本文選題：地震波探測　切入點：干涉型光纖傳感器　出處：《南京理工大學》2017年碩士論文　論文類型：學位論文

【摘要】："高分辨率光纖油氣層監(jiān)測系統(tǒng)"(High-reso1utionFiber-opticSeismicSystem,HR-FOSS)是以光纖加速度傳感器陣列為基礎的新一代地震波探測系統(tǒng),用于油田油氣層結構和遷移的高精度實時探測。HR-FOSS技術將逐步取代傳統(tǒng)技術成為石油探采和生產(chǎn)的配套設備,是目前幾個石油探懫大國的研究熱點,是未來幾年石油探采的趨勢和方向。本論文研制了一個小規(guī)模HR-FOSS樣機系統(tǒng),為今后對商用化高分辨率光纖油氣層監(jiān)測系統(tǒng)的研制奠定技術及工藝基礎。除了檢波器數(shù)量為64個外,小規(guī)模HR-FOSS的其他技術要求與大規(guī)模系統(tǒng)基本一致,包括了多波長激光光源模塊、光學調制解調模塊、光學傳感模塊、數(shù)據(jù)處理模塊、系統(tǒng)控制電腦和系統(tǒng)電源模塊6個模塊。在整個系統(tǒng)中,本文主要設計并制作了光學調制解調模塊和光學傳感模塊,研究了離散式相位調制解調法和一種波分時分混合復用技術。研究了傳統(tǒng)石油數(shù)據(jù)與本系統(tǒng)輸出數(shù)據(jù)差異,設計并編寫了用以規(guī)范數(shù)據(jù)格式的數(shù)據(jù)讀寫動態(tài)鏈接庫。本項目采用離散式相位調制解調法,采集輸出的三個干涉光強信號,計算出振動信號引起的光信號相位變化。光束相位與振動信號具有很好的一致性。傳感系統(tǒng)采用波分時分混合復用技術,解復用時利用延時錯位耦合的方式降低系統(tǒng)串擾。項目研發(fā)過程中對64個檢波器和由其構成的傳感網(wǎng)絡進行測試,測試表明:檢波器靈敏度為1028rad/g@60Hz,線性度為0.997,共振頻率為300Hz-350Hz,高于工作頻率不影響探測性能;除4個檢波器外,其余檢波器的起振時間均相同。光纖傳感系統(tǒng)野外噪聲約為50ng√Hz@200Hz,時分復用串擾均小于-76dB,波分復用串擾均小于為-59dB。實驗證明本系統(tǒng)可以實現(xiàn)地震波的探測,同時具有探測靈敏度高、環(huán)境噪聲小、系統(tǒng)間串擾小等優(yōu)點。
[Abstract]:High-reso1ution Fiber-Optic Seismic system HR-FOSS is a new generation seismic wave detection system based on fiber-optic accelerometer array. High-precision real-time detection of oil and gas reservoir structure and migration. HR-FOSS technology will gradually replace the traditional technology as the supporting equipment for oil exploration and production. It is the trend and direction of petroleum exploration and production in the next few years. A small scale HR-FOSS prototype system is developed in this paper. In order to lay a technical and technological foundation for the development of commercial high-resolution optical oil and gas layer monitoring system in the future, except for the 64 geophone, the other technical requirements of small-scale HR-FOSS are basically the same as those of large-scale system. It includes six modules: multiwavelength laser light source module, optical modulation and demodulation module, optical sensing module, data processing module, system control computer and system power supply module. In this paper, the optical modulation and demodulation module and the optical sensing module are designed and fabricated, the discrete phase modulation and demodulation method and a kind of wavelength division time division hybrid multiplexing technique are studied, and the difference between the traditional petroleum data and the output data of the system is studied. A dynamic link library for data reading and writing is designed and written to standardize the data format. Three interference intensity signals are collected by discrete phase modulation and demodulation in this project. The phase change of the optical signal caused by the vibration signal is calculated. The phase of the beam is in good agreement with the vibration signal. In demultiplexing, the crosstalk of the system is reduced by time-delay staggered coupling. In the course of the project, 64 geophone and sensor network are tested. The test results show that the sensitivity of the geophone is 1028rad/ g @ 60Hz, the linearity is 0.997, the resonance frequency is 300Hz-350Hz, and the detection performance is not affected by the operating frequency. The field noise of the optical fiber sensing system is about 50ng / hm ~ (200) Hz, the crosstalk of time division multiplexing is less than -76dB, and the crosstalk of wavelength division multiplexing is less than -59dB.Experimental results show that the system can detect seismic waves. At the same time, it has the advantages of high detection sensitivity, low ambient noise and small crosstalk between systems.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP212

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