Estimation of near‐surface elastic parameters using multicomponent seismic data

Author:

Ata E. Z.1,Corrigan D.2,McMechan G. A.3,Gaiser J. E.4

Affiliation:

1. Center for Lithospheric Studies, The University of Texas at Dallas and Arco Oil and Gas Co.

2. ARCO Exploration and Production Technology, 2300 West Plano Parkway, Plano, TX 75075

3. Center for Lithospheric Studies, The University of Texas at Dallas, P. O. Box 830688, Richardson, TX 75083-0688

4. ARCO Oil and Gas Company

Abstract

In multicomponent seismic reflection surveys, surface and near‐surface effects can severely deteriorate the quality of reflection data. Such effects are more pronounced on shear‐wave than on compressional‐wave profiles. Amplitude anomalies, statics, and strong coherent source‐generated noise (i.e., surface waves) are often associated with inhomogeneous, poorly compacted near‐surface sediments of the weathering layer. The magnitude of such effects increases when sources and receivers are deployed at or near the surface in proximity to such inhomogeneities. Near‐surface effects can be investigated with respect to their depth of occurrence by burying seismic sources and/or receivers at various depths below the inhomogeneous weathering layer. In this context, an experiment was conducted to collect multicomponent seismic field data on a borehole‐controlled test site in east Texas. Data were recorded on three‐component surface and buried receivers using a full‐vector wavefield surface source. Although the geology appears simple, results of modeling one or two components of the field data with synthetics yields nonunique estimates of elastic parameters. Effects of anisotropy and heterogeneities are better identified and estimated with full‐wavefield surface and buried receiver observations. Single fold data from buried receivers yield reflection events with higher signal‐to‐noise ratio than 30‐fold CDP surface data previously acquired in the same area.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

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1. Historical S-wave applications and aspirations;SEG Technical Program Expanded Abstracts 2017;2017-08-17

2. References;3C Seismic and VSP: Converted waves and vector wavefield applications;2016-01-01

3. Shear wave velocity imaging of the Avignonet landslide (France) using ambient noise cross correlation;Journal of Geophysical Research;2010-09-11

4. Uma aplicação de sísmica de reflexão rasa multicomponente (3C) em área urbana;10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007;2007-11-23

5. Application of high-resolution seismic techniques in the evaluation of earthquake site response, Ottawa Valley, Canada;Tectonophysics;2003-06

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