沉积面、矿物学和成岩作用对德国西北部上石炭纪含煤储层性质的影响

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
J. Greve, Benjamin Busch, Dennis Quandt, Mathias Knaak, C. Hilgers
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引用次数: 0

摘要

德国西北部鲁尔盆地上石炭统粉砂和砂岩中的前煤矿目前正在进行开采后应用(如地热能源)的研究,同时也是重要的致密气储层类似物。对来自 Pelkum-1 号井的岩心材料进行了研究,其中包括威斯特伐利亚 A(巴什基尔)三角洲矿床。砂岩和粉砂岩总体上是致密的(平均孔隙度为 5.5%;平均渗透率为 0.26 mD)。储层性质较差主要是由于埋藏较深,韧性岩石碎片含量较高,造成了明显的机械压实(平均 COPL 38.8%)。砂岩(> 8 %;> 0.01 mD)储层性质较好的原因是:(1) 在机械压实过程中变形的韧性颗粒(< 38 %)含量较低;(2) 长石和不稳定岩石碎片含量较高。在埋藏过程中,有机质成熟产生的酸性孔隙水会形成次生孔隙度(> 1.5 %)。不过,由于自生粘土(即高岭石和伊利石)或晚期成岩碳酸盐(即菱铁矿和铁闪长岩/白云石)会堵塞次生孔隙,因此孔隙率增加的砂岩仅显示出少量的渗透性增加。石英胶结对储层性质的影响较小。评估硅/铝比率可作为评估晶粒尺寸的合适替代指标,并可作为进一步勘探的便利工具。 补充材料:https://doi.org/10.6084/m9.figshare.c.7003156
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The influence of sedimentary facies, mineralogy, and diagenesis on reservoir properties of the coal-bearing Upper Carboniferous of NW Germany
Former coal mines hosted in Upper Carboniferous silt- and sandstones in the Ruhr Basin, NW Germany, are currently examined for post-mining applications (e.g., geothermal energy) and are also important tight-gas reservoir analogs. Core material from well Pelkum-1, comprising Westphalian A (Bashkirian) delta deposits, was studied. The sandstones and siltstones are generally tight (mean porosity 5.5 %; mean permeability 0.26 mD). Poor reservoir properties primarily result from pronounced mechanical compaction (mean COPL 38.8 %) due to deep burial and high contents of ductile rock fragments. Better reservoir properties in sandstones (> 8 %; > 0.01 mD) are due to (1) lower volumes of ductile grains (< 38 %) that deform during mechanical compaction and (2) higher volumes in feldspar and unstable rock fragments. During burial these form secondary porosity (> 1.5 %) resulting from acidic pore water from organic matter maturation. Still, sandstones with enhanced porosities only show a small increase in permeability since authigenic clays (i.e., kaolinite and illite) or late diagenetic carbonates (i.e., siderite and ferroan dolomite/ankerite) clog secondary porosity. Quartz cementation has a minor impact on reservoir properties. Evaluating the Si/Al ratio can be a suitable proxy to assess grain sizes and may be a convenient tool for further exploration. Supplementary material: https://doi.org/10.6084/m9.figshare.c.7003156
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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