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The Effect of Slumping on Sandstone Distribution in the Arro Turbidites, Los Molinos Road, Spain

By
Pau Arbués
Pau Arbués
1
Grup de Geodinàmica í Anàlisi de Conques, Universitat de Barcelona, Barcelona, Spain
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Donatella Mellere
Donatella Mellere
2
A/S Norske Shell, Tananger, Norway
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Marta Puig
Marta Puig
3
BP Exploration Colombia, Bogotá, D.C. Colombia
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Mariano Marzo
Mariano Marzo
1
Grup de Geodinàmica í Anàlisi de Conques, Universitat de Barcelona, Barcelona, Spain
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Published:
January 01, 2008

Abstract

The Arro turbidites (Eocene San Vicente Formation) were deposited as part of the infill of the Ainsa basin during the foredeep stage of basin development. Their maximum thickness is 180 m (590 ft) with a preserved length of 16 km (10 mi) and width of 4 km (2.5 mi). Net-to-gross is approximately 40%. The Arro turbidites have been interpreted as a canyon-mouth sheet system that was deposited in a base-of-slope setting. The system is elongate with deposition occurring in the axis of the foredeep basin. Flanking the deposits was an active margin slope. The Arro turbidites have been correlated updip to a canyon fill that is incised in shelf deposits. The Los Molinos road outcrop is a partial section of the Arro turbidites. This section is 180 m (590 ft) long, transverse to the northwest-directed paleoflow. It is located approximately 4.2 km (2.6 mi) from the canyon-fill locality. Here, the Arro turbidites rest on top of a mudstone succession and reach their maximum thickness (180 m [590 ft]). Four classes of architectural elements, ranging in thickness from 1–20 m (3–66 ft), are present in the outcrop. These include 1) mudstone-rich, thin-bed elements (TM) with net-to-gross up to 30%, 2) sandstone-rich, thin-bed elements (TS), with variable net- to-gross (30–70%) and common erosive bedding, 3) thick-bed elements (C), mostly channel forms, with net-to-gross up to 90%, and 4) slump-deformed, mudstone-dominated units (SM). The lower interval of the studied succession (lower two-thirds of exposure) contains abundant slumps and thin beds. channel forms are rare, and where present,

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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