缝及其中流体性质的实验初探[J].测井技术,1999,23(1):6-8. [5] 冯敬英,何建军,高向东,等.辽河油田某地区孔隙度的预测[J].矿物岩石,1999,19(5):25-28. [6] 罗朝盛,董庆德,王克协.孔隙地层探井中首波的共振与衰减的数值研究[J].计算物理,1998,15(5),629-634. [7] 边瑞雪,邓少贵,张立鹏,等.地层纵横波幅度与裂缝倾角及张开度的关系[J].测井技术,1998,22(5):327-331. [8] Theodoros Klimentos.Attenuation of P and S-wave as a method of distinguishing gas and condensate from oil and water[J].Geophysis,1995,60(2):447-458. [9] 韩绪山.声波扫描成像在石灰岩地层中的应用[J].煤炭地质与开发,1999,增刊:70-72. [10] 王让甲.声波岩石分级和岩石动弹性力学参数的分析研究[M].北京:地质出版社,1997.131. [11] 刘彤,徐鸣洁,等.风化花岗岩声谱特征分析[J].高校地质学报,2000,6(4):588-594. [12] 刘斌,葛宁洁,Kern H,等.不同温压条件下蛇纹岩和角闪岩中波速与衰减的各向异性[J].地球物理学报,1998,41(3):371-381. [13] 刘斌,Kern H,Popp T.不同围压下孔隙度不同的干燥及水饱和岩样中的纵横波速度及衰减[J].地球物理学报,1998,41(4):537-546.
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