| Numerical study on scanning radiation acoustic field in formations generated from a borehole |
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| 引用本文： | CHE Xiaohua1,ZHANG Hailan1,QIAO Wenxiao2 & JU Xiaodong2 1. Institute of Acoustics,Chinese Academy of Sciences,Beijing 100080,China, 2. Faculty of Natural Resources & Information Technology,University of Petroleum,Beijing 102249,China. Numerical study on scanning radiation acoustic field in formations generated from a borehole[J]. 中国科学G辑(英文版), 2005, 48(2) |
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| 作者姓名： | CHE Xiaohua1 ZHANG Hailan1 QIAO Wenxiao2 & JU Xiaodong2 1. Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China 2. Faculty of Natural Resources & Information Technology University of Petroleum Beijing 102249 China |
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| 作者单位： | CHE Xiaohua1，ZHANG Hailan1，QIAO Wenxiao2 & JU Xiaodong2 1. Institute of Acoustics，Chinese Academy of Sciences，Beijing 100080，China; 2. Faculty of Natural Resources & Information Technology，University of Petroleum，Beijing 102249，China |
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| 摘 要： | The directivity of acoustic transducers used in conventional acoustic logging tools is uncontrollable[1,2], which inevitably affects investigation depth and resolution. At present, deep and wide range of investigation in petroleum exploration is urgently re- quired. It is important to improve the exploration capability to find more complex and fine reservoirs[3], for which the direction of the radiated acoustic energy is a direct factor. Acoustic field in the formations generated by the source…
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Numerical study on scanning radiation acoustic field in formations generated from a borehole |
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| CHE Xiaohua,ZHANG Hailan,Qiao Wenxiao,Ju Xiaodong. Numerical study on scanning radiation acoustic field in formations generated from a borehole[J]. Science in China(Physics Astronomy), 2005, 48(2) |
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| Authors: | CHE Xiaohua ZHANG Hailan Qiao Wenxiao Ju Xiaodong |
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| Affiliation: | 1. Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, China
2. Faculty of Natural Resources & Information Technology, University of Petroleum, Beijing 102249, China |
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| Abstract: | Numerical study on scanning radiation acoustic field in formations generated by linear phased array transmitters in a fluid-filled borehole is carried out using a real axis integration (RAI) method. The main lobe width of the acoustic beams and the incident angle on the borehole wall can be controlled by means of adjusting parameters, such as the element number and the delay time between the neighboring array elements of linear phased array transmitter. The steered angle of longitudinal waves generated in the formation satisfies the Snell's law for plane waves when the incident angle on the borehole wall is less than the first critical angle. When the lobe width of the acoustic beams is narrow and the steered angle is less than the first critical angle, the acoustic field in the formation can be approximately calculated given that the linear phased array is put in the formation without borehole. The technique of scanning radiation acoustic field can be applied to enhancing investigation resolution and signal-to-noise ratio in crosswell seismic survey and borehole acoustic reflection imaging. |
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| Keywords: | formation linear phased array transmitter steered angle RAI scanning radiation. |
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