The Recognition and Mapping of a Basal Transgressive Sand from Outcrop, Subsurface, and Seismic Data
W. O. Abbott, 1985. "The Recognition and Mapping of a Basal Transgressive Sand from Outcrop, Subsurface, and Seismic Data", Seismic Stratigraphy II: An Integrated Approach to Hydrocarbon Exploration, Orville Roger Berg, Donald G. Woolverton
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Basal transgressive sands can be defined by a careful integration of outcrop, well and seismic data w ithin the concept of an unconformity-bounded depositional sequence. This integration permits accurate prediction of potential stratigraphic traps. Only moderate attention has been paid to the basal transgressive sand as a prime objective reservoir for oil and gas accumulation. In the past it has not been generally recognized as a separate genetic unit, but grouped with the underlying deltaic and/or fluvial sand. Indeed it is usually only over areas of igneous, metamorphic and folded sedimentary terranes that it can be easily distinguished. Through analysis of the lithologic, biologic, acoustic and bore-hole characteristics of the basal transgressive sand, potential hydrocarbon trap geometries can be identified.
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The publication of AAPG Memoir 26 opened up a whole new field to the exploration community. The material contained in that publication demonstrated the relationship of seismic data to the geology of the subsurface in greater detail than previously thought possible. In the years that have followed great effort has gone into refining and advancing the principles and methods of seismic stratigraphy. The goal of this Memoir 39 publication is to provide 15 papers which present and document the advances and refinements in seismic stratigraphic princples and methods that have occurred since the publication of Memoir 26. These articles help the geologist, geophysicist, and manager to keep abreast of this rapidly developing field and provide some guidelines for the evaluation of stratigraphically controlled prospects.