A new integration of basement architecture and basin evolution

The Onshore North Africa SEEBASE® Structural Study builds on FROGTECH’s expertise from over 50 projects across Africa undertaken over the last 15 years. This high-resolution regional overview of basement geology demonstrates the response and evolution of the more than 70 individual basins across North Africa including new previously unrecognised potential depocentres in Egypt, Niger and Algeria.

This product is a comprehensive package of the geologic evolution of North Africa with supporting maps for approximately 20 events and basin phases coupled with underpinning datasets and analysis. Shown within this study is the fundamental link between basement evolution and key petroleum system elements across the whole of North Africa

3D oblique view of the Onshore North Africa SEEBASE.

3D oblique view of the Onshore North Africa SEEBASE.

Onshore North Africa SEEBASE highlights the role of regional crustal architecture influencing the location and geometry of basins while providing the strategic basis to focus future exploration activities and data acquisition programs.

Insights that reduce risk, predict vulnerabilities and guide new exploration  

Basin Phase Correlation charts are included in the Onshore North Africa Study.

Basin Phase Correlation charts are included in the Onshore North Africa Study.

One time-slice showing basin phases and palaeography in North Africa

One time-slice showing basin phases and palaeography in North Africa

The Onshore North Africa SEEBASE study yields valuable new insights into the architecture of both basement and basins:

  • More than 80 basement terranes comprise the basement of onshore North Africa, recording a tectonic history that spans from the Archean through the Late Neoproterozoic amalgamation of Gondwana.

  • More than 70 basins, including new previously unrecognised potential depocentres, e.g. a Late Neoproterozoic-Early Paleozoic basin interpreted in Egypt; Mesozoic rift basins in Niger and Algeria.

  • Structural interpretation for each event/basin phase illustrates kinematics, initiation and reactivation age, thereby depicting distribution of active faulting during key trap-formation, hydrocarbon migration and seal modification events.

  • The coevolution of basement and basins across North Africa is presented through corresponding “fault event” and basin phase maps, and reveals a history of segmentation and re-shaping of broad, early passive margin basins and major rift systems, organised along terrane and megaterrane boundaries.

  • The regional occurrence and distribution of key source rocks has been revised/refined within the context of the SEEBASE depth-to-basement model, basin phases and event analysis.

  • The regional basement heat flow model, integrates a wide range of available geological/geophysical data and highlights areas for further data acquisition and investigation.

comprehensive study deliverables

Included in the Onshore North Africa SEEBASE Structural Study and GIS is a comprehensive 197 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.

  • Basement Geology: Analysis and description of basement terranes and megaterranes, assessment of terrane boundaries, and interpretation of basement composition.

  • SEEBASE™ depth-to-basement: 3D geometry and depth of basement surface highlighting basin depocentres and highs (at a minimum scale of 1:5 Million).

  • Basin Analysis: New and revised Present-day outlines, consistent with the SEEBASE basement topography, for more than 70 basins across North Africa. Basin phase responses to key tectonic events for each basin is presented in map view including regional paleogeography and selected potential source rock distribution.

  • Tectonostratigraphic history:

    • Summary of key tectonic events, with tectonic reconstruction maps from the Precambrian through the Cenozoic. Reconstruction maps produced using FROGNet™, FROGTECH’s proprietary, terrane-based Rigid Plate Reconstruction Model.
    • Fault event, basin phase and paleogeographic maps corresponding to key tectonic events and/or discrete climatic changes; and summary of implications for structural and depositional evolution of basins.
    • Tectonostratigraphic charts for each basin showing key events, basin phase responses and timing of potential source intervals.
  • Depth to Moho: 3D geometry and depth of the Moho surface.

  • Maps and grids of sediment, crustal and basement thickness, crustal extension and Moho depth: Derivative maps created using the SEEBASE.

  • Inferred Basement Heat Flow model: Computation of radiogenic heat production and heat flow, integrating basement geology and architecture, as well as timing and intensity of regional tectonothermal events.
  • Petroleum Prospectivity: Interpreted trends of known hydrocarbon fields across North Africa highlighting areas of opportunity on a regional scale.
Frogtech’s SABRE™ (Systematic Approach to Basin Resource Evaluation) methodology and “Bottom-up” approach to basin analysis provide a range of key deliverables (such as potential field datasets, basement geology, SEEBASE, tectono-stratigraphic history, and present-day basement heat flow).

Frogtech’s SABRE™ (Systematic Approach to Basin Resource Evaluation) methodology and “Bottom-up” approach to basin analysis provide a range of key deliverables (such as potential field datasets, basement geology, SEEBASE, tectono-stratigraphic history, and present-day basement heat flow).

3D oblique view of the North Africa SEEBASE

3D oblique view of the North Africa SEEBASE

INTEGRATED, PROJECT READY AND INSIGHTFUL

Basement Terranes and interpreted structure layers are fully attributed to provide a full kinematic history of Onshore North Africa.

Basement Terranes and interpreted structure layers are fully attributed to provide a full kinematic history of Onshore North Africa.

Annotated Plate Reconstruction maps of key events are produced using FROGNet™ and PaleoGIS.

Annotated Plate Reconstruction maps of key events are produced using FROGNet™ and PaleoGIS.

Each SEEBASE study is designed to be project ready. The Onshore North Africa SEEBASE Structural Study and GIS is supplied as a fully integrated geophysical and geological study of basement and basin evolution of North Africa 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 a seamless and comprehensive interpretation of crystalline basement for the regional North Africa. The study provides significant new insights into the distribution of depocentres and the structural and paleogeographic evolution of these 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 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. This compendium of high resolution fully integrated datasets with interpretation, including new insights ranging from heatflow, source rock distribution and detailed basement architecture make the Onshore North Africa SEEBASE Structural Study and GIS a fundamental and cost-effective resource for any serious regional exploration and/or petroleum systems analysis. Comprehensive coverage of a multitude of datasets can be used to identify, plan and risk future exploration and data acquisition.

SEEBASE Onshore North Africa CORE Benefits

  • Start with the best foundation on which to develop new exploration concepts and strategies.
  • Know the limits of basin systems with updated and previously unrecognised depocentres.
  • Understand where and why traps are formed and modified with distribution maps of active faulting during key trap-forming/deforming events.
  • Identify potential for undiscovered hydrocarbons including the relationship between known hydrocarbon fields and basement evolution.
  • Reduce risk away from calibration models for basin and thermal modelling with full coverage models of present-day basement heat production and heat flow calculated from basement composition derived heat production, crustal thickness and tectonothermal history.
 
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.