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第 42 卷 第 5 期                                                                       Vol. 42, No. 5
             2023 年 9 月                          Journal of Applied Acoustics                 September, 2023

             ⋄ 研究报告 ⋄


                                  反射波测井的菲涅尔带效应



                              郭同政     1    许孝凯      2†   张晋言      3    晁永胜     2    翟 勇    1



                                            (1 中石化经纬公司胜利测井公司        东营   257061)
                                         (2 中石化经纬公司地质测控技术研究院           东营   266555)
                                                (3 中石化经纬公司      青岛   100190)
                摘要：基于反射波的单井远探测是声波测井发展的一个重要里程碑，可以有效探测距离井数米到数十米的异
                常反射体如裂缝，极大提升了声波测井的径向探测距离，在碳酸盐岩缝洞储层勘探开发有重要的作用。该文系
                统考察了有限尺寸裂缝的反射强度与声源频率和反射体宽度的变化特征。模拟结果表明，无论是单极子还是
                偶极子，反射波的幅度都呈现出菲涅尔带效应。在一定距离内，反射波幅度随裂缝某一方向如宽度增大而增
                大，当宽带增加一定尺寸后，反射波幅度有一定的程度下降，然后小幅震荡。总之，反射波幅度与反射体尺寸不
                是简单的正相关，因此，基于反射波能量来评价反射体体积和储量是有条件的。
                关键词：远探测；声波测井；反射横波；反射纵波；菲涅尔带
                中图法分类号: P631.5          文献标识码: A          文章编号: 1000-310X(2023)05-0923-07
                DOI: 10.11684/j.issn.1000-310X.2023.05.004


                                 Fresnel-zone effect of acoustic reflection logging



                   GUO Tongzheng  1   XU Xiaokai 2   ZHANG Jinyan  3   CHAO Yongsheng  2   ZHAI Yong  1

                           (1 Shengli Well Logging Company, Sinopec Matrix Corporation, Dongying 257061, China)
                      (2 Research Institute of Geological Measurement and Control Technology, Sinopec Matrix Corporation,
                                                   Dongying 266555, China)
                                        (3 Sinopec Matrix Corporation, Qingdao 100190, China)

                 Abstract: Based on reflection wave from the outside interface, single well remote detection logging is an im-
                 portant milestone in the development of borehole acoustic logging. It can effectively detect abnormal reflectors
                 such as fractures that are several meters to tens of meters away from the well, greatly improving the radial
                 detection distance of acoustic logging, and plays an important role in the exploration and development of
                 carbonate fracture cave reservoirs. In this paper, the characteristics of the variation of the reflection intensity
                 of a finite size crack with the sound source frequency and the reflector width are systematically investigated.
                 The simulation results show that the amplitude of the reflected wave presents Fresnel band effect whether
                 it is monopole or dipole. Within a certain distance, the amplitude of the reflected wave increases with the
                 increase of the width in a certain direction of the fracture. When the broadband increases to a certain size,
                 the amplitude of the reflected wave decreases to a certain extent, and then oscillates slightly. In a word, the
                 amplitude of reflected wave is not simply positively related to the size of reflector. Therefore, it is conditional
                 to evaluate the volume and reserves of reflector based on reflected wave energy.
                 Keywords: Remote-detecting; Acoustic logging; Shear reflection; Compressional reflection; Fresnel-zone


             2022-12-15 收稿; 2023-03-14 定稿
             作者简介: 郭同政 (1974– ), 男, 山东东营人, 本科, 研究方向: 测井仪器研发及新技术应用。
              通信作者 E-mail: xuxiaokai@foxmail.com
             †
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