Page 15 - 应用声学2019年第5期

第 38 卷 第 5 期 Vol. 38, No. 5
2019 年 9 月 Journal of Applied Acoustics September, 2019

⋄ 2018年度全国检测声学会议优秀论文 ⋄

井旁溶洞的偶极反射声波测井响应研究 ∗

李 丹 1,2 乔文孝 1,2 车小花 1,2† 鞠晓东 1,2

(1 中国石油大学 油气资源与探测国家重点实验室 北京 102249)
(2 中国石油大学 北京市地球探测与信息技术重点实验室 北京 102249)

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。通过该研究，初步形成了一种反射声波测井评价井旁溶洞的方法。
关键词 偶极横波，反射声波测井，井旁溶洞
中图法分类号: P613.8 文献标识码: A 文章编号: 1000-310X(2019)05-0767-07
DOI: 10.11684/j.issn.1000-310X.2019.05.002

Study on the response of dipole reflected acoustic imaging

the near-borehole cave

LI Dan 1,2 QIAO Wenxiao 1,2 CHE Xiaohua 1,2 JU Xiaodong 1,2

(1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)
(2 Key Laboratory of Earth Prospecting and Information Technology, Beijing 102249, China)

Abstract 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.
Key words Dipole shear wave, Reflection acoustic imaging instrument, Cave near borehole

2019-01-26 收稿; 2019-05-07 定稿
国家自然科学基金项目 (41874210,11734017), 国家科技重大专项 (2017ZX05019001, 2017ZX05019006), 中国石油科技创新基金项目
∗
(2016D-5007-0303), 中国石油大学 (北京) 基金项目 (2462016YJRC020)
作者简介: 李丹 (1988- ), 男, 天津塘沽人, 博士研究生, 研究方向: 声波测井。
† 通讯作者 E-mail: aclab@cup.edu.cn