Active Geophysical Monitoring

CHAPTER 9

ACQUISITION OF CROSSWELL SEISMIC MONITORING DATA

Thomas M. Daley^a, Fenglin Niu^b, Paul G. Silver^c, and Ernest L. Majer^a

Contents

1. Introduction

2. Optimal Acquisition Parameters

3. Acquisition Hardware

4. Field Tests

5. Conclusions

Acknowledgments

References

1. INTRODUCTION

Seismic velocity (both compressional and shear) is a fundamental property of materials, a property that varies with changes in conditions both external (stress, temperature) and internal (fluid saturation, crack density). Monitoring of changes in these external or internal conditions is a goal of geophysical investigations such as earthquake prediction (via stress change monitoring) and reservoir exploitation (via fluid saturation monitoring). Using an active source ...