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Stratigraphic Architecture of a Channel Complex in the Canyon-mouth Setting of the Lower Pab Basin-floor Fan, Drabber Dhora, Pakistan

By
E Albouy
E Albouy
Institut Français du Pétrole
,
Rueil-Malmaison, France
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R Deschamps
R Deschamps
Institut Français du Pétrole
,
Rueil-Malmaison, France
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T Euzen
T Euzen
Institut Français du Pétrole
,
Rueil-Malmaison, France
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R Eschard
R Eschard
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 onlapping the paleomargin, each one more than 100 m (330 ft) at its thickest point. The following pages describe the three stacked channel complexes in the Drabber Dhora outcrop, which is interpreted as being located at the canyon mouth of the lower Pab Formation turbiditic system. These channel complexes consist of several multistory, individual channels that are stacked vertically because of the confinement of the system. The vertical organization of the complex is overall backstepping. At the base of the complex, bypass facies dominate, whereas fill and then spill deposits become dominant towards the top. During the erosional stage of individual channels, bypass facies were deposited (mud-clast lags, tractive megadunes, gravel lags, and monogenic debris flows), while overflow deposits (levees) were deposited laterally to the channel axis. Overflow deposits are poorly developed in the canyon-mouth setting because of the confinement of the system.

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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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