Extracting near surface information from complex regional seismic data with thick limestone and sand dunes at the near surface  

Authors / CoAuthors

Holzschuh, J.

Abstract

Near surface information can be obtained from regional seismic data showing the weathering and layering properties, as well as dipping bedrock structures. Hard limestone layers in the near surface overlying soft sediments make complex refracted arrivals and refraction statics are difficult to define and in some cases it is best not to apply refraction statics to the reflection data. For some of the data in this survey surface sand dunes over 10 m high caused significant time delays for reflected data and refraction statics were essential prior to further reflection processing. Numerous refraction models were produced and tested along the data. Refraction models provided useful information about layering in the near surface, and helped with the seismic processing. The refractor models also indicated the possible presence of ground water. In some places the refracted arrivals changed polarity indicating either change in thickness or hardness of the limestone at the near surface overlying slower unconsolidated sediments. These regions sometimes correlated with diminished reflections. Dip moveout (DMO) correction was essential to improve near surface steep dipping structures.

Product Type

nonGeographicDataset

eCat Id

83095

Contact for the resource

Keywords

• External PublicationConference Paper

( Theme )

• seismic reflection

( Theme )

• seismic refraction

( Theme )

• karst

( Theme )

• sedimentary basins

• WA and SA

Australian and New Zealand Standard Research Classification (ANZSRC)

• Seismology and Seismic Exploration

• Published_Internal

Publication Date

2015-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

Maintenance Information

notPlanned

Topic Category

geoscientificInformation

Series Information

Lineage

Conference extended abstract from ongoing project work

Parent Information

Extents

Reference System

Spatial Resolution

Service Information

Associations

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Source Information

The source data is Line 13GA-GE1 seismic dataset from Geoscience Australia, Geological Survey of Western Australia and the Department of State Development, South Australia. Seismic SEGY data and internal processing