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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
anofrom:
-Chapa
Geologic Evolution and Gas Resources of the Sabinas Basin in Northeastern Mexico
Samuel Eguiluz de Antuano
PEMEX Exploraci
n, Reynosa, Tamaulipas, Mexico
ABSTRACT
n. Basin
fill is composed mainly of Mesozoic marine sediments deposited during long-term subsidence
and folded during Late Cretaceous and Paleogene Laramide orogenesis. The origin of the
basin is related to a rift associated with the opening of the Gulf of Mexico. More than
5000 m of sedimentary rocks was deposited in the Sabinas Basin. Three supersequences have
been defined. The first represents synrift sediments and is composed of conglomerates and
evaporites with associated basic igneous rocks. The following supersequence (144-96 m.y.)
comprises several higher-frequency cycles represented by carbonate, evaporite, and coastal
siliciclastic deposits of extensive platforms on a passive margin. The youngest
supersequence (96-39.5 m.y.) consists mainly of regressive, terrigenous clastic facies
deposited in a foreland setting. Subsidence was 40% to 70% greater during the initial rift
stage than during subsequent depositional stages. Several lateral and vertical facies
changes in the basin were controlled by the Coahuila and Tamaulipas basement blocks, as
well as other, smaller blocks.
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