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Geological Society, London, Special Publications; 2007; v. 292; p. 1-24;
DOI: 10.1144/SP292.1
© 2007 Geological Society of London

Articles

Structurally complex reservoirs: an introduction

S. J. Jolley1, D. Barr2, J. J. Walsh3 & R. J. Knipe4

1 Shell UK Limited, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK (e-mail: steve.jolley{at}shell.com)
2 BP Exploration, Burnside Drive, Farburn Industrial Estate, Dyce, Aberdeen AB21 7PB, UK
3 Fault Analysis Group, School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland
4 Rock Deformation Research Ltd, School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK

Structurally complex reservoirs form a distinct class of reservoir, in which fault arrays and fracture networks, in particular, exert an over-riding control on petroleum trapping and production behaviour. With modern exploration and production portfolios commonly held in geologically complex settings, there is an increasing technical challenge to find new prospects and to extract remaining hydrocarbons from these more structurally complex reservoirs. Improved analytical and modelling techniques will enhance our ability to locate connected hydrocarbon volumes and unswept sections of reservoir, and thus help optimize field development, production rates and ultimate recovery. This volume reviews our current understanding and ability to model the complex distribution and behaviour of fault and fracture networks, highlighting their fluid compartmentalizing effects and storage-transmissivity characteristics, and outlining approaches for predicting the dynamic fluid flow and geomechanical behaviour of structurally complex reservoirs. This introductory paper provides an overview of the research status on structurally complex reservoirs and aims to create a context for the collection of papers presented in this volume and, in doing so, an entry point for the reader into the subject. We have focused on the recent progress and outstanding issues in the areas of: (i) structural complexity and fault geometry; (ii) the detection and prediction of faults and fractures; (iii) the compartmentalizing effects of fault systems and complex siliciclastic reservoirs; and (iv) the critical controls that affect fractured reservoirs.