Naturally fractured reservoir characterization in heterogeneous sandstones: insight for Uranium In Situ Recovery (Imouraren, Niger)

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Solid Earth Pub Date : 2024-02-15 DOI:10.5194/egusphere-2024-435
Maxime Jamet, Gregory Ballas, Roger Soliva, Olivier Gerbeaud, Thierry Lefebvre, Christine Leredde, Didier Loggia
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Abstract

Abstract. This study delves into the characterization of a complex reservoir, the Tchirezrine II sandstone unit in North Niger, crucial for potential Uranium In Situ Recovery (ISR) in a naturally fractured and faulted context. Employing a multifaceted approach, including well log data, optical borehole imagery, and hydrogeological tests, alongside satellite-based lineament analysis, this study provides a comprehensive understanding of the structures and its impact on fluid flow. Lineament analysis reveals scale-dependent patterns, consistent with spatially homogeneous joint networks restricted to mechanical units, as well as nearly scale-invariant patterns, better corresponding to spatially heterogeneous fault networks. Various deformation structures are detected from borehole imagery, including Mode I fractures, cataclastic deformation bands, and brecciated-cataclastic fault cores. The Tchirezrine II reservoir displays heterogeneous porosity and permeability related to its fluviatile sedimentary context. These data differ from traditional porosity-permeability relationship obtained in sandstone reservoir matrix but are instead consistent with Nelson’s classification, emphasizing the impact of deformation structures on such petrophysical properties. Hydrological tests have been implemented into a zone of E-W trending deformation structures, revealing a strong permeability anisotropy of this heterogeneity. This strong E-W anisotropy is consistent with the presence of the observed E-W structures, i.e. with a drain behaviour of Mode I open fractures and a sealing behaviour of both cataclastic bands and fault rocks. Considering implications for ISR mining, this study allows discussing the interplay between fractures, faults, and fluid flow properties. It suggests that a well pattern perpendicular to the main permeability orientation can attenuate channelled flow, thus improving contact of the leach solution with the mineralized matrix. These results provide an integrated approach and multi-scale characterization of Naturally Fractured Reservoir (NFR) properties in sandstone, offering a basis for optimization of NFR production such as ISR development.
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异质砂岩中天然裂缝储层的特征:对铀原位采收的启示(尼日尔伊莫拉伦)
摘要本研究深入探讨了尼日尔北部 Tchirezrine II 砂岩单元这一复杂储层的特征,这对于在自然断裂和断层背景下进行潜在的铀原位采收(ISR)至关重要。这项研究采用了多方面的方法,包括测井数据、井眼光学图像和水文地质测试,以及基于卫星的线状分析,全面了解了结构及其对流体流动的影响。线状分析揭示了与尺度相关的模式,与局限于力学单元的空间均质联合网络相一致,同时也揭示了几乎与尺度无关的模式,更符合空间异质断层网络。从钻孔图像中探测到了各种变形结构,包括模式 I 断裂、碎屑岩变形带和碎屑-碎屑岩断层核心。Tchirezrine II 储层显示出与其流化沉积背景相关的异质性孔隙度和渗透率。这些数据不同于在砂岩储层基质中获得的传统孔隙度-渗透率关系,而是与纳尔逊分类法一致,强调了变形结构对此类岩石物理特性的影响。在 E-W 向变形结构区进行了水文测验,发现这种异质性具有很强的渗透率各向异性。这种强烈的 E-W 向各向异性与观测到的 E-W 结构的存在是一致的,即与模式 I 开口裂缝的排泄行为以及 cataclastic 带和断层岩的密封行为是一致的。考虑到对 ISR 采矿的影响,这项研究有助于讨论断裂、断层和流体流动特性之间的相互作用。研究表明,垂直于主要渗透方向的井型可以减弱导流,从而改善浸出液与矿化基质的接触。这些结果提供了一种综合方法和砂岩天然裂缝储层(NFR)特性的多尺度表征,为优化天然裂缝储层生产(如 ISR 开发)提供了基础。
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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