奇异的波至现象

於文辉; 张丽琴; 王家映; 周玉琦

Volume 27 Issue 5

Sep. 2002

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WU Wen-hui, ZHANG Li-qin, WANG Jia-ying, ZHOU Yu-qi, 2002. Strange Phenomena of Wave Arrival. Earth Science, 27(5): 651-658.

Citation:

WU Wen-hui, ZHANG Li-qin, WANG Jia-ying, ZHOU Yu-qi, 2002. Strange Phenomena of Wave Arrival. Earth Science, 27(5): 651-658.

WU Wen-hui, ZHANG Li-qin, WANG Jia-ying, ZHOU Yu-qi, 2002. Strange Phenomena of Wave Arrival. Earth Science, 27(5): 651-658.

Citation:

WU Wen-hui, ZHANG Li-qin, WANG Jia-ying, ZHOU Yu-qi, 2002. Strange Phenomena of Wave Arrival. Earth Science, 27(5): 651-658.

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Strange Phenomena of Wave Arrival

Received Date: 2002-03-06
Publish Date: 2002-09-25

Abstract

Abstract

The authors worked in 1997 on the high resolution VSP in the hydraulic fractured sandstone oil well. The authors observed not only the normal compressional waves and converted waves, but also several strange slow speed waves from the oil producing layer. Since the nature of this slow speed wave arrival was not distinct, these slow speed waves were named as W₁, W₂ and W₃ respectively (where W stands for wave), according to their apparent velocities ranging form high to low. Five reflected waves which are reflected compressional wave, reflected converted wave, W₁, W₂ and W₃ were observed at the depth of 1 210 m in the fracture dominating direction in Shun 5 Well. W₂ and W₃ did not occur in the fracture non dominating direction. Four reflected waves which are reflected compressional wave, reflected converted wave and two slow speed waves named as W₄ and W₅ for the distinction from the slow speed waves in Shun 5 Well, were observed. The data on well boring, well logging, surface seism and inter well borehole seism are employed in this research to make a detailed analysis of the slow speed waves thus observed. The analytical results show that these slow waves are not diffracted waves from heterogeneous medium and that the reflected waves from the lateral interface, channel waves, tube waves and stoneley waves are also not in agreement with the dynamic feature of the Biot slow speed compressonal waves. Existing wave theory does not interpret this kind of slow speed wave arrivals, indicating that some laws of elastic wave propagation in the inner medium of the earth are still not recognized by the scientists concerned.
- sandstone,
- oil producing well,
- VSP,
- slow speed wave arrival

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References(36)

References

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