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Abstract

AAPG Methods in Exploration No. 14, Chapter 11: Interpreting Natural Fracture Directions in Horizontal Wells from Wellbore Image Logs , by O. Jorgensen and N. W. Petersen , Pages 173 - 182
from:
AAPG Methods in Exploration No. 14: Horizontal Wells: Focus on the Reservoir, Edited by T. R. Carr, E. P. Mason, and C. T. Feazel
Copyright copyrght.jpg (4253 bytes)2003 by The American Association of Petroleum Geologists. All rights reserved.

Chapter 11
Interpreting Natural Fracture Directions in Horizontal Wells from Wellbore Image Logs

O. J248_o.jpg (433 bytes)rgensen
N. W. Petersen
M230_ae.jpg (3841 bytes)rsk Olie og Gas AS
Copenhagen, Denmark

ABSTRACT

A method is presented to discriminate on wellbore image logs natural Previous HitopenNext Hit fractures from far more abundant drilling-induced fractures in horizontal wells in the Dan chalk field, offshore Denmark. The method recognizes that drilling-induced fractures are predominantly shear failures in a preferred orientation relative to the wellbore, whereas natural fractures are confined to a limited strike range determined by the regional stress field.

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