About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Houston Geological Society Bulletin


Houston Geological Society Bulletin, Volume 34, No. 3, November 1991. Pages 13-13.

Abstract: A Quantitative Approach to Mapping: Previous HitVerticalNext Hit Separation versus Throw


Daniel J. Tearpock

Perhaps the most costly subsurface mapping errors made by industry today are to use throw instead of Previous HitverticalNext Hit separation to contour across faults. Indeed the two terms are often confused or used interchangeably, i.e. Previous HitverticalNext Hit separation is often called throw and throw is substituted for Previous HitverticalNext Hit separation. These two terms are, however, not the same and are a measure of two distinctly different geometric properties. In this talk, we demonstrate that to contour throw across faults (normal or reverse) instead of Previous HitverticalNext Hit separation can typically (commonly) result in mapping errors on the order of 25% or greater. New equations have been derived and nomograms generated which provide quantitative guidelines to construct structure maps in faulted areas. We define the fault components applicable to subsurface mapping, present the quantitative relationship of Previous HitverticalNext Hit separation to throw, introduce the correct technique to contour Previous HitverticalNext Hit separation across a fault (using Previous HitseismicNext Hit data and well logs), and discuss the analysis of errors caused by mapping throw in place of Previous HitverticalTop separation.

End_of_Record - Last_Page 13---------------


Copyright © 2005 by Houston Geological Society. All rights reserved.