Abstract：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.
李山生, 沈建国. 声波测井模型井实验研究[J]. 石油地球物理勘探, 2004, 39(2): 187-190,197.
Li Shansheng, Shen Jian-guo. Study of model well test for acoustic log. OGP, 2004, 39(2): 187-190,197.
