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AAPG Bulletin

Abstract

AAPG Bulletin, V. 95, No. 4 (April 2011), P. 537-558.

Copyright copy2011. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/08181010035

Drilling conditions making wells unsuitable for fluid inclusion studies on drill cuttings

Sverre Ekrene Ohm,1 Helen Haneferd2

1ConocoPhillips Norge, Exploration Department, P.O. Box 3, N-4064 Stavanger, Norway; [email protected]
2ConocoPhillips Norge, P.O. Box 3, N-4064 Stavanger, Norway

ABSTRACT

A fluid inclusion study conducted on a well in the northern North Sea showed a remarkable correlation between fluid inclusion stratigraphy responses and depths of drilling bit changes. Further investigation of the well data suggested that extreme temperatures occasionally had been generated at the bit-sediment interface during drilling. Cracking of larger organic molecules to an abundance of smaller ones and trapping of these in inclusions formed by supercooling of partly melted sediment explain the correlation. Not all wells are consequently suitable for fluid inclusion screening analyses. Thus, before initiating fluid inclusion studies, wells that have experienced intense heat during drilling should be identified and avoided.

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