Evaluation of Horner plot-corrected log-derived temperatures in the Danish Central Graben, North Sea

Authors: Waples, Douglas¹; Pedersen, May²

Source: Natural Resources Research, Volume 13, Number 4, December 2004 , pp. 223-227(5)

Publisher: Springer

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Abstract:

A small dataset comprising all temperature available data from reliable Horner plots from the Danish Central Graben was examined. Temperatures obtained by extrapolation using standard Horner plots were determined to be lower than “true” formation temperatures, as interpreted from DST data. Excellent agreement between “true” formation temperatures and Horner plot temperatures was achieved when the Horner plot temperatures (T_HP) were corrected upward by an amount proportional to the slope (A) of the Horner plot using the equation <IMG SRC="http://images.ingentaselect.com/absimages/klu/15207439/klu_narr_2004_13_4_9130h.1.gif" ALT="$\hspace*{120pt}T_{\rm true} = T_{\rm HP} + 26\cdot \exp(-0.0052\,{\it A}) $" TEXT="a mathematical formula"> where the temperatures and the slope are in degrees Celsius. The standard deviation of the error in the corrected Horner plot temperatures was 2.1°C, indicating that this method is consistent. Further studies using larger numbers of Horner plots from a variety of geographic areas should be carried out to test and refine the hypotheses presented here. Efforts also should be made to understand the causes of variability in slopes of Horner plots.

Keywords: Temperature correction; log temperatures; Horner plot

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11053-004-0130-9

Affiliations: 1: Consultant, Evergreen, Colorado, Email: dwwaples@cs.com 2: Maersk Olie og Gas AS, Copenhagen K, Denmark,

Publication date: 2004-12-01