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首页> 外文OA文献 >Multi-scale 3D characterisation of porosity and organic matter in shales with variable TOC content and thermal maturity: Examples from the Lublin and Baltic Basins, Poland and Lithuania
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Multi-scale 3D characterisation of porosity and organic matter in shales with variable TOC content and thermal maturity: Examples from the Lublin and Baltic Basins, Poland and Lithuania

机译：具有可变TOC含量和热成熟度的页岩中孔隙度和有机质的多尺度三维表征：卢布林和波罗的海盆地，波兰和立陶宛的例子

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Understanding the distribution of pores and organic matter with varying organic matter concentrations and maturity is essential to understanding fluid flow in shale systems. Analysis of samples with low, medium, and high total organic carbon (TOC) and varying maturities (gas-mature and oil-mature) enables the impact of both organic matter concentrations and thermal maturation on organic matter porosity to be examined. Three gas-mature samples of varying TOC (Lublin Basin) and one oil-mature sample (Baltic Basin), both with similar mineral compositions, were selected from the same formation. Samples were imaged in 3D over four orders of magnitudes (pixel sizes from 44 μm to 5 nm). A combination of X-ray computed tomography (XCT) and Focus Ion Beam Scanning Electron Microscopy (FIB-SEM) enabled the morphologic and topological characteristics of minerals, organic matter and pores to be imaged and quantified.In the studied samples, organic matter primarily has two geometries: lamellar 25 masses (length: 1-100 μm, thickness: 0.5-2.0 μm) and discrete spheroidal particles (0.5-20.0 μm). Organic matter forms an inter-connected network where it exceeds a concentration between 6 and 18 wt%. Different pore types have different diameters and total pore volumes: inter-mineral pores (0.2 μm, 10-94 %), organic interface pores (0.2 μm, 2-77 %), intra-organic pores (0.05 μm, 1-40 %) and intra30 mineral pores (0.05 μm diameter, 1-2 % of total porosity). The major pore system in the studied shales is composed of inter-mineral pores which occur between clay mineral grains. TOC concentration influences the total volume of organic matter-related pores while maturity controls the presence of intra-organic pores. The study improves the understanding of the relationship of organic matter concentrations, maturity and pore systems in shales. This study characterises porosity and organic matter distributions in 3D; it also improves the understanding of the relationship of organic matter concentrations, maturity and pore systems in shales.
机译：了解页岩系统中流体的流动，了解有机物浓度和成熟度不同的孔隙和有机物的分布是必不可少的。对具有低，中和高总有机碳（TOC）以及不同成熟度（天然气成熟和石油成熟）的样品进行分析，可以检查有机物浓度和热成熟度对有机物孔隙率的影响。从相同的地层中选择了三个具有不同TOC的天然气成熟样品（卢布林盆地）和一个原油成熟的样品（波罗的海盆地）。样品在四个数量级（像素大小从44μm到5 nm）中以3D形式成像。 X射线计算机断层扫描（XCT）和聚焦离子束扫描电子显微镜（FIB-SEM）的结合使矿物质，有机物和孔的形态和拓扑特征得以成像和定量化。具有两种几何形状：层状25质量（长度：1-100μm，厚度：0.5-2.0μm）和离散的球形颗粒（0.5-20.0μm）。有机物形成相互连接的网络，在该网络中，有机物的浓度超过6至18 wt％。不同的孔类型具有不同的直径和总孔体积：矿物间孔（0.2μm，10-94％），有机界面孔（0.2μm，2-77％），有机内孔（0.05μm，1-40％） ）和内部30个矿物孔隙（直径0.05微米，占总孔隙度的1-2％）。研究页岩中的主要孔隙系统是由矿物矿物之间的矿物间孔隙组成。 TOC浓度影响与有机物有关的孔的总体积，而成熟度则控制有机体内孔的存在。该研究提高了对页岩中有机质浓度，成熟度和孔隙系统之间关系的理解。这项研究表征了3D中的孔隙度和有机质分布；它也增进了对页岩中有机质浓度，成熟度和孔隙系统之间关系的理解。

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