Extrusive sandstones (extrudites): a new class of stratigraphic trap?
Published:January 01, 2006
Andrew Hurst, Joseph A. Cartwright, Mads Huuse, Davide Duranti, 2006. "Extrusive sandstones (extrudites): a new class of stratigraphic trap?", The Deliberate Search for the Stratigraphic Trap, M. R. Allen, G. P. Goffey, R. K. Morgan, I. M. Walker
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Extrusive sandstone bodies are identified as entirely stratigraphic traps associated with sand injectites. They may be difficult to recognize but have four-way dip closure and are invariably connected through underlying lower permeability strata to parent sandbodies by sandstone dykes or transgressive sills that belong to sand injectite complexes. Extrusive sandstones (extrudites) constitute an immature exploration target, which is largely untested by deliberate exploration wells. Using seismic data alone, the distinction between extrudites and intrusive sills, and between extrudites and depositional sands, may be problematic. Sedimentological criteria may make differentiation possible when core is available. Extrudites are likely to have...
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The Deliberate Search for the Stratigraphic Trap
Twenty-four years have elapsed since the publication of Halbouty’s AAPG Memoir of 1982, The Deliberate Search for the Subtle Trap. Since then, the technologies employed in hydrocarbon exploration have become extraordinarily sophisticated, yet current exploration for stratigraphic traps is to some extent restricted to areas where seismic data simplifies exploration by allowing direct inference of fluid fill and reservoir development. This Special Publication draws upon contributions that examine current industry perceptions of stratigraphic trap exploration and the technologies, tools and philosophies employed in such exploration, given the changing industry environment.
This book contains a collection of papers examining a number of themes related to exploration for stratigraphic traps, ranging from play and risk assessment, through regional assessments of stratigraphic trapping potential, specific exploration programmes targeted at stratigraphic traps to specific working traps and plays where stratigraphic trapping is prevalent.