Results of a 3D facies modelling attempt in the Lower Main Plains (Frankfurt, Germany) Hannah Budde Christian Hoselmann, Rouwen Lehné, Gudrun Radtke, Heiner Heggemann, Andreas Hoppe
Lower Main Plains Geologic Overview Wetterau Wiesbaden Frankfurt am Main Quaternary Tertiary Early Triassic Early Permian Mainz Mainz Basin Upper Rhine Graben Hanau Basin Pre-Permian 10km Geologische Übersichtskarte Hessen 1:300.000; Topographische Grundkarte Hessen 1:200.000
Lower Main Plains - Goals Goals: Creation of a high resolution geological 3D-model for the Lower Main Plains Visualization of important Quaternary and Tertiary units Easily comprehensible for external user Compatibility with existing 3D -models at the HLNUG Great benefit for daily business work Input Data: 20.000 project related wells 26 geological maps 1:25.000
Oligocene Tertiary Miocene Target Horizons Quaternary Pliocene differentiation in terraces and aeolian sediments Base Quaternary Base Pliocene distribution and Base Basalt Formation distribution and Base Ginnheim Coal Base Frankfurt Clay Limestones Base Tertiary limestones Marls Modified after Radtke et al. 2009
Lower Main Plains - Parameterization Goals: Creation of a high resolution geological 3D-model for the Lower Main Plains Visualization and parameterization of important quaternary and tertiary units Easily comprehensible for external user Compatibility with existing 3D-models at the HLNUG Great benefit for daily business work Input Data: 20.000 project related wells 26 geological maps 1:25.000
Parameterization Permeability & Lithotypes Original Well Data Permeability Kf - value ~ 10-3 to 10-5 m/s ~ 10-1 to 10-2 m/s ~ 10-3 to 10-5 m/s ~ 10-1 to 10-2 m/s Lithotype F3 F1 F3 F1 ~ 10-5 to 10-6 m/s ~10-3 to 10-4 m/s F6 F2 ~ 10-5 to 10-6 m/s ~ 10-3 to 10-5 m/s F6 F3 Parameterization Generalization
Parameterization Surface Model &Test Area Lower Main Terrace Formations Upper (T1) Middle (T2-5) Lower (T6-7) Base Quarternary undifferentiated Base Pliocene Wiesbaden Frankfurt am Main Mainz Test Area
Components for the Interpolation Volume Grid of modelled Geobodies Parameterized Well Data Interpolation
Components for the Simulation Volume Grid of modelled Geobodies Lithotype Probabillity Maps Parameterized Well Data Vertical Lithotype Proportion Curves (VLPC) Truncated Gaussian Simulation
Results Overview
Results Cross Section W-E Depth (m NN) 200 W E 150 100 50 0-50 1 km Lithotype F1 F2 F3 F4 F5 F6 F7 permeable impermeable
Results Cross Section W-E Depth (m NN) 200 W E 150 100 T6-7 Lower Main Terrace Formation T2-5 50 0 T1 Pliocene limnic - fluviatile -50 1 km permeable Lithotype F1 F2 F3 F4 F5 F6 F7 impermeable Surface Model
Results Cross Section N-S 200 Depth (m NN) N S 150 100 50 0-50 1 km Lithotype F1 F2 F3 F4 F5 F6 F7 permeable impermeable
Results Cross Section N-S 200 Depth (m NN) N S 150 Lower Main Terrace Formation 100 T6-7 T2-5 T1 50 Pliocene limnic - fluviatil 0-50 1 km Lithotype F1 F2 F3 F4 F5 F6 F7 Surface Model permeable impermeable
Conclusions & Outlook Parameterization of geobodies is a helpful tool to extend the applicability of geological 3D-models Trend maps and VLPC can be used as secondary data if: Uneven distribution of input data leads to poor results in interpolation Sharp facies boundaries can be observed in the study area Geological knowledge is not sufficiently represented in the input data (e.g. more data points for unconsolidated rocks) Further analyses will reveal whether structures like fluvial channels become visible during parameterization Better understanding of the depositional environment Refinement of the conceptual model
Many thanks for your attention! References: Garling, F., & Dittrich, J (1979): Hydrogeologie - Gesteinsbemusterung, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig. Krimm, J.(2015): Methodischer Vergleich von 2D- und 3D-Modellierungswerkzeugen zur Interpolation von Lockergesteinsparametern in einem hochauflösenden geologischen 3D-Modell als Basis für eine numerische Grundwassersimulation Fallbeispiel Babenhausen, Masterthesis, Technische Universität Darmstadt. (unpublished). Radtke, G. (2009):Erläuterungen zur Geologischen Karte von Hessen 1:25.000, Blatt 5817 Frankfurt a. M. West. Hess. Landesamt für Umwelt und Geologie, Wiesbaden.