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Stratigraphic Architecture of a Channel Complex in the Midfan Setting of the Lower Pab Basin-floor Fan, North Baddho Dhora, Pakistan

By
T. Euzen
T. Euzen
IFP Technologies (Canada) Inc.
,
Calgary, Alberta, Canada
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R. Eschard
R. Eschard
Institut Français du Pétrole
,
Rueil-Malmaison, France
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E. Albouy
E. Albouy
Institut Français du Pétrole
,
Rueil-Malmaison, France
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Published:
January 01, 2008

Abstract

The outcrops are located in southern Pakistan in the southern part of the Pab mountain range, in a north-south-trending monocline more than 200 km (125 mi) long. In this area, the late Maastrichtian Pab Formation consists of turbidite and gravity-flow deposits in a lower-slope to basin setting. The Pab mountain belt is incised by dry river gullies, which provide excellent, large-scale 3-D exposures of the architecture of the Pab Formation. At the base of the Pab Formation outcrop belt, a sand-rich turbidite system is preserved from the canyon setting to the lobes of the basin-floor fan. This lower Pab Formation turbidite system consists of three vertically stacked channel complexes, organized in a backstepping succession, that onlap the paleomargin; each channel is >100 m (>330 ft) at its thickest point. The following pages describe the uppermost channel complex of the lower Pab Formation. This channel complex consists of several multi-story, individual channels that are stacked vertically or migrated laterally, depending on the local confinement. These channels have cut into sheet sands. The outcrop at the North Baddho gully location is interpreted as being in the midfan setting at a location approximately 10 km (6 mi) basinward of the canyon mouth. The vertical organization of the complex is overall backstepping. At the base of the complex, bypass facies dominate; fill and then spill deposits become dominant toward the top. During the erosional stage of the individual channels, bypass facies were deposited (mud-clast lags, thin-bedded drapes, and monogenic debris flows), while overflow deposits (levees and crevasse lobes)

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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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