LITMIR.BIZ

      1  Cover

      2  Series Page

      3  Title Page

      4  Copyright Page

      5  List of Contributors

      6  List of Reviewers

      7  Preface

      8  Part I: Distributed Acoustic Sensing (DAS)Concept, Principle, and Measurements 1 High Definition Seismic and Microseismic Data Acquisition Using Distributed and Engineered Fiber Optic Acoustic Sensors 1.1. DISTRIBUTED ACOUSTIC SENSOR (DAS) PRINCIPLES AND MEASUREMENTS 1.2. DAS SYSTEM PARAMETERS AND COMPARISON WITH GEOPHONES 1.3. DAS WITH PRECISION ENGINEERED FIBER ACKNOWLEDGMENTS REFERENCES TABLE OF VARIABLES 2 Important Aspects of Acquiring Distributed Acoustic Sensing (DAS) Data for Geoscientists 2.1. INTRODUCTION 2.2. FIBER‐OPTIC SENSOR 2.3. INTERROGATOR UNIT 2.4. ACQUISITION PARAMETER SELECTION 2.5. PREPROCESSING ISSUES 2.6. PROCESSING ISSUES 2.7. DATA QUALITY: DAS VS. GEOPHONE COMPARISONS 2.8. SUMMARY REFERENCES Chapter 3: Distributed Microstructured Optical Fiber (DMOF) Based Ultrahigh Sensitive Distributed Acoustic Sensing (DAS) for Borehole Seismic Surveys 3.1. INTRODUCTION 3.2. PRINCIPLES AND METHODS OF DMOF‐DAS 3.3. BOREHOLE SEISMIC SURVEY TESTS AND RESULTS 3.4. DISCUSSIONS 3.5. CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 4 Distributed Acoustic Sensing System Based on Phase‐Generated Carrier Demodulation Algorithm 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

      9  Part II: Distributed Acoustic Sensing (DAS) Applications in Oil and Gas, Geothermal, and Mining Industries 5 Field Trial of Distributed Acoustic Sensing in an Active Room‐and‐Pillar Mine 5.1. INTRODUCTION 5.2. EXPERIMENTAL METHODS 5.3. CABLE COUPLING COMPARISONS 5.4. DAS SENSITIVITY 5.5. LOCATING A SEISMIC SOURCE 5.6. SURFACE WAVE TRAVEL‐TIME TOMOGRAPHY 5.7. P‐WAVE DIFFERENTIAL TRAVEL‐TIME TOMOGRAPHY 5.8. DISCUSSION AND CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 6 On the Surmountable Limitations of Distributed Acoustic Sensing (DAS) Vertical Seismic Profiling (VSP) – Depth Calibration, Directionality, and Noise: Learnings From Field Trials 6.1. INTRODUCTION 6.2. DEPTH CALIBRATION 6.3. DIRECTIONALITY 6.4. NOISE 6.5. OVERCOMING THE FULL SUITE OF CHALLENGES – EXAMPLE FROM DEEP WATER 6.6. CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 7 Denoising Analysis and Processing Methods of Distributed Acoustic Sensing (DAS) Vertical Seismic Profiling (VSP) Data 7.1. INTRODUCTION 7.2. FIBER DEPLOYMENT TYPES AND NOISE SOURCES 7.3. CABLE RESONANCE REMOVAL 7.4. RANDOM NOISE SUPPRESSION 7.5. SNR ENHANCEMENT 7.6.

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