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July 13, 2026Organic GeochemistryOpen Access

Disentangling primary geochemical signatures and igneous-sedimentary interactions: geochemical, geostatistical and geophysical constraints on depositional conditions and thermal overprint of Devonian source rocks, Parnaíba Basin, NE Brazil

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Authors

JNJorge NadirACAlexandre Ribeiro CardosoGMGabriel Medeiros Marins

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Overview

Randomized trial uncovers hydrocarbon source rock characteristics in an igneous intrusion zone, indicating depositional conditions.

Key Points

  • The aim is to characterize hydrocarbon source rocks and understand the effects of igneous intrusions on their geochemical signatures.
  • Applied a multiproxy geochemical approach in three wells in the Parnaíba Basin.
  • Utilized geophysical logs and multivariate geostatistical classification (Mahalanobis distance).
  • Distinguished pristine and thermally affected intervals based on organic carbon and nitrogen correlations.
  • The reference well shows a strong TOC-TN correlation (r = 0.96); thermally affected wells show weak correlations (r = 0.04 and −0.11).
  • Wells with intrusions have up to ∼80% of samples outside reference geochemical values but preserve pristine signatures in specific intervals.
  • Transgressive phases indicate dominant marine organic matter, while regressive phases show stronger terrestrial input, accumulated under anoxic conditions.

Cite This Study

Nadir et al. (2026) studied this question.

synapsesocial.com/papers/6a548195475c38bf615a5985https://doi.org/10.1016/j.orggeochem.2026.105252
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