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透射槽波多属性融合勘探方法可行性研究

Feasibility study on multi-attribute fusion technology of transmission channel wave and its application

  • 摘要: 槽波勘探是深部煤层构造探测的主要方法之一,具备突破煤层隐伏小断层精准探测难题的潜力。该方法通常是利用槽波的速度和振幅衰减特征,当检波器耦合差或地质异常较强时,反演结果的稳定性和精度会受到较大影响。为提高槽波勘探结果的稳定性,拓展槽波勘探的应用潜力,提出了透射槽波多属性融合勘探方法。槽波具有独特的频率和波形特征,可以计算得到丰富的专有属性,多属性特分析和融合会有助于进行煤层构造的识别。给出了计算槽波质心频率、弧长、带宽以及频谱比4个槽波属性的方法,实现了槽波质心频率、弧长、带宽和频谱比4个属性的加权数据融合。通过带有断层构造的数值模拟试验,分析认识到4个属性融合结果更符合线性衰减特征,对于断层构造的响应更为稳定和敏感。通过对实测试验采集到的槽波数据进行处理和分析,得到了透射槽波4个属性的线性层析成像和融合结果。槽波质心频率、弧长和频谱比3个属性融合对大型走向断层的形态刻画较好,槽波质心频率、带宽和频谱比3个属性融合对小型断层等异常响应更为敏感,四属性融合参数对煤层工作面内的6个大小不一的断层均有反应。提出并实现了透射槽波的多属性融合层析成像方法,验证了该方法对煤层地质构造勘探的有效性,并在实际应用中展现出了更高的稳定性和准确性,为槽波勘探数据处理提供了一种全新的思路。

     

    Abstract: In-Seam Seismic is a key method for exploring geological structures within deep coal seams and has the potential to overcome the challenge of accurately detecting hidden, small-scale faults.This method primarily utilizes the velocity and amplitude attenuation characteristics of channel waves. However, the stability and accuracy of inversion results are significantly affected when geophone coupling is suboptimal or geological anomalies are pronounced.To enhance the stability of transmitted channel wave exploration results and expand its application potential, this study introduces a multi-attribute fusion exploration method.Channel waves have unique frequency and waveform characteristics, enabling the derivation of a comprehensive set of proprietary attributes.The application of multi-attribute analysis and fusion can assist in identifying coal seam structures.The methods for calculating four channel wave attributes—centroid frequency, arc length, bandwidth and spectral ratio—are presented, and a weighted data fusion approach was developed for these attributes.Upon analyzing the numerical simulation results of the model featuring a fault, it becomes evident that the four-attribute fusion data exhibits a closer-to -linear attenuation trend with distance and demonstrates greater stability and sensitivity in responding to fault geological anomalies.By processing and analyzing tomographic imaging results of field measured data, the four attributes and fusion of transmitted channel waves were successfully obtained.The fusion of centroid frequency, arc length, and spectral ratio provides superior characterization of large-scale faults, while the combination of centroid frequency,bandwidth and spectral ratio shows enhanced sensitivity to small faults and other anomalies. The four-attribute fusion of channel wave collectively responded to varying sizes of six faults in the coal seam working face.The multi-attribute fusion tomography method of transmitted channel wave was proposed and implemented. Its effectiveness for geological structure exploration in coal seams was verified. Moreover, it has demonstrated greater stability and accuracy in field applications, presenting a novel idea for channel wave data processing.

     

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