声波测井模型井实验研究  

Study of model well test for acoustic log.

作　　者：李山生[1] 沈建国[2] 

机构地区：[1]胜利油田测井公司 [2]天津大学药物科学与技术学院

出　　处：《石油地球物理勘探》2004年第2期187-190,197,共5页Oil Geophysical Prospecting

摘　　要：本文通过声波测井模型井实验 ,讨论了模型井外径对声波波形的影响。当模型井的径向厚度较大时 ,二维谱中纵波速度线附近的模式波类型较多 ,空间分布较密集 ,幅度也较大 ;当模型井的径向厚度较小时 ,模式波的空间分布较稀疏。实验和数值计算表明 ,当两个不同模型井的径向厚度均大于一个波长时 ,两组测量波形中的低频斯通利波和幅度较小的首波基本重合 ,而首波和斯通利波之间的波形相差较大。数值计算结果和实验结果一致。文中结合模型井声波波形的二维谱及其模式波的数值计算结果 ,还讨论了声波测井探测深度与波形形状之间的关系 。Through the model well test of acoustic log,the paper discussed the affect of outer radius of model well on acoustic waveform.There are a lot of mode wave patterns near P-wave velocity line in 2-D spectrum,which have dense special distribution and large amplitude when the radial thickness of model well is thicker ; the space distribution of mode wave is sparse when the radial thickness of model well is thinner.The experiments and numeric calculation showed that the Stoneley wave with lower frequency basically coincides with primary wave having smaller amplitude in two groups of measured waveform and the waveform has larger difference between primary wave and Stoneley wave when the radial thickness of both different model wells is greater than one wavelength. The result of numeric calculation is consistent with experiments result.Combining with 2-D spectrum of acoustic waveform of model well and numeric results of mode wave,the paper discussed the relation between detecting depth of acoustic log and waveform configuration,providing a certain experimental basis for further studying the data processing method for waveform of acoustic wavetrain log.

关 键 词：声波测井技术 模型井 首波 斯通利波 波形 数据处理方法 

分 类 号：P631.814[天文地球—地质矿产勘探]