Results of a 3D facies modelling attempt in the Lower Main Plains (Frankfurt, Germany)

Transcription

1 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

2 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: ; Topographische Grundkarte Hessen 1:

3 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: project related wells 26 geological maps 1:25.000

4 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

5 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: project related wells 26 geological maps 1:25.000

6 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

7 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

8 Components for the Interpolation Volume Grid of modelled Geobodies Parameterized Well Data Interpolation

9 Components for the Simulation Volume Grid of modelled Geobodies Lithotype Probabillity Maps Parameterized Well Data Vertical Lithotype Proportion Curves (VLPC) Truncated Gaussian Simulation

10 Results Overview

11 Results Cross Section W-E Depth (m NN) 200 W E km Lithotype F1 F2 F3 F4 F5 F6 F7 permeable impermeable

12 Results Cross Section W-E Depth (m NN) 200 W E T6-7 Lower Main Terrace Formation T T1 Pliocene limnic - fluviatile km permeable Lithotype F1 F2 F3 F4 F5 F6 F7 impermeable Surface Model

13 Results Cross Section N-S 200 Depth (m NN) N S km Lithotype F1 F2 F3 F4 F5 F6 F7 permeable impermeable

14 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 km Lithotype F1 F2 F3 F4 F5 F6 F7 Surface Model permeable impermeable

15 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

16 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.

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