STRATIGRAPHIC ARCHITECTURE OF UPPER CRETACEOUS GALLUP CLASTIC WEDGE. SHALLOW MARINE AND COASTAL PLAIN STRATA: GALLUP SANDSTONE, MANCOS SHALE AND CREVASSE CANYON FORMATION, SAN JUAN BASIN, NEW MEXICO
Publicado 2013-07-18
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Resumen
A 3-D stratigraphic architecture and facies distribution framework of upper cretaceous coastal plain and shallow marinestrata was established in the Western San Juan basin, New Mexico. Strata are represented by the Turonian-Coniacian GallupSandstone, Mancos shale and Crevasse Canyon Formations. This high-resolution genetic stratigraphic study was conductedin a 1000 km2 area, and used 2000 m of measured section calibrated with 1200 m of outcrop gamma ray from 25 sectionsand 85 plugs. Twenty short-term cycles account for the internal distribution of facies within five facies tracts and reveal alarge degree of compartmentalization. Seven intermediate-term cycles compose a long-term cycle. The basal four cyclesaccount for deposition of seaward-stepping shoreface/tidal couplets and the coeval bay margin to intertidal flat strata duringthe long-term base level fall. These cycles are fully asymmetrical to symmetrical. Three landward-stepping cycles containingtidal influenced open bay, tidal dominated inner shelf and bay-margin/intertidal flat strata occur in the long-term base-levelrise. These cycles are rise asymmetrical. The Gallup Sandstone consists of seaward-stepping shoreface/tidal couplets. Thelandward-stepping Tocito Member of the Mancos Shale overlies the Gallup and no major stratigraphic dislocation isobserved at the contact between them. Those changes are expressions of sediment volume partitioning and facies differentiationaccompanying changes in accommodation and sediment supply (A/S).
Key words: Stratigraphy, Genetic, Sedimentology, Facies, Successions, Associations, Modeling, Simulation, New Mexico,Gallup, Tidal, Reservoirs.1Dirección actual: Occidental de Colombia
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Referencias
Alvarez-Bastos, M. (2003). Recognition of AncientShoreface Deposits. Facies, Facies Sucessions, andAssociations. An Example from the Cretaceous GallupClastic Wedge, New México. Boletín de Geología UIS,Vol. 25, No. 40. pp. 59-80
Alvarez-Bastos, M. (2002). High Resolution GeneticStratigraphy of Upper Cretaceous Shoreface/Tidal Couplets,Gallup Sandstone, Crevasse Canyon Fm, Mancos Shale,Western San Juan Basin, New México. UnpublishedDissertation. Colorado School of Mines. 295 p.
Cross, T. A., and M. A. Lessenger. (1997). CorrelationStrategies for Clastic Wedges, inInnovative applicationsof petroleum technology in the Rocky Mountain area
Cross, T. A., and M. A. Lessenger. (1998). TheShoreface/ Tidal couplet: a mechanism for tapping intocoarse sediment. APG Annual meeting ExpandedAbstracts.
Jones, C. R. (1991). San Juan Basin Segment, NewMexico. in Taylor, D. C. Jennette, and G. W. Riley, eds.Sequence stratigraphy applications to shelf sandstonereservoirs- Outcrop to subsurface examples: AAPG fieldconference (not consecutively paginated).
Moleenar, C. M. (1973). Sedimentary facies and correlationof the Gallup Sandstone associated formations,northwestern New Mexico, in J. E. Fassett, ed., Cretaceousand Tertiary rocks of the Colorado Plateau: Four CornersGeological Society Memoir, pp. 85-110.
Molenaar, C. M, and J. K, Baird. (1992). Regionalstratigraphic cross sections of the Upper Cretaceousrocks across the San Juan basin, northwestern NewMexico and southwestern Colorado: USGS open filereport, pp. 92-257.
Nummedal, D. and Molenaar, C. M., (1995). Sequencestratigraphy of ramp-setting strand plain successions;the Gallup Sandstone, New Mexico, in Van-Wagoner, J.
Wheeler, H. E., (1964). Baselevel, lithosphere surface,and time-stratigraphy: GeologicalSociety of AmericaBulletin, Vol.7, pp. 599-610.