Chayane Vitória Félix Fonseca , David Lopes de Castro , Diógenes Custódio de Oliveira , Daniel Teixeira dos Santos , Heriscarth Marcell Dantas Pinheiro , Lívian Rafaely de Santana Gomes Pinheiro
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Abstract
This study characterizes the thermal regime of the Barreirinhas Basin, located in the central sector of the Brazilian Equatorial Margin (BEM), based on 592 temperature records obtained from 85 exploratory wells, encompassing both onshore and offshore areas. Bottom-hole temperature (BHT), drill-stem test (DST), and extrapolated temperature (ET) measurements have been corrected using conventional methods, including the American Association of Petroleum Geologists (AAPG), Horner-plot, and a Linear Adjustment approach developed in this study. The AAPG method exhibited the best performance for BHT data (R2 = 0.8463), while the Linear Adjustment technique showed consistent results in DST data correction. Corrected temperatures ranged from 45 °C to 165 °C across the Barreirinhas basin, associated with geothermal gradients from 19 °C/km to 40 °C/km. The geothermal gradient decreases sharply down to 800 m, stabilizing around 30 °C/km and decreasing to 20 °C/km at depths greater than 5000 m. Thick sedimentary layers act as thermal insulators, limiting heat dissipation to the surface and reducing the geothermal gradient by the blanket effect. These thermal conditions indicate potential for liquid hydrocarbon generation between 1500 and 3500 m depth, whereas gas generation may occur at depths greater than 3550 m. The correlation between the thermal regime and the internal architecture of the basin is consistent with patterns observed in Asian transform margins, as well in the conjugate African Equatorial Atlantic margin, reinforcing the relevance of the Barreirinhas Basin as a potential reservoir for energy resource production.
期刊介绍:
Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields:
-Economic geology, metallogenesis and hydrocarbon genesis and reservoirs.
-Geophysics, geochemistry, volcanology, igneous and metamorphic petrology.
-Tectonics, neo- and seismotectonics and geodynamic modeling.
-Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research.
-Stratigraphy, sedimentology, structure and basin evolution.
-Paleontology, paleoecology, paleoclimatology and Quaternary geology.
New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.