A comprehensive interpretation of the heterogeneous Black Sea basement

Black Sea SEEBASE® Lite is the first commercially available regional interpretation of basement architecture covering the whole Black Sea basin and its surrounding reactivated margins, revealing the 3D topography of the Eastern and Western Black Sea deep basins and surrounding depocentres.

The Black Sea SEEBASE Lite study provides important insights into the complex evolution of the basement-involved structures bounding the main depocentres and reactivated margins.

In the Black Sea, basement maps limited to the main Western and Eastern basins generally represent the base of the late Early Cretaceous synrift sequence excluding older sediments which may be considered as potential HC sources. Therefore, the Black Sea SEEBASE 3D model (image below) provides a significantly higher-resolution interpretation than those previously available.

3D image of the Black Sea depth to basement SEEBASE showing the northern reactivated margin in the Crimea region.

3D image of the Black Sea depth to basement SEEBASE showing the northern reactivated margin in the Crimea region.

New regional insights that reduce risk, predict vulnerabilities and guide new exploration  

Black Sea SEEBASE Lite - Digital Elevation Model showing complete product coverage of all permit areas.

Black Sea SEEBASE Lite - Digital Elevation Model showing complete product coverage of all permit areas.

Black Sea SEEBASE Lite includes Frogtech Geoscience's proprietary enhancements of Core Datasets including gravity (above), magnetics and DEM.

Black Sea SEEBASE Lite includes Frogtech Geoscience's proprietary enhancements of Core Datasets including gravity (above), magnetics and DEM.

Oblique 3D view of the Black Sea SEEBASE.

Oblique 3D view of the Black Sea SEEBASE.

The Black Sea SEEBASE Lite Study and GIS provides a fully integrated geophysical and geological interpretation of basement geology, tectonic evolution and basin development. The interpreted and hand-contoured SEEBASE model defines basement topography in a manner that is superior to simple gridding of depth points from seismic, magnetic and gravity data sets.

The SEEBASE model is presented with constraints and observation from advanced potential field grids and modelling, detailed mapping and description of 41 basement terranes, tectonic plate reconstructions spanning the Early Paleozoic to Recent as well as geologically driven basement heat flow calculation.

The study yields valuable new insights into the architecture of both basement and basins:

  • The new regional depth-to-basement grid (SEEBASE) represents a significant step forward in defining the geometry of the Black Sea basins including the older section beneath the late Lower Cretaceous syn-rift sedimentary sequence.
  • Structural analysis links the development and the geometry of the reactivated northern margin to basement pre-existing structures on the development of basins.
  • Contrasting rheology of underlying basement and difference in location along the convergent margin resulted in variations in structural and thermal basin evolution for the Eastern and Western Black Sea basins.
  • Gravity models, seismic and the crustal thickness would rather suggest the presence of highly thin (hyperextended) to transitional crust associated to altered mantle rocks beneath the deepest part of the Western and Eastern Black Sea basins.
  • Asymmetric geometry of the Eastern Black Sea basin is largely controlled by constraining rheology at the arc-forearc boundary. Together with mantle serpentinisation, this will have significant implications for both the subsidence history and thermal models.

comprehensive study deliverables

Included in the Black Sea SEEBASE Lite Study and GIS is a comprehensive 122 page digital (print ready) report and a project ready ArcGIS data package covering:

  • Potential Field Datasets: FROGTECH's state-of-the-art geophysical processing and enhancements of public domain gravity and magnetic data, including several FROGTECH proprietary enhancements and a suite of filters, as well as advanced 2D gravity modelling along key lines constrained with seismic interpretation.
  • Basement Geology: A detailed analysis and description of 41 basement terranes including its age, composition and fabric.
  • Tectonostratigraphic history: Plate reconstructions and summary of key tectonic events spanning the Early Paleozoic to Recent; including implications for basin development; and interpretation of major basement faults. Tectonic reconstruction maps were produced using FROGNet™ – FROGTECH’s proprietorial, terrane-based Rigid Plate Reconstruction Model.
  • SEEBASE Depth to Basement model: 3D geometry and depth of the basement surface highlighting basin depocentres and structural highs.
  • Maps of sediment, crustal and basement thickness, and crustal extension: Derivative maps created using the SEEBASE and Moho models.
  • Inferred Basement Heat Flow: Computation of radiogenic heat production and heat flow, integrating basement geology and crustal architecture, as well as timing and intensity of regional tectono-thermal events.
 
Black Sea SEEBASE ArcGIS includes project ready geo-referenced, integrated datasets that can be optionally further calibrated with client data ensuring improved insights and new ideas on basin architecture and evolution, as well as a better understanding of the extent of known and new depocentres.

Black Sea SEEBASE ArcGIS includes project ready geo-referenced, integrated datasets that can be optionally further calibrated with client data ensuring improved insights and new ideas on basin architecture and evolution, as well as a better understanding of the extent of known and new depocentres.

Integrated, project ready and insightful

Each SEEBASE study is designed to be project ready. The Black Sea SEEBASE Lite Study and GIS is supplied as a fully integrated geophysical and geological study of basement and basin evolution of the Black Sea at a regional scale using public domain datasets enhanced using Frogtech Geoscience proprietary processing.

The SEEBASE model of the 3D depth and geometry of the basement surface provides the first commercially available seamless interpretation of crystalline basement for the regional Black Sea and provides significant new insights into the distribution of depocentres. The study also presents a regional tectonic synthesis and interpretation that includes descriptions of basement terranes, Frogtech Geoscience plate reconstruction models, basement composition, and calculations for basement-derived heat flow.

The integrated evaluation of the SEEBASE surface and accompanying Moho model highlights both the regional crustal architecture and variations in crustal thickness at a much higher resolution than available from published crustal models. These centre-piece features, along with other deliverables, make the Black Sea SEEBASE Lite Study and GIS a cost-effective regional evaluation tool that gives a first-pass perspective on the geology and regional prospectivity of this complex area providing a basis for focusing future exploration and data acquisition strategies to reduce exploration risk and underpin petroleum systems analysis.

 

Black Sea CORE Benefits

  • Leverage the hand-contoured SEEBASE model to understand depth to crystalline basement, rather than an automated magnetic basement grid (avoiding the challenges of super deep Black Sea basins).

  • Understand petroleum systems through the limits and geometry of basin systems and basin compartmentalisation through time.

  • Identify and assess structural relationship between basement structures, evolution, and know hydrocarbon field distribution to predict potential undiscovered hydrocarbons and constrain oil and gas exploration targets.

  • Enhance and extrapolate your permit or basin-scale geological interpretations based on the regional basement model.

  • Improve your model of source rock deposition and distribution.

  • Use plate reconstruction models to:

    • provide insight into the structural and thermal response of the basement and overlying basins to complex plate tectonics, and
    • constrain reconstructions of paleodepositional environments and paleogeography.
  • Reduce risk for basin and thermal modelling with a geologically-controlled regional basement derived heat flow model and better understand its effects on basin maturation
Radiogenic heat flow models highlight variations due to basement composition and crustal thickness.

Radiogenic heat flow models highlight variations due to basement composition and crustal thickness.

Detailed FROGNet plate reconstructions of key events provide valuable insights into the complex convergent setting of the Eurasian margi

Detailed FROGNet plate reconstructions of key events provide valuable insights into the complex convergent setting of the Eurasian margi