A unified regional interpretation of Northern Iran and the Greater Caspian Basement.
Leading up to the 2017 Iran Bid rounds, the Northern Iran and the Greater Caspian SEEBASE® Study and GIS provides comprehensive coverage of the National Iranian Oil Company's exploration blocks, representing an essential foundation data set for play based exploration enabling companies to bid with confidence.
The study is the first cross-border detailed interpretation of basement architecture covering the geopolitically and geologically complex Northern Iran and Greater Caspian regions, revealing among others, Permo-Triassic rifts in Central Caspian (Scythian-Turan platform).
This study echos the Black Sea SEEBASE study to provide a regional coherent structural and geodynamic model of the Northern Iran and Greater Caspian region, and to give valuable insights into the basement-involved structural and rheological control on basins development.
Although the Northern Iran and Greater Caspian region has a long history in hydrocarbon exploration, there is no clear structural and tectonic model in which you can place basin formation and petroleum systems. Complex geology and compartmentalised information are often seen as one of the key obstacles. The study enables to understand more clearly the tectonic evolution and build a single consistent geodynamic and basin model that links together the different geological and petroleum provinces.
New regional insights that reduce risk and guide new exploration
The Northern Iran and Greater Caspian SEEBASE 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 59 basement terranes, tectonostratigraphic compilations for the Precaspian, Middle Caspian and South Caspian areas, 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 basins (Precaspian, Middle Caspian, South Caspian) and their structural relationships across the Greater Caspian region.
A broad en-échelon rift system has been mapped in the Central Caspian (i.e. Scythian-Turan), comprising multiple grabens associated with NW-SE curvilinear crustal strike-slip fault zones developed during the Late Permian-Early Triassic.
- These large strike-slip fault systems are largely controlled by inherited Hercynian structures as well as the pre-existing geometry of the southern margin of the East European Cratons.
- Oil and gas fields aligned with this structural fabric give further opportunity along trend in the less explored areas.
- Rheological boundary along the arc-forearc boundary as well as reactivated inherited basement structures strongly influenced the geometry, segmentation and subsidence of the South Caspian basin during both Jurassic extension and Tertiary compression.
- Gravity models and crustal thickness support the presence of Permo-Triassic rifts buried beneath thick Mesozoic and Cenozoic sediments in the Middle Caspian basin.
- Thick-skinned reactivation structures in the Terek-Sulak and Kopet Dagh foreland basins may have compromised the integrity of traps and seals of older rift basins developed onto the Scythian-Turan basement.
comprehensive study deliverables
Included in the Northern Iran and Greater Caspian SEEBASE Study and GIS product is a comprehensive 121 page digital (print ready) report and a project ready ArcGIS data package covering:
- Basement Geology: A detailed analysis and description of 59 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 Beta Factor: 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 architecture, as well as timing and intensity of regional tectonothermal events.
- 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.
Integrated, project ready and insightful
Each SEEBASE and SEEBASE Lite study is designed to be project ready. The Northern Iran and Greater Caspian SEEBASE Lite Study and GIS is supplied as a fully integrated geophysical and geological study of basement and basin evolution. This new and seamless cross border SEEBASE interpretation of crystalline basement is based on publicly available potential field datasets, fully calibrated with published seismic and cross-sections, geological maps and the latest plate reconstructions from the Frogtech proprietary Rigid Plate Reconstruction Model, FROGNet™.
Included in this product is a fully integrated basement model of terranes, composition, structure, heat-flow, crustal stretching and geometry as well as a series of maps for key tectonic events that describes the tectonostratigraphic history of the region. This study articulates the fundamental basement controls on basin evolution with observations critical to petroleum system analysis including heat flow, the geometry and evolution of depocentres as well as trap formation and modification events. The SEEBASE model is an authoritative tool coupled with comprehensive datasets and critical analysis making the Northern Iran and Greater Caspian SEEBASE Lite Study and GIS and cost-effective resource for any petroleum exploration team in the region. Comprehensive coverage of a multitude of datasets can be used to identify, plan and risk future exploration and data acquisition.
SEEBASE Greater Caspian CORE Benefits
Use the 3D SEEBASE depth to basement model and thickness predictions in areas of ambiguous, sparse or no data.
Leverage the hand-contoured SEEBASE model to understand depth to crystalline basement, rather than an automated magnetic basement grid (avoiding the challenge of super deep basins such as the South Caspian Sea).
Coverage of the Northern Iran and Greater Caspian region from the Precaspian Basin to the South Caspian Sea, highlighting the detailed internal geometry of the different petroleum provinces and the structural and temporal interplay between the different heterogeneous basement and the overlying 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 of the Greater Caspian basins systems.
Use the basement interpretation to assist re-evaluation of your model of source rock deposition and distribution in the Middle Caspian Basin.
Use plate reconstruction models to:
provide insight into the structural and thermal response of the basement and overlying basins to 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.