| 郭同政,许孝凯,张晋言,晁永胜,翟勇.反射波测井的菲涅尔带效应[J].,2023,42(5):923-929 |
| 反射波测井的菲涅尔带效应 |
| Fresnel-zone of acoustic reflection logging |
| 投稿时间：2022-12-15 修订日期：2023-08-29 |
| 中文摘要: |
| 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。本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距离的变化特征。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。 |
| 英文摘要: |
| Based on reflection wave from the outside interface, single well remote detection logging is an important 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 distance 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. |
| DOI：10.11684/j.issn.1000-310X.2023.05.004 |
| 中文关键词: 远探测，声波测井，反射横波， 反射纵波 菲涅尔带 |
| 英文关键词: Remote-detecting, acoustic logging, shear reflection, compressional reflection,Fresnel-zone |
| 基金项目: |
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