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Chapter 19: Integrated Hydrostratigraphic Interpretation of 3D Seismic-reflection and Multifold Pseudo-3D GPR Data

By
John H. Bradford
John H. Bradford
Center for Geophysical Investigation of the Shallow Subsurface, Boise State University, Boise, Idaho, U.S.A. E-mail johnb@cgiss.boisestate.edu
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Published:
January 01, 2010

Abstract

To map the 3D distribution of major hydrologic boundaries in a shallow aquifer near Boise, Idaho, 3D seismicreflection data and multifold, pseudo-3D ground-penetrating-radar (GPR) data were analyzed. The seismic data covered a 75- × 70-m area and imaged horizons from 18 to 150 m deep. The 10-fold, 50-MHz GPR data were acquired on a 20- × 30-m grid using a multichannel GPR system and offsets ranging from 2 m to 20 m. By correlating the well-resolved GPR depth image with a clayaquitard seismic reflection, the seismic-velocity model was improved substantially and the accuracy of the final interpretation was improved. The resulting clay-aquitard surface differed by 0.12 ± 0.46 m from the depth to clay measured in wells. By integrating the interpretations of the GPR and seismic data, a 3D map of major hydrostratigraphic boundaries was produced.

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Contents

Geophysical Developments Series

Advances in Near-surface Seismology and Ground-penetrating Radar

Society of Exploration Geophysicists
Volume
15
ISBN electronic:
9781560802259
Publication date:
January 01, 2010

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