10,335
edits
Changes
Jump to navigation
Jump to search
Line 46:
Line 46: − + − + Line 57:
Line 57: − +
The Neuquén Basin: Sequence Stratigraphy of Vaca Muerta Formation (view source)
Revision as of 16:00, 13 March 2019
, 16:00, 13 March 2019→Stratigraphy of Vaca Muerta Formation in El Trapial area
These facies are attributed to an external ramp restricted to basin, where main deposition occurred below the level of storm waves and anoxic conditions.<ref name=Tomassini>Tomassini F., D. Kietzman M. Fatín, L. Crousse, & H. Reijenstein, 2014, Estratigrafía y Análisis de facies de La Formación Vaca Muerta en el área El Trapial, Cuenca Neuquina, Argentina. Simposio de Recursos No Convencionales: ampliando el horizonte energético, pp. 591-599.</ref>
These facies are attributed to an external ramp restricted to basin, where main deposition occurred below the level of storm waves and anoxic conditions.<ref name=Tomassini>Tomassini F., D. Kietzman M. Fatín, L. Crousse, & H. Reijenstein, 2014, Estratigrafía y Análisis de facies de La Formación Vaca Muerta en el área El Trapial, Cuenca Neuquina, Argentina. Simposio de Recursos No Convencionales: ampliando el horizonte energético, pp. 591-599.</ref>
According Tomassini et al.,<ref name=Tomassini /> the interpreted transport and sedimentation processes were strom events that put particles suspension and subsequent decanting. The absence of [[bioturbation]], dark colors and bindstones suggest a low rate of sedimentation, low energy and low oxygen environment.
According Tomassini et al.,<ref name=Tomassini /> the interpreted transport and sedimentation processes were strom events that put particles suspension and subsequent decanting. The absence of [[bioturbation]], dark colors, and bindstones suggest a low rate of sedimentation, low energy and low oxygen environment.
=== Facies 2: outer ramp ===
=== Facies 2: outer ramp ===
It is constituted by alternating marl with packstones and grainstones. Bioclastic concentrations are very similar to those of the previous facies for each lithology.
It is constituted by alternating marl with [[packstones]] and grainstones. Bioclastic concentrations are very similar to those of the previous facies for each lithology.
According Tomassini et al.,<ref name=Tomassini /> these facies are interpreted as an environment of outer ramp, where periods of storm and good weather prevailed.
According Tomassini et al.,<ref name=Tomassini /> these facies are interpreted as an environment of outer ramp, where periods of storm and good weather prevailed.
Composed of laminated shales (few fish scales and bivalves) and interbedded silt and very fine sand .
Composed of laminated shales (few fish scales and bivalves) and interbedded silt and very fine sand .
According Tomassini et al.,<ref name=Tomassini /> these facies belong to offshore- offshore transition deposits, with deposits below the level of strom waves.
According Tomassini et al.,<ref name=Tomassini /> these facies belong to offshore-offshore transition deposits, with deposits below the level of storm waves.
=== Facies Association A ===
=== Facies Association A ===