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Distributed Acoustic Sensing in Geophysics
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Страница 1
Table of Contents
List of Tables
List of Illustrations
Guide
Pages
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1 High Definition Seismic and Microseismic Data Acquisition Using Distributed and Engineered Fiber Optic Acoustic Sensors
ABSTRACT
1.1. DISTRIBUTED ACOUSTIC SENSOR (DAS) PRINCIPLES AND MEASUREMENTS
1.1.1. DAS Concept
1.1.2. DAS Interferometric Optical Response
1.1.3. DAS Optical Phase Recovery
1.1.4. DAS Dynamic Range Algorithms
1.1.5. DAS Signal Processing and Denoising
1.1.6. Time Integration of DAS Signal
1.2. DAS SYSTEM PARAMETERS AND COMPARISON WITH GEOPHONES
1.2.1. DAS Optimization for Seismic Applications
1.2.2. DAS Directionality in Seismic Measurements
1.2.3. DAS Field Data Examples
1.3. DAS WITH PRECISION ENGINEERED FIBER
1.3.1. Precision engineered fiber concept
1.3.2. Sensitivity and Dynamic Range
1.3.3. Field Trial Results
ACKNOWLEDGMENTS
REFERENCES
TABLE OF VARIABLES
2 Important Aspects of Acquiring Distributed Acoustic Sensing (DAS) Data for Geoscientists
ABSTRACT
2.1. INTRODUCTION
2.2. FIBER‐OPTIC SENSOR 2.2.1. Sensing from Backscattered Light
2.2.2. Single vs. Multi‐mode Fiber
2.2.3. Deploying Fiber
2.2.4. Handling Fiber‐Optic Cables
2.3. INTERROGATOR UNIT 2.3.1. Types of Interrogators
2.3.2. Synchronizing Source Information and Time Stamps
2.4. ACQUISITION PARAMETER SELECTION 2.4.1. Gauge Length
2.4.2. Sampling Rate
2.4.3 Pulse Width
2.5. PREPROCESSING ISSUES 2.5.1. Fading
2.5.2. Common‐Mode Noise
2.5.3. Spatial Calibration of Channels
2.6. PROCESSING ISSUES 2.6.1. Angle of Incidence
2.6.2. Single Component vs. Three Components
2.7. DATA QUALITY: DAS VS. GEOPHONE COMPARISONS 2.7.1. Lower Intrinsic SNR and Higher Channel Density
2.7.2. Strain, Strain Rate, and Particle Velocity
2.8. SUMMARY
REFERENCES
Chapter 3 Distributed Microstructured Optical Fiber (DMOF) Based Ultrahigh Sensitive Distributed Acoustic Sensing (DAS) for Borehole Seismic Surveys
ABSTRACT
3.1. INTRODUCTION
3.2. PRINCIPLES AND METHODS OF DMOF‐DAS 3.2.1. Principles of DAS Using Optical Fiber
3.2.2. Concept and Characteristics of DMOF
3.2.3. Fabrication and Performance Test of DMOF
3.2.4. System Configuration and Working Principle of the DMOF‐DAS
3.2.5. Performance of the DMOF‐DAS
3.3. BOREHOLE SEISMIC SURVEY TESTS AND RESULTS 3.3.1. Zero‐Offset VSP Survey in Fushan Oil Field
3.3.2. Walkaway VSP Survey in Suning Oil Field
3.4. DISCUSSIONS
3.5. CONCLUSIONS
ACKNOWLEDGMENTS
REFERENCES
4 Distributed Acoustic Sensing System Based on Phase‐Generated Carrier Demodulation Algorithm
ABSTRACT
4.1. INTRODUCTION
4.2. PRINCIPLE
4.3. EXPERIMENTS AND RESULTS
4.4. FIELD TRIAL OF NEAR‐SURFACE SEISMIC EXPERIMENT WITH PGC‐DAS SYSTEM
4.5. CONCLUSIONS
ACKNOWLEDGMENTS
REFERENCES
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