Sequence Stratigraphic Correlation of the Tor Field

Abstract

A new sequence stratigraphic correlation of the Tor Field has been created in this MScthesis.The lithostratigraphic correlation currently used by the Tor Field operator ConocoPhillipsfor reservoir characterization, has been criticized by Total E&P Norge because: (a) it ismainly based on the porosity curve derived from wireline logs (b) it displays randomthickness variations, which can not be explained with faults visible on seismic.The presented correlation of the Tor Field is based on the principle of sequence strati-graphic correlation. Six Tor Field wells were previously correlated as a part of a regionalstudy by Gennaro et al. (2011) and became the principle reference for the new correlation.Other previous correlations of the Tor Field were also reviewed and considered. The newcorrelation used composite logs instead of just the derived porosity log. In addition, abiostratigraphic study of two Tor Field wells by Lottaroli and Catrullo (2000) was includedto support the new correlation.The new correlation proved to be more uniform in terms of interval thickness and theremaining thickness changes could be better explained, compared to the lithostratigraphiccorrelation. The interval thickness trends that are found in new correlation are moreconsistent than earlier. A repeated section in well 2/5-2 was identied with the helpof the biostratigraphy from Lottaroli and Catrullo (2000) and the aected markers weremodied.This new sequence stratigraphic correlation will be tested by Total E&P Norge in arevision of their reservoir characterization model and dynamic simulation model.