论文详情
拓宽地震信号频带范围,实现宽频地震采集,是提高地震分辨率和成像精度的关键,用于宽频地震采集的检波器要求具有单点单支、频带宽、灵敏度高、保真度高、理想的幅频相频响应等特性。基于现有电磁式动圈检波器和MEMS数字检波器工作原理和实际应用效果分析,结合两种检波器的技术优势,开展了新型检波器的设计和研发,并对新型检波器进行了特性参数实验室测试,验证了新型检波器的宽频特性。将新型检波器与自然频率为10 Hz和5 Hz的动圈检波器以及MEMS数字检波器进行了地震数据采集对比和数据处理分析,结果表明,新型检波器具有频带宽的优势,获得的剖面层间信息更为丰富,地震分辨率和成像精度明显提高,具有很好的应用前景。
Improved seismic resolution and imaging accuracy require the acquisition of a broader seismic bandwidth.Geophones,therefore,need to evolve toward high fidelity sensors that are sensitive across a broad frequency band,and yield ideal amplitude and phase responses to meet the demand for broadband seismic acquisition.By combining the advantages of existing electromagnetic moving-coil geophones and microelectromechanical system (MEMS)-based digital geophones,a novel accelerometer sensor is designed.The proposed geophone outperformed three types of industry geophones over a broad frequency band:MEMS-based digital geophone and moving-coil geophones with 10-Hz,5-Hz natural frequency.Field data analysis indicated the novel geophone could obtain a wider frequency band and potentially provide more abundant stratigraphic information,which would improve seismic resolution and imaging accuracy.There are a range of future applications for these novel geophones,including oil and gas exploration,micro-seismic monitoring,and engineering seismology,that present potential application prospects.
中国石化集团公司科研计划项目(JP14039)资助。