Architecture of a transgressive systems tract
Coniacian-age marginal marine strata in the San Juan basin illustrate well the three-dimensional architecture of the transgressive component of a third-order depositional sequence. The predictive potential of the model presented here lies in its ability to relate marine, shale-enclosed reservoir sand bodies, in themselves below seismic resolution, to the depositional sequence boundary and condensed section, which normally are very distinct seismic stratigraphic markers. A sequence boundary is identified at the erosional base of the seaward units of the Tocito Sandstone by (1) a hiatus spanning three Inoceramus faunal zones, (2) basal onlap in the sequence above the hiatus as mapped in a pattern of progressively farther landward extent of younger bentonites, and (3) abrupt shallowing of facies across the hiatus. Traced up the depositional dip, the sequence boundary continues beneath a coarse fluvial sandstone (Torrivio sandstone) as demonstrated by incision of this unit into an underlying strand plain, the Gallup Sandstone.
- OSTI ID:
- 6131492
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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Sequence stratigraphic framework of the Cretaceous Gallup and Tocito sandstones, San Juan basin, New Mexico
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CORRELATIONS
FEDERAL REGION VI
FORECASTING
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEOLOGY
MINERAL RESOURCES
NEW MEXICO
NORTH AMERICA
OIL SHALE DEPOSITS
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATIGRAPHY
TECTONICS
THREE-DIMENSIONAL CALCULATIONS
USA