PetroStrat (in association with Petricore) is undertaking a non-proprietary (multi-client) biostratigraphy focused study of 7 wells that penetrate the Lower Tertiary sands in the deep-water Perdido trend, offshore Mexico. This builds on the robust high resolution stratigraphic framework established for the Paleogene (Frio to Wilcox) sediments of the U.S. deep water GoM. It will help facilitate detailed well correlations, seismic interpretation, petro-physical evaluation and sand provenance studies.

Mexican Perdido Study High Resolution Biostratigraphy of the Paleogene PetroStrat Well Map

Study Overview

  • The target wells for the study are: Trion-1, Exploratus-1, Maximino-1, Vasto-1, Pep-1, Corfu-1 and Supremus-1.
  • Fully quantitative analysis of samples at an average spacing of 9m -15m (30ft – 50ft).
  • All three biostratigraphic disciplines.
  • Micropalaeontology (chiefly forams) and nannopalaeontology focused mainly upon the Oligocene–Eocene succession.
  • Palynology applied throughout the entire Paleogene.
  • Will build upon PetroStrat’s 29 well palynology focused U.S deep water GoM consortium study (completed in January 2018).
  • Will apply the 25-fold subdivision of the Wilcox/Midway succession, whilst also extending this framework up through the Middle-Late Eocene and Oligocene
  • Will better integrate the palynological framework with foram and nanno data to achieve a more refined calibration of both local and basin wide palynofloral events with the global timescale.
Mexican Perdido Study High Resolution Biostratigraphy of the Paleogene PetroStrat Example Dataset

Benefits of Participating in this Study

  • Reduced uncertainty, increased confidence in regional correlations.
  • Reliable data enables confident calibration of seismic, identification of sequence boundaries (using biostratigraphic and log criteria) and quantification of unconformity magnitudes.
  • Greater understanding of sediment distribution, and depositional setting (through palaeoenvironments), which will influence source/seal/reservoir distribution.
  • Focus covering the Tertiary, in line with present play concepts in the Sureste Basin.
  • Exceptional value for money, when compared with proprietary rates.

Palynology in the Lower Tertiary

PetroStrat has empirically developed a palynological zonation for the Paleogene of the deep water GoM. This is based on >50 deep water well penetrations from across a wide transect of the U.S. GoM. The zonation uses both allochthonous, terrestrially derived pollen & spores and autochthonous marine dinocysts to divide the Wilcox in to palynological zone/subzones. Our stratigraphic understanding of the Wilcox has been further enhanced by the palynology applied to >35 onshore well sections, inclusive of a significant number of cores.

Palynology has long been underutilized in the GoM and yet provides the best stratigaphic tool when the ocean chemistry is calcite deficient (precluding calcareous faunal/floral development) or when terrigenous materials (including land derived fossils such as pollen) overwhelm the autochthonous faunas and floras. Restricted circulation can actually enhance palynology recovery because dysaerobic bottom conditions preclude benthic faunas & floras that consume organic matter deposited on the ocean floor.

Learn more about this innovative study

For more information, please download our PDF flyer.


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