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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2007. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/06280707014
Degradation of a footwall
fault
block with hanging-wall
fault
propagation in a continental-lacustrine setting: How a new structural model impacted field development plans, the Sirikit field, Thailand




Christopher K. Morley,1 Yarick Ionnikoff,2 Nantavan Pinyochon,3 Krongpol Seusutthiya4
1PTT Exploration and Production
, 555 Vibhavadi-Rangsit Road, Chatuchak, Bangkok 10900, Thailand; chrissmorley@gmail.com
2PTT Exploration and Production
Siam Ltd., 10 Soonthornkosa Road, Bangkok 10110, Thailand
3PTT Exploration and Production
Siam Ltd., 10 Soonthornkosa Road, Bangkok 10110, Thailand
4PTT Exploration and Production
Siam Ltd., 10 Soonthornkosa Road, Bangkok 10110, Thailand
ABSTRACT
The Sirikit field is a large field developed in a complex tilted fault
block. The relatively simple stratigraphy on the tilted
fault
block flank becomes difficult to trace onto the tilted
fault
block crest. A recent reinterpretation of the reprocessed three dimensional seismic reflection data revealed that the difficulties of correlating reservoirs toward the crest are caused by features associated with degradation of the footwall, particularly (1) the prevalence of low-angle detachment faulting and (2) the development of discordant stratigraphic sections resulting from multiple episodes of erosion at the tilted
fault
block crest, followed by the eastward onlap of the section onto the eroded footwall surface. The main characteristic of this structure is the preservation of the onlapping sections through periodic propagation of the main bounding
fault
toward the hanging wall, which resulted in the accretion of former hanging-wall rocks to the footwall. This propagation sequence appears to be atypical for most degraded footwalls described in the literature. The degraded footwall model replaced earlier splaying bounding
fault
models used for development planning. Implementing this new structural model opened up new appraisal opportunities as the compartmentalization and reservoir distribution pictures changed. Appraisal of the reservoir now present above the hydrocarbon-water contacts following the new structural model led to a 15% increase in recoverable hydrocarbon volumes.
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