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AAPG Bulletin, V. 86, No. 10 (October 2002),Copyright ©2002. The American Association of Petroleum Geologists. All rights reserved.

Acoustic impedance interpretation for sand distribution adjacent to a rift boundary fault, Suphan Buri basin, Thailand

S. Ronghe,1 K. Surarat2

1Department of Petroleum Geoscience, University Brunei Darussalam, Jalan Tungku Link, Brunei Darussalam, BE 1410; email: [email protected]
2Department of Petroleum Geoscience, University Brunei Darussalam, Jalan Tungku Link, Brunei Darussalam, BE 1410; current address: PTT Exploration and Production Public Co. Ltd., 555 Vibhavadi-Rangsit Road, Bangkok, 10900, Thailand; email: [email protected]


Sagar Ronghe received his B.Sc. degree in geological oceanography from the University College of North Wales, Bangor, United Kingdom, in 1991. He obtained an M.Sc. degree (distinction) in petroleum geoscience in 1992 and a Ph.D. in 1996, both from the University of Aberdeen, United Kingdom. Sagar is a geophysicist, employed as a lecturer with the Department of Petroleum Geoscience, University Brunei Darussalam. His interests are in integrating seismic and wire-line data for predicting lithology, reservoir properties, and fluid distributions through seismic inverse modeling and geostatistics.

Korakot Surarat received her B.Sc. degree in geology from Chulalongkorn University, Thailand, in 1993 and her M.Sc. degree in petroleum geoscience from University Brunei Darussalam in 1999. She worked as a data processor for Unocal Thailand between 1993 and 1996. Korakot joined PTT Exploration and Production Public Co. Ltd. in 1996 as a geophysicist, and she is currently with the Arthit Asset Team. Her interests are in reservoir characterization.


We would like to thank PTT Exploration and Production Public Co. Ltd. for provision of data and for permission to publish the results. Jason Geosystems and Landmark Graphic Corporation are thanked for donation of software to the Department of Petroleum Geoscience, University Brunei Darussalam (UBD). This article benefited considerably from reviews by J. Lambiase and C. Morley (UBD), M. Sams (Jason Geosystems), and J. E. Blott, B. Hart, and L. Liro (AAPG nominated reviewers).


A seismic-derived acoustic impedance volume was used to image the locations and shapes of water-saturated sands deposited within the producing interval of a continental half graben. Wire-line log crossplots showed that high values of impedance relate to sand lithology. Constrained sparse spike inversion resulted in good comparisons between the derived impedance traces and band-filtered wire-line impedances. Maximum impedance extractions in map view and three-dimensional (3-D) displays revealed two styles of sand distribution: axial deposits comprising delta lobes and boundary fault-induced deposits comprising fan deltas and sand-filled feeder canyons. Coarse-grained sedimentation was dictated by the structural configuration of the basin. Axial sedimentation prograded from south to north, plunging into the basin. Boundary-fault influence on sedimentation was controlled by a transfer zone and relay ramp geometry between en echelon fault segments and showed two component pathways: fan deltas were transported perpendicular to the fault, whereas feeder canyons transported sediment downslope to interfinger with the rift-floor deposits. These styles of structure and sedimentation support previously published models of structural-sedimentation interactions in rifts.

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