Abstract:
The main objective of this study is to identify and characterize distinct crustal thermal structures in the Campos Sedimentary Basin region, located in southeastern Brazil. The Campos Basin plays a significant role in Brazil s oil production, with a current focus on pre-salt sediments. Geothermal studies can aid in understanding the evolutionary processes of sedimentary basins by determining the crustal thermal regime of the continent-ocean transition zone, as is the case with passive margin-type sedimentary basins, and consequently in better understanding the site s exploration potential.
To this end, geothermal data from BHT (Bottom Hole Temperature) measurements in deep wells in offshore regions of the basin were incorporated to map the distribution of its geothermal parameters. The incorporation of new data enabled the refinement of the characterization of the thermal state of the crust in the studied basin, allowing for a more detailed analysis of temperature variation as a function of depth. This improvement contributed to a better understanding of crustal thermal processes, reducing uncertainties in existing thermal models and providing more robust support for geological and geophysical interpretations of the area. The geothermal database for the Campos Basin, maintained by the Geothermal Laboratory of the National Observatory (LabGeot/ON), initially consisted of 72 measurements in the offshore region and 13 measurements in the adjacent onshore areas of the basin, which were subsequently expanded with new data throughout this study. Additionally, 1.473 new geothermal records were requested and made available by the National Agency of Petroleum, Natural Gas and Biofuels (ANP), which, when incorporated into the pre-existing dataset, total 1.544 geothermal data points. The expansion of this dataset represents a significant advance in the available information base, enabling more robust analyses and a substantial refinement of the basin s thermal characterization.
