| 奇异的波至现象 |
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| 引用本文： | 於文辉,周玉琦,等.奇异的波至现象[J].地球科学,2002,27(5):651-658. |
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| 作者姓名： | 於文辉 周玉琦 |
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| 作者单位： | [1]中国地质大学地球物理系，湖北武汉430074 [2]中国新星石油公司，北京100083 |
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| 摘 要： | 1997年，笔者在水力压裂后砂岩产油井中进行高分辨率VSP工作时，除观测到常规纵波及转换波,还观测到来自产油层的几种奇异的慢速波至。由于该慢速波至的性质不明，按视速度从高到低分别命名为W1，W2，W3，…（W为wave的第1个字母），在顺5井裂隙优势方向，1210m深度上观测到5种反射波；反射纵波，反射转换波，W1，W2，W3波，在裂隙非优势方向上，W2，W3波没有出现，在顺4井1532m深度上观测到4种反射波；反射纵波，反射转换波，还有2种慢速波至，为了区别于顺5井中观测到的慢速波至，将其命名为W4，W5波。结合该区钻井，测井，地面地震，井间地震等资料对观测到的慢速波至进行了详细分析，分析结果表明：该慢速波至既不属于不均匀介质产生的绕射波，侧界面产生的反射波，槽波，管波，斯通利波，也与Biot慢纵波动力学特征相悖，现有波动理论不能解释这种慢速波至现象，这意味着地球内部介质中存在人类还未认识的弹性波传播规律。
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| 关 键 词： | 砂岩 产油井 VSP 慢速波至 双相介质 纵波 转换波 弹性波 |
| 文章编号： | 1000-2383(2002)05-0651-08 |
Strange Phenomena of Wave Arrival |
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| YU Wen hui ,ZHANG Li qin ,WANG Jia ying ,ZHOU Yu qi.Strange Phenomena of Wave Arrival[J].Earth Science-Journal of China University of Geosciences,2002,27(5):651-658. |
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| Authors: | YU Wen hui ZHANG Li qin WANG Jia ying ZHOU Yu qi |
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| Institution: | YU Wen hui 1,ZHANG Li qin 1,WANG Jia ying 1,ZHOU Yu qi 2 |
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| 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 W 1, W 2 and W 3 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, W 1, W 2 and W 3 were observed at the depth of 1 210 m in the fracture dominating direction in Shun 5 Well. W 2 and W 3 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 W 4 and W 5 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. |
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| Keywords: | sandstone oil producing well VSP slow speed wave arrival |
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