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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Maddock, R., and R. Ravnas,
DOI:10.1306/13181281M923407
2010 by The American Association of Petroleum Geologists.
Applications of Oil-base Mud Earth Imager for a High-temperature and High-pressure Exploration Well
Robert Maddock,1 Rodmar Ravnas2
1Baker Hughes, Stoneywood Park North, Aberdeen, United Kingdom
2Norske Shell A/S, Tananger, Norway
ACKNOWLEDGMENTS
We are grateful to Baker Hughes and Norske Shell A/S for the permission to publish these data. We also thank Femi Adegbola, Mark Lawrence, Vince Hilton, and Caroline Glass for their critical review at various stages of the work, as well as one anonymous reviewer. Finally, we would like to thank Michael Poppelreiter for his continued support that provided the impetus to complete this manuscript.
ABSTRACT
An exploration well was drilled as a wildcat targeting high-pressure and high-temperature gas condensates within Jurassic-age reservoir sandstones offshore Norway. The well, drilled to a depth of more than 5000 m (16,404 ft) subsea with bottom-hole temperatures up to 176
C and mud pressures up to 93 MPa, was successfully tested. As part of a comprehensive logging and coring program, oil-base mud EARTH ImagerSM, Baker Hughes/Baker Atlas data were acquired in the discovery well. The objectives of the wellbore imaging were to determine the structural dip, confirm the presence or absence of (seismic and subseismic) faults, support detailed core sedimentology studies, and determine the orientations of depositional or architectural elements. This contribution summarizes the acquisition and interpretation of the borehole images. Structural dip and an apparent low density of faulting interpreted from the images were consistent with the predrill structural interpretation. Comparison of the core and images assisted in the characterization and orientation of the depositional architecture.
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