| 李丹,乔文孝,车小花,鞠晓东.井旁溶洞的偶极反射声波测井响应研究*[J].,2019,38(5):767-773 |
| 井旁溶洞的偶极反射声波测井响应研究* |
| Study on the response of dipole reflected acoustic imaging the near-borehole cave |
| 投稿时间：2019-01-26 修订日期：2019-09-04 |
| 中文摘要: |
| 反射声波成像测井是适应复杂地区勘探开发的一种测井新技术,能够对井旁几米至几十米内声阻抗不连续的地层界面、裂缝、溶洞、盐丘等不同地质构造进行探测评价。针对井旁存在一个不同尺度大小的溶洞时的偶极反射声波测井响应进行了数值模拟,得到了不同情况下的回波信号,探究了地层横波波长与井旁溶洞尺度之间的关系。研究结果表明,等源距阵列波形中,溶洞的回波波列有特殊的“抛物线”型形态,上提过程中距溶洞最近时,回波到时最早、幅度最大。当井旁溶洞直径逐渐增大时,回波信号幅度越强,反射横波偏移成像的结果越清晰。通过本文研究,初步形成了一种反射声波测井评价井旁溶洞的方法。 |
| 英文摘要: |
| Reflected acoustic imaging logging is a new well logging technique for exploration and development in complex areas, detecting and evaluating different geological structures such as interfaces, cracks, caves and salt domes with acoustic impedance discontinuities ranging from a few meters to several tens of meters near the well. A 2D finite-difference model has been used to simulate the elastic wave-field of a cave of different size near the borehole, obtain and process the echo wave in different situation, exploring the relationship between the shear wavelength and the size of the cave near the borehole. The results show the echo wave of the cave has a special "parabolic" shape in common offset gather. When it is closest to the cave during the lifting process, the echo time arrives earliest and the amplitude is largest. When the size of the cave near the borehole is larger, the amplitude of the echo signal is the stronger. A method for evaluating the cave near the well by reflection acoustic logging is preliminarily formed through this paper. |
| DOI：10.11684/j.issn.1000-310X.2019.05.002 |
| 中文关键词: 反射声波测井,偶极横波,井旁溶洞 |
| 英文关键词: dipole shear wave, reflection acoustic imaging instrument, cave near borehole |
| 基金项目:国家自然科学基金项目(41874210,11734017), 国家科技重大专项(2017ZX05019001, 2017ZX05019006), 中国石油科技创新(2016D-5007-0303), 中国石油大学(北京) 基金(2462016YJRC020) |
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