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Towards the Standardization of Sequence Stratigraphy

Catuneanu, Octavian 1; Abreu, Vitor 2; Bhattacharya, Janok 3; Blum, Michael 4; Dalrymple, Robert W.5; Eriksson, Patrick 6; Fielding, Christopher 7; Fisher, William L.8; Galloway, William 9; Gibling, Martin R.10; Giles, Katherine 11; Holbrook, John 12; Kendall, Christopher G.13; Macurda, Brad 14; Martinsen, Ole 15; Miall, Andrew 16; Neal, Jack 17; Nummedal, Dag 18; Posamentier, Henry W.19; Pratt, Brian 20; Sarg, Rick 21; Shanley, Keith 22; Steel, Ronald J.23; Strasser, Andreas 24; Tucker, Maurice 25
1 University of Alberta, Edmonton, AB, Canada.
2 ExxonMobil Exploration Company, Houston, TX.
3 University of Houston, Houston, TX.
4 Louisiana State University, Baton Rouge, LA.
5 Queen's University, Kingston, ON, Canada. (6) University of Pretoria, Pretoria, South Africa. (7) University of Nebraska-Lincoln, Lincoln, NE. (8) The University of Texas at Austin, Austin, TX. (9) The University of Texas at Austin, Austin, TX. (10) Dalhousie University, Halifax, NS, Canada. (11) New Mexico State University, Las Cruces, NM. (12) The University of Texas at Arlington, Arlington, TX. (13) University of South Carolina, Columbia, SC. (14) The Energists, Houston, TX. (15) StatoilHydro Technology and New Energy, Bergen, Norway. (16) University of Toronto, Toronto, ON, Canada. (17) ExxonMobil Exploration Company, Houston, TX. (18) Colorado School of Mines, Golden, CO. (19) Chevron Energy Technology Company, Houston, TX. (20) University of Saskatchewan, Saskatoon, SK, Canada. (21) Colorado School of Mines, Golden, CO. (22) Stone Energy LLC, Denver, CO. (23) The University of Texas at Austin, Austin, TX. (24) University of Fribourg, Fribourg, Switzerland. (25) Durham University, Durham, United Kingdom.

Sequence stratigraphy emphasizes facies relationships and stratal architecture within a chronological framework. Despite its wide use, sequence stratigraphy has yet to be included in any stratigraphic code or guide. This lack of standardization reflects the existence of competing approaches. Standardization of sequence stratigraphy requires the definition of the fundamental model-independent concepts, units, bounding surfaces and workflow that outline the foundation of the method. A standardized scheme needs to be sufficiently broad to encompass all possible choices of approach, rather than being limited to a single approach or model.

A sequence stratigraphic framework includes genetic units that result from the interplay of accommodation and sedimentation, namely forced regressive, lowstand and highstand normal regressive, and transgressive, which are bounded by ‘sequence stratigraphic’ surfaces. Each genetic unit is defined by specific stratal stacking patterns and bounding surfaces, and consists of a tract of correlatable depositional systems (i.e., a ‘systems tract’). The mappability of systems tracts and sequence stratigraphic surfaces depends on depositional setting and the types of data available for analysis. It is this high degree of variability in the expression of sequence stratigraphic units and bounding surfaces that requires the adoption of a methodology that is sufficiently flexible that it can accommodate the range of likely expressions. The integration of outcrop, core, well-log and seismic data affords the optimal approach to the application of sequence stratigraphy. Missing insights from one set of data or another may limit the ‘resolution’ of the sequence stratigraphic interpretation.

A standardized workflow of sequence stratigraphic analysis requires the identification of all genetic units and bounding surfaces that can be delineated objectively, at the selected scale of observation, within a stratigraphic section. Construction of this model-independent framework of genetic units and bounding surfaces ensures the success of the sequence stratigraphic method. Beyond this, the interpreter may make model-dependent choices with respect to which set of sequence stratigraphic surfaces should be elevated in importance and be selected as sequence boundaries. In practice, the succession often dictates which set of surfaces are best expressed and hold the greatest utility at defining sequence boundaries and quasi-chronostratigraphic units.


AAPG Search and Discovery Article #90090©2009 AAPG Annual Convention and Exhibition, Denver, Colorado, June 7-10, 2009