Crosscorrelation migration of microseismic source locations with hybrid imaging condition
Crosscorrelation migration of microseismic source locations with hybrid imaging condition
复制标题
混合成像条件下微震震源位置的互相关偏移
DOI：
10.1190/geo2020-0896.1
复制
发表时间：
2022-01-01
期刊：
影响因子：
3.3
通讯作者：
Chang, Xu
中科院分区：
文献类型：
--
作者：
Wu, Shaojiang;Wang, Yibo;Chang, Xu
在非常规油气勘探中，定位微地震源对于监测流体提取/注入期间发生的水力裂缝至关重要。基于波形的地震定位方法可以在不拾取相位的情况下可靠且自动地成像弱微地震源位置。其中，互相关偏移（CCM）方法通过生成虚拟道集来避免激发时间扫描。提出了一种基于混合成像条件的CCM定位方法。在该方法的实施中有四个主要步骤：1）选择具有良好方位角覆盖的接收器; 2）通过将参考接收器与其余接收器相关来生成虚拟道集; 3）对虚拟道集中的反投影求和;以及4）对所有求和进行相乘。在合成数据集和野外数据集上对CCM-HIC方法进行了测试，并与传统的求和成像条件（SIC）和乘法成像条件（MIC）进行了比较。对比结果表明，CCM-HIC具有足够的鲁棒性，即使在强噪声存在的情况下，也能获得更好的稳定性和更高的空间分辨率的源定位图像。
Locating microseismic sources is critical to monitor the hydraulic fractures that occur during fluid extraction/injection in unconventional oil or gas exploration. Waveform-based seismic location methods can reliably and automatically image weak microseismic source locations without phase picking. Among them, the cross-correlation migration (CCM) method can avoid excitation time scanning by generating virtual gathers. We propose a CCM location method based on the hybrid imaging condition (HIC). There are four main steps in the implementation of this method: 1) selection of receivers with good azimuthal coverage; 2) generation of virtual gathers by correlating the reference receiver with the rest of the receivers; 3) summation of back-projections in the virtual gathers; and 4) multiplication of all summations. The CCM-HIC method was tested on synthetic and field datasets, and the results were compared with those obtained by conventional summation imaging condition (SIC) and multiplication imaging condition (MIC). The comparison results demonstrate that the CCM-HIC is sufficiently robust to obtain better stability and higher spatial resolution image of source location, despite the presence of strong noise.