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Abstract

R. Sorkhabi and Y. Tsuji, 2005, Faults, fluid flow, and petroleum traps: AAPG Memoir 85, p. 43-58.

DOI:10.1306/1033715M853128

Copyright copy2005 by The American Association of Petroleum Geologists.

Fault-seal Analysis in the Temana Field, Offshore Sarawak, Malaysia

Shutaro Hasegawa,1 Rasoul Sorkhabi,2 Shoji Iwanaga,3 Naofumi Sakuyama,4 Othman Ali Mahmud5

1Technology Research Center, Japan National Oil Corporation, Chiba, Japan; Present address: Idemitsu Oil amp Gas Co., Tokyo, Japan.
2Technology Research Center, Japan National Oil Corporation, Chiba, Japan; Present address: Energy amp Geoscience Institute, University of Utah, Salt Lake City, Utah, U.S.A.
3Technology Research Center, Japan National Oil Corporation, Chiba, Japan; Present address: Geoscience Research Laboratory, Yamato, Kanagawa, Japan.
4Technology Research Center, Japan National Oil Corporation, Chiba, Japan; Present address: Idemitsu Oil amp Gas Co., Tokyo, Japan.
5Petroleum Management Unit, Petroliam Nasional Berhad, Kuala Lumpur, Malaysia; Present address: Petronas Carigali, Kuala Lumpur, Malaysia.

ACKNOWLEDGMENTS

This study was jointly supported by the Japan National Oil Corporation (JNOC) and the Petroliam Nasional Berhad (PETRONAS). The authors express their gratitude to the management of both organizations for permission to publish this chapter, to K. Nakayama of Japex Geophysical Institute (JGI)-Tokyo and Mazlan Madon of PETRONAS for reviewing the chapter, and Y. Tsuji of JNOC and David Curtis of the University of Utah for reading the manuscript and for their informative comments.

ABSTRACT

The Temana field is located on a structural high in the Balingian province, offshore Sarawak, Malaysia. Fault-sealing assessment of a normal fault in the Tertiary clastic rocks of the Temana field was carried out using shale smear parameters. Shale smear factor values of less than 6 and clay content ratio of greater than 30% on the fault surface indicate across-fault sealing of the reservoir rocks on sand-sand interfaces. Hydrocarbon column height estimated for sandstone pay zones from across-fault pressure difference is comparable to that calculated from the structural spillpoint (76 m; 249 ft). The fault seal thus appears to be efficient enough to support hydrocarbon columns filled down to the structural spillpoints of the reservoirs. Fault-rock permeability calculated from the available calibrations of the clay content-permeability relationship shows lower permeabilities of less than 0.3 md. Taking the Temana fault as a case in point, a new approach to evaluate fault-rock permeability probability (based on integration of clay content, fault displacement, and depth factors) is presented.

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