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Book Chapter

Interpreting Natural Fracture Directions in Horizontal Wells from Wellbore Image Logs

By
O. Jørgensen
O. Jørgensen
Mærsk Olie og Gas AS Copenhagen, Denmark
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N. W. Petersen
N. W. Petersen
Mærsk Olie og Gas AS Copenhagen, Denmark
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Published:
January 01, 2003

Abstract

A method is presented to discriminate on wellbore image logs natural open 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.

The strike of natural fractures derived from the image logs agrees well with core analyses and with the strike of hydraulic fractures generated during injection and stimulation. Valuable information on likely injection fracture propagation direction can thus be derived.

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Contents

AAPG Methods in Exploration Series

Horizontal Wells: Focus on the Reservoir

Timothy R. Carr
Timothy R. Carr
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Erik P. Mason
Erik P. Mason
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Charles T. Feazel
Charles T. Feazel
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American Association of Petroleum Geologists
Volume
14
ISBN electronic:
9781629810553
Publication date:
January 01, 2003

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