| 晁永胜,李超,贺洪斌,许孝凯,任燕敏,纪祝华,曹雪砷.方位偶极声波远探测技术研究与应用*[J].,2023,42(2):416-426 |
| 方位偶极声波远探测技术研究与应用* |
| Research and application of azimuth dipole acoustic remote detection technology |
| 投稿时间：2022-09-06 修订日期：2023-02-27 |
| 中文摘要: |
| 偶极横波远探测测井技术是当前缝洞型和复杂储层油气勘探开发和评价不可缺少的技术手段。常规偶极远探测技术受限于180°方位的不确定性，难以判别缝洞等地质体的真实方位。采用双偶极错位发射多分量阵列接收研究偶极方位识别方法。首先以传统正交偶极模式获得地质体方位探测结果，再以45°错位角发射偶极声波信号，通过多个邻近接收器的波形差的组合以及反射波在仪器孔径上的时间延迟来区分方位，进一步压制伪像干扰获得地质体真实的方位成像结果。针对弱反射信号，在硬件上，研究了多分量有源接收器阵列声系，有效提升了偶极声波信号信噪比，结合动态增益控制提升反射波幅度；研究了双偶极宽频发射器与多模式发射技术，提高偶极发射功率，保证了偶极声波信号在地层中远距离传播与反射。数值仿真与实际测井数据表明，双偶极方位识别方法可行，有助于偶极横波远探测技术的进一步发展和应用。 |
| 英文摘要: |
| Dipole shear wave remote detecting logging technology is an indispensable technical method for oil and gas exploration, development and evaluation of fracture-cave and other complex reservoirs. Conventional dipole remote detecting technology is limited by the uncertainty of 180-degree azimuth, and it is difficult to distinguish the true azimuth of fracture-cave and other geological targets. In this research, the method of dipole azimuth recognition is studied by using the multi-component array receiving of double dipole staggered emission. First, the azimuth detection results of the geological body are obtained in the traditional cross-dipole mode, and then the dipole acoustic signal is transmitted at a 45-degree dislocation angle. The true azimuth is distinguished by the combination of the waveform differences of multiple adjacent receivers and the time delay of the reflected wave on the instrument aperture. Finally, true azimuth imaging results of the geological body is obtained by further suppressing the artifact interference. For the weak reflections, the acoustic system of multi-component active receiver array is studied to effectively improve the signal-to-noise ratio of dipole acoustic signal. The amplitude of reflected wave is improved in combination with dynamic gain control. The dual dipole broadband transmitter and multi-mode transmission technology are studied to improve the dipole transmission power and ensure the long-distance propagation and reflection of dipole acoustic signals in the formation. The numerical simulation and field logging data show that the dual-dipole azimuth recognition method is feasible. And the results will benefit the further development and application of dipole shear wave remote detecting technology. |
| DOI：10.11684/j.issn.1000-310X.2023.02.026 |
| 中文关键词: 偶极方位识别 双错位偶极 有源声波接收 宽频带偶极发射 |
| 英文关键词: Azimuth identification for dipole wave Double staggered dipoles Active acoustic wave receiving Broadband dipole emission |
| 基金项目:中石化重大科研专项(P21084), 中国科学院科研仪器设备研制项目(GJJSTD20210008, YJKYYQ20200072), 国家重点研发计划项目(2022YFF0709704) |
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