High-order Azimuth Coherent Imaging for Microseismic Location

IF 1.6 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Ying Shi, Xuebao Guo, Youqiang Yu
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Abstract

The cross-correlation-based methods, widely used for microseismic monitoring, utilize cross-correlation to extract time differences of signals within station pairs, and subsequently use these time differences for back-projection and localization, without the need for triggering moment scanning. The selection of imaging conditions, applied to the spatial projection of all cross-correlation records determines the noise resistance and resolution of such methods. To fully exploit the azimuthal properties of station pairs for constraining the source imaging, we propose a high-order azimuth coherent imaging condition, which involves the following steps: (1) Choosing station pairs that meet specific inter-station distance criteria; (2) Combining station pairs into dual-station pairs that satisfy a certain inter-station pair angle criterion; (3) Further combining station combinations pairwise to form the final set of station pairs; (4) Multiplying the projection results of station pairs within each combination from the third step; (5) Summing the results of all combinations. This method effectively suppresses the hyperboloid in the spatial projection of a single station, enhances the coherence of seismic source imaging, and maintains noise resistance. Compared to the conventional imaging conditions, the method proposed has demonstrated superior resolution and robustness in both theoretical analysis and practical testing.
用于微地震定位的高阶方位相干成像
广泛用于微地震监测的基于交叉相关的方法,利用交叉相关提取站对内信号的时差,然后利用这些时差进行反投影和定位,而无需触发时刻扫描。选择适用于所有交叉相关记录空间投影的成像条件,决定了此类方法的抗噪能力和分辨率。为了充分利用台站对的方位特性来约束源成像,我们提出了一种高阶方位相干成像条件,包括以下步骤:(1) 选择符合特定台站间距离标准的台站对;(2) 将台站对组合成符合特定台站对间角度标准的双台站对;(3) 进一步将台站组合成对,形成最终的台站对集合;(4) 将第三步中每个组合内的台站对投影结果相乘;(5) 将所有组合的结果相加。该方法有效抑制了单个台站空间投影中的双曲面,增强了震源成像的一致性,并保持了抗噪性。与传统的成像条件相比,所提出的方法在理论分析和实际测试中都表现出更高的分辨率和鲁棒性。
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来源期刊
Journal of Geophysics and Engineering
Journal of Geophysics and Engineering 工程技术-地球化学与地球物理
CiteScore
2.50
自引率
21.40%
发文量
87
审稿时长
4 months
期刊介绍: Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.
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