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Fault-seal Analysis Applied to the Erawan Gas-condensate Field in the Gulf of Thailand

By
Tokio Kachi
Tokio Kachi
Mitsui Oil Exploration Co., Ltd. (MOECO),Tokyo, Japan
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Hideki Yamada
Hideki Yamada
Mitsui Oil Exploration Co., Ltd. (MOECO),Tokyo, Japan
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Kiyoshi Yasuhara
Kiyoshi Yasuhara
Mitsui Oil Exploration Co., Ltd. (MOECO),Tokyo, Japan
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Masamichi Fujimoto
Masamichi Fujimoto
Mitsui Oil Exploration Co., Ltd. (MOECO),Tokyo, JapanTechnology Research Center, Japan National Oil Corporation, Chiba, Japan
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Shutaro Hasegawa
Shutaro Hasegawa
Mitsui Oil Exploration Co., Ltd. (MOECO),Tokyo, JapanTechnology Research Center, Japan National Oil Corporation, Chiba, Japan
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Shoji Iwanaga
Shoji Iwanaga
Mitsui Oil Exploration Co., Ltd. (MOECO),Tokyo, JapanTechnology Research Center, Japan National Oil Corporation, Chiba, Japan
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Rasoul Sorkhabi
Rasoul Sorkhabi
Technology Research Center, Japan National Oil Corporation, Chiba, JapanTechnology Research Center, Japan National Oil Corporation, Chiba, Japan
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Published:
January 01, 2005

Abstract

The Erawan field in the Gulf of Thailand is characterized by a series of east- and west-dipping normal faults displacing the Miocene clastic reservoirs. The fault-seal capacity of these faults was assessed using sand-shale juxtaposition diagrams, shale smear parameters, and fault-seal failure probability (FSFP) (based on in-situ stress conditions). For this study, five east-dipping faults in the Erawan N Platform area were selected (faults E-16, E-17, E-18, E-20, and E-27). Several deviated wells have been drilled through the footwall blocks of these faults. Low values of the shale smear factor (SSF <6) and high values of the clay content ratio (CCR >30%) of four of the faults suggest that faults seal along their planes. In contrast to these four faults, fault E-27 appears to act as an across-fault conduit for some intervals and seal in others. Intervals without trapped hydrocarbons have higher SSF values, suggesting that the fault leaks locally. These five faults trap 15 gas pay zones. Eight of the pay zones have sand-shale juxtaposition across the faults, which may explain 8 of the 15 accumulations. Shale smear parameters can account for all 15 accumulations. Fault-seal failure probability was derived for one of these faults (E-16) by integrating the CCR values and the probability of fault slip tendency and fault dilation tendency under the current stress regime in the Erawan field. Low FSFP values indicate that the fault seals do not appear to have been breached given the in-situ stress field acting on the normal fault.

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Contents

AAPG Memoir

Faults, Fluid Flow, and Petroleum Traps

Rasoul Sorkhabi
Rasoul Sorkhabi
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Yoshihiro Tsuji
Yoshihiro Tsuji
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American Association of Petroleum Geologists
Volume
85
ISBN electronic:
9781629810065
Publication date:
January 01, 2005

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