Hasegawa, Shutaro¹, Rasoul Sorkhabi², Shoji Iwanaga³, Naofumi Sakuyama¹, Othman Ali Mahumud⁴
(1) Idemitsu Oil and Gas Co, Tokoyo, Japan
(2) Energy and Geosciences Institute, Salt Lake City, UT
(3) Japan National Oil Corporation, Kanagawa, Japan
(4) Petronas, Kuala Lumpur, Malaysia

ABSTRACT: Fault Seal Analysis in the Temana Field, Offshore Sarawak, Malaysia

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. Five different algorithms, Shale Smear Factor (SSF), Smear Gouge Ratio (SGR), Clay Smear Potential (CSP), Shale Gouge Ratio (SGR), and Clay Content Ratio (CCR) were employed for the fault seal analysis, and cross-plots of these parameters boost the confidence level of the model results. SSF values of <6 and CCR values of >30% on the fault surface indicate across-fault sealing of the reservoir rock at sand-sand contacts. The fault seal appears to be strong enough to support the hydrocarbon columns filled down to the structural spill points of the reservoirs. Fault rock permeability calculated from the available calibrations of clay content-permeability relationship shows lower values of <0.3 millidarcy. Taking the Temana field as a case in point, a measure of fault rock permeability probability is proposed by the integration of clay content, fault displacement, and depth factors.

AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.