Discrete fracture network modelling reconstructs fracture array evolution and related petrophysical properties over geological time

Communications Earth & Environment, Год журнала: 2025, Номер 6(1)

Опубликована: Март 5, 2025

Язык: Английский

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Diagenesis is key to unlocking outcrop fracture data suitable for quantitative extrapolation to geothermal targets

Frontiers in Earth Science, Год журнала: 2025, Номер 13

Опубликована: Апрель 2, 2025

Exceptionally large, well-exposed sandstone outcrops in New York provide insights into folds, deformation bands, and fractures that could influence permeability, heat exchange, stimulation outcomes of geothermal reservoir targets. Cambrian Potsdam Sandstone with <5% porosity contains decimeter-scale open, angular-limbed monoclines <0.5 km apart associated low-porosity mm-wide cataclastic bands. Crossing abutting relationships among sub-vertical opening-mode show four chronological Sets A–D, striking NNW, NE, NW, ENE, respectively. Fracture lengths heights range from millimeters to tens meters. A C macro-fractures, possibly B D, contain quartz deposits. All sets have abundant cemented microfractures also record set orientations crosscutting relations. Quartz cement deposits—evidence diagenesis—are the key identifying attributes outcrop suitable for extrapolation targets sandstones because they which formed subsurface. Set fluid inclusion homogenization temperatures (120°C–129°C) are compatible fracture at >3 depth. Fractures stiff those ≥0.05 mm (Set C) ≥0.1 A) open potentially conducive flow. D close spacing—0.18 m 0.68 m, respectively—and define a rectangular connectivity network dominated by crossing X Y nodes. aperture distributions follow power law slope −0.8 up 0.15 mm; other lognormal distributions. weakly clustered, while macro-fractures commonly 1D anticlustered (regular or periodic) arrangements shorter length scales (<0.2 m). Sub-horizontal barren may near surface. heights, lengths, spatial good trace but low connectivity. For applications, results predict initial well-test permeabilities owing disconnecting fractures, closely spaced partly yield high surface area exchange. Quantitative like abundance, orientation, arrangement, length, is possible fractured reservoirs if differing thermal histories diagenesis accounted for.

Язык: Английский

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The characterization of fractures and analysis of hydraulic properties in granite-type hot dry rock reservoirs

Geothermics, Год журнала: 2025, Номер 130, С. 103342 - 103342

Опубликована: Апрель 14, 2025

Язык: Английский

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Experimental Study on Pore Structure Quantitative Characterization and Enhanced Oil Recovery During Air/CO₂ Flooding of Shale Reservoir With Online NMR

Geofluids, Год журнала: 2025, Номер 2025(1)

Опубликована: Янв. 1, 2025

Injecting air or CO 2 into shale reservoirs can significantly enhance oil recovery (EOR) following the initial depletion. However, effectively characterizing complex pore structure of poses a challenge, leading to an incomplete understanding seepage mechanism and microscopic production characteristics air/CO flooding at different scales. In this study, we characterized through reconstruction visual quantitative digital cores in multiple dimensions. Subsequently, online nuclear magnetic resonance (NMR) experiments were conducted, influencing factors crude quantitatively studied. The results show that connectivity are highly intricate deterioration reservoir physical properties correlates with decreasing trend pore‐throat coordination numbers heterogeneity. Shale primarily occurs three types pores (< 0.1, 0.1–1, 1–10 μ m), improving micronanopore is urgent for EOR. Crude observed during molecule generation low‐temperature oxidation (LTO) reaction. Additionally, accelerates mass transfer gas extraction molecular diffusion effects, substantially recovery; however, significant differences exist flooding. High‐oxygen‐concentration high‐pressure proves beneficial EOR, especially small macropores, which contribute 45.75%–53.42% recovery. This study provides scientific theoretical support clarifying efficient development oil.

Язык: Английский

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Unbiased statistical length analysis of linear features: adapting survival analysis to geological applications

Solid Earth, Год журнала: 2025, Номер 16(4/5), С. 367 - 390

Опубликована: Май 15, 2025

Abstract. A proper quantitative statistical characterization of fracture length or height is paramount importance when analysing outcrops fractured rocks. Past literature suggests adopting a non-parametric approach, such as circular scanlines, for the unbiased estimation fracture-length mean value. This due to fact that, in past, estimating any type distribution was difficult and there no real interest defining precise parametrical models. However, recent rise popularity digital outcrop models (DOMs) stochastic discrete networks (DFNs), an increasing demand distribution-based solutions that output correct parameters given proposed model (e.g. standard deviation). change highlights geological absence properly structured theoretical works on this topic. Our methodology, presented first time contribution, represents powerful alternative non-parametrical methods, aimed at specifically treating censoring bias obtaining trace-length model. As our objective, we propose tackle by applying survival analysis techniques: branch statistics focused modelling time-to-event data correctly with affected censoring. second novel approach selecting most representative parametric We combine direct visual calculation four quantify how well reflect data. apply estimate censored dataset three different case studies show effects percentage estimations do not use paradigm. The analyses are carried out using open-source Python package called FracAbility, which purposefully created carry described workflow (https://github.com/gecos-lab/FracAbility, last access: 8 September 2024).

Язык: Английский

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Using digital cores and nuclear magnetic resonance to study pore-fracture structure and fluid mobility in tight volcanic rock reservoirs

Journal of Asian Earth Sciences, Год журнала: 2023, Номер 259, С. 105890 - 105890

Опубликована: Окт. 20, 2023

Язык: Английский

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Introducing standardized field methods for fracture-focused surface process research

Earth Surface Dynamics, Год журнала: 2024, Номер 12(1), С. 35 - 66

Опубликована: Янв. 5, 2024

Abstract. Rock fractures are a key contributor to broad array of Earth surface processes due their direct control on rock strength as well porosity and permeability. However, date, there has been no standardization for the quantification in process research. In this work, case is made within fracture-focused research, prior work reviewed identify various datasets methodologies. Then, suite standardized methods presented starting “baseline” fracture-based research studies. These have shown pre-existing from structural geology, geotechnical engineering, disciplines comprise best practices characterization clasts outcrops. This practical, accessible, detailed guide can be readily employed across all weathering geomorphology applications. The wide adoption baseline data collected using same will enable comparison compilation among studies globally ultimately lead better understanding links feedbacks between fracture landscape evolution.

Язык: Английский

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Multiscale spatial analysis of fracture nodes in two dimensions

Marine and Petroleum Geology, Год журнала: 2023, Номер 149, С. 106093 - 106093

Опубликована: Янв. 5, 2023

Язык: Английский

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Stochastic reconstruction of fracture network pattern using spatial point processes

Geoenergy Science and Engineering, Год журнала: 2024, Номер 236, С. 212741 - 212741

Опубликована: Фев. 29, 2024

Язык: Английский

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Fluid flow and solute transport simulations in tight geologic formations: Discrete fracture network and continuous time random walk analyses

Journal of Hydrology, Год журнала: 2024, Номер 635, С. 131109 - 131109

Опубликована: Март 24, 2024

Язык: Английский

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