F. Lafont, J.-C. Lacharpagne, B. Euvrard, A. Lejay, and D. Lawrence

TotalFinaElf, Pau, France

ABSTRACT: Porosity Preservation in Deeply Buried Chlorite-Coated Sandstones of the Norwegian Sea: Understanding Early Diagenetic Processes in a High Resolution Sequence Stratigraphic Framework

This paper presents part of the results of a sedimentological and diagenetic synthesis carried out by TotalfinaElf on the Lower to Mid-Jurassic series of the Halten Banken Area (Norwegian Sea). The main goal was a detailed understanding of the distribution, both stratigraphic and geographic, of high porosity reservoirs preserved at high burial depths (between 4000 and 5000 m) in a high temperature - high pressure setting. It was based on the integration of 70 wells, including examination of more than 4000 m of core, calibrated by numerous thin sections and SEM observations which showed that the intervals with best preserved porosity were characterised by thick chlorite coatings around quartz grains.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado