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Thermal evolution of the intracratonic Paris Basin: Insights from 3D basin modelling

机译：跨读气巴黎盆地的热演变：3D盆地建模的见解

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摘要

The thermal evolution of the Paris Basin (PB) has been widely studied using 1D, 2D and, more rarely, 3D thermal models. It is well documented that the PB experienced higher temperatures in the past compared to what is currently observed. However, a quantitative analysis of the main processes and parameters that affect the temperature distribution, at the basin scale and over time, is still not available. In this study, through basin modeling which accounts for the main processes of the thermal evolution of sedimentary basins, we analyze and quantify the role of the different geological mechanisms by discriminating the causes of abnormal temperatures during the Late Mesozoic. This is done with a 3D basin model built from base Moho to present-day topography using the TemisFlow (R) basin modelling software. The model includes thermal processes within an evolving upper crust defined by three main structural domains. Each crustal sector presents radiogenic heat production, conductivity and thickness values which are used as input parameters to reproduce the paleo- and present-day basal heat flow variations observed in the basin. The model calculates heat flow through time in both, crust and sedimentary column where the crust is coupled with the geological evolution of the basin. This approach allows estimating the eroded thickness during the main Tertiary uplift event and therefore the maximum temperature in the Late Cretaceous. The model is constrained by different types of paleo-thermo-chronometers and by 52 wells that are regionally distributed over the entire basin, resulting in a new regional thermal history of the PB. The amount of missing section in the Cretaceous chalk which mainly affected the eastern part of the basin is increased by up to 500m compared with previous studies and constitutes the key controlling factor of the temperature evolution. This new regional thermal history of the Paris Basin may be important for further analysis of the HC generation from the Lower Jurassic Toarcian source-rock and bring new insights into the geothermal potential of the basin.
机译：巴黎盆地（PB）的热量进变已广泛使用1D，2D，更罕见的3D热模型研究。有充分记录的是，与目前观察到的内容相比，PB在过去经历了更高的温度。然而，在盆地和随着时间的推移时，对影响温度分布的主要过程和参数的定量分析仍然不可用。在本研究中，通过盆地建模，该盆地模型占沉积盆地热演化的主要过程，我们通过区分中生代后期异常温度的原因来分析和量化不同地质机制的作用。这是通过由基本Moho建造的3D盆模型来实现使用TemisFlow（R）盆地建模软件的日期地形。该模型包括由三个主要结构域限定的演进式上皮内的热处理。每个地壳扇区都呈现辐射性热量生产，导电性和厚度值，其用作再现在盆地中观察到的古和现在的基础热流变化。该模型通过地壳与盆地的地质演变相结合的地壳和沉积柱中的热流通过时间。这种方法允许在主要三级隆起事件期间估计腐蚀的厚度，因此在后期白垩纪中的最高温度。该模型受到不同类型的古热 - 计量计和52个孔，其在整个盆地上分布，导致PB的新区域热历史。与以往的研究相比，白垩纪粉笔缺失部分的数量主要影响到盆地东部的盆地的缺失部分增加了500米，并构成了温度演化的关键控制因子。这种巴黎盆地的新区域热历史对于进一步分析来自下侏罗纪传奇源岩的HC生成可能是重要的，并将新的见解纳入盆地的地热潜力。

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