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Book Chapter

Characterization of Fault-Related Dolomite Bodies in Carbonate Reservoirs Using Lidar Scanning

By
Juliette Lamarche
Juliette Lamarche
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Jean Borgomano
Jean Borgomano
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Bruno Caline
Bruno Caline
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Franck Gisquet
Franck Gisquet
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Sylvain Rigaud
Sylvain Rigaud
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Stefan Schröder
Stefan Schröder
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Sophie Viseur
Sophie Viseur
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Published:
January 01, 2011

Abstract

Fault-related dolomite subsurface reservoirs are formed from fluid circulation that results in significant transformation of the reservoir properties. The geometry and internal organization of such dolomitic reservoirs remain difficult to image with seismics alone. A multi-scale approach is essential to understand and predict the diagenetic processes that control the exact 3D morphology of the dolomite with spatial precision and true dimensions, and consequently the reservoir properties. In this context, we propose an analytical workflow including field work, LIDAR scanning and numerical geology applied to dolomite outcrops in Mesozoic carbonates (SE France). The exposed dolomite-limestone contact exhibits sinuous, irregular and convolute shapes, which are either fault-parallel, bedding-parallel or chaotic. To characterize this complex distribution, we performed LIDAR scanning on 500 m x 150 m cliffs and road cuts with 4.5 cm to 1–1.5 cm average point spacing. The cloud is composed of 22 millions points comprising X, Y, Z, intensity, red, green, and blue attributes. Digitization of the limestone-dolomite boundary was performed in RiscanPro and GOCAD environments, for extracting the true 3D geometry of the dolomite body for further geostatistical and 3D facies modelling. This approach captures the large-scale geometry of the dolomite bodies. However, single RGB or intensity properties do not unequivocally reproduce small-scale (below ∼ 1 m) heterogeneities of the late diagenetic dolomite. Color changes induced by weathering or climatic conditions are of the same size range as the small-scale heterogeneities, thus they are not unique to allow automated tracking on the point set. As a result, the workflow remains time-consuming, and further work is needed to allow calibration of the LIDAR data points with mineralogy.

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Contents

SEPM Concepts in Sedimentology and Paleontology

Outcrops Revitalized: Tools, Techniques and Applications

Ole J. Martinsen
Ole J. Martinsen
Statoil Exploration
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Andrew J. Pulham
Andrew J. Pulham
ESACT
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Peter D.W. Haughton
Peter D.W. Haughton
University College Dublin
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Morgan D. Sullivan
Morgan D. Sullivan
Chevron Energy Technology Company
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SEPM Society for Sedimentary Geology
Volume
10
ISBN electronic:
9781565763067
Publication date:
January 01, 2011

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