Thin-skinned thrust-fault complex in the Phu Quoc Basin, SW Vietnam

Emil Bach Madsen, Lars Ole Boldreel, Stig Schack Pedersen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

Abstract

The Phu Quoc Basin is a Late Jurassic to Early Cretaceous foreland basin located SW of Vietnam in the eastern part of the Gulf of Thailand. A structural model for the basin is provided based on the interpretation of a commercial 2 D digital multichannel reflection seismic survey in a rectangular open grid with an approximate distance between the lines of 8 km. The survey consists of 29 profiles totalling about 1500 km with a range of 7 sec TWT depth. The aim of this investigation is to present a structural model for a virgin area, which has not been subjected to exploration drilling. For any future investigation of the potential of this basin it is of crucial importance to know the structural framework, without which all further investigations will be waste of investments. The deformation of the Phu Quoc Basin took place during the orogenic build-up of the Kampot Fold Belt (Fyhn et al. 2010) in the early to middle Cretaceous, which resulted in the formation of a thin-skinned thrust-fault complex. The main thrust fault elements are flats and ramps. In the distal part of the complex piggyback basins occur with a translation of more than 3 km. The main part of the complex is concealed under Neogene marine deposits. The magnitude of displacement of thrust sheets with an average thickness of 300 m varies from 3 to 8 km. The number of ramps increases towards the proximal part of the complex, and an increasing number of hanging-wall anticlines occur, some of which developed into antiformal stacks. Duplex structures initially lifted the top of the tectonic complex to a higher level, which resulted in a deeper level of erosion into the tectono-stratigraphic units. An example of this is the Hon Mau island in the Nam Du archipelago, where the thrust deformation elevated Permian pyroclastic rhyolites up to a surface-near position. The thin-skinned thrust-fault model is based on a detailed balanced cross-section analysis. The structural information can be provided for future investigations of the Phu Quoc Basin, either commercial or scientific.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - International Petroleum Technology Conference 2012, IPTC 2012
PublisherInternational Petroleum Technology Conference
Pages1409-1416
Number of pages8
ISBN (Print)978-1-61399-148-0
DOIs
Publication statusPublished - 15 Nov 2012
EventInternational Petroleum Technology Conference 2012, IPTC 2012 - Bangkok, Thailand
Duration: 7 Feb 20129 Feb 2012

Conference

ConferenceInternational Petroleum Technology Conference 2012, IPTC 2012
Country/TerritoryThailand
CityBangkok
Period7/02/129/02/12

Programme Area

  • Programme Area 3: Energy Resources
  • Programme Area 5: Nature and Climate

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