Fault-seal Analysis in the Temana Field, Offshore Sarawak, Malaysia
Shutaro Hasegawa, Rasoul Sorkhabi, Shoji Iwanaga, Naofumi Sakuyama, Othman Ali Mahmud, 2005. "Fault-seal Analysis in the Temana Field, Offshore Sarawak, Malaysia", Faults, Fluid Flow, and Petroleum Traps, Rasoul Sorkhabi, Yoshihiro Tsuji
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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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Japan National Oil Corporation (JNOC) (presently Japan Oil, Gas and Metals National Corporation) launched a multidisciplinary and international project on the Evaluation of Traps and Seals in 1997. The project ended in 2003. This publication resulted from that project and includes JNOC research articles as well as contributions from industry and academia. The 17 papers in this volume cover topics such as a method to estimate the amount of oil/gas accumulation using the concept of equivalent grain size in seal rock, and oil/gas migration to and spill-point geometry of petroleum traps; two case studies of fault seal assessment applied to normal faults in Tertiary clastic reservoirs in offshore Sarawak and offshore Gulf of Thailand; and physical analog studies of the development of extensional faults. This publication also contains a valuable bibliography of nearly 1000 additional articles and books published on fault traps, fault seal processes, and fault-related fluid flow in sedimentary basins, for use as a reference tool to delve into publications preceding this volume.