干涉型光纤地震检波器研发及效果分析

Development and application effect analysis of fiber interferometric geophone

光纤传感器具有高灵敏度、大带宽、抗电磁干扰能力强等技术优势,光纤地震检波器采集系统是近年来地震勘探领域研发的热点。在研究干涉型光纤检波器基本构成、传感原理及干涉型光纤检波器采集系统构成的基础上,设计和开发了适用于陆地油气勘探的16道光纤检波器采集系统样机。通过现场地震数据采集,对光纤检波器、动圈式检波器和压电式检波器进行了对比测试,并对试验资料进行了处理分析,结果显示,光纤检波器具有更高的灵敏度、更大的带宽和更好的高频响应,有利于提高地震信号采集精度,改善地震勘探效果,为光纤检波器的推广应用提供了科学依据。

Fiber sensor has many advantages,such as sensitivity,broadband,immune to electromagnetic interference etc.Development of fiber geophone seismic acquisition system is popular in recent years.Aiming at land hydrocarbon exploration and development,sixteen-channel fiber geophone system has been designed and developed on the basis of interferometric technique of fiber.The principles and structures of the fiber interferometric geophone are presented.Field trail has been done with the sixteen-channel fiber geophone system by comparing with coiled geophone and land hydrophone.The testing indicates that the fiber geophone owns higher sensitivity,larger bandwidth and better high-frequency responses,which is beneficial for enhancing acquisition accuracy of seismic data and improving seismic exploration results,provides scientific criteria for its further promotion and application.