136-12 The Pore-Fracture Evolution and Fluid Transport Behavior in Terrestrial Shales under In-Situ Subsurface Conditions
Session: Micro-Nano Scale Pore-Fracture Architecture and Fluid Dynamics in Shale and Coal Reservoirs
Presenting Author:
Yue JiaoAuthors:
Jiao, Yue1, Bai, Bin2, Liu, Chang3, Ma, Lin4, Hou, Xiulin5(1) Research Institute of Petroleum Exploration and Development, Beijing, China, (2) Research Institute of Petroleum Exploration and Development, Beijing, China, (3) Research Institute of Petroleum Exploration and Development, Beijing, China, (4) The University of Manchester, Manchester, United Kingdom, (5) Research Institute of Petroleum Exploration and Development, Beijing, China,
Abstract:
To visualize and evaluate the effectiveness of shale bedding fractures under subsurface temperature and pressure conditions, dynamic experiments and simulations on shale samples are required. Micrometer-Computerized Tomography (μm-CT) technology was utilized to conduct high-resolution in-situ four-dimensional image characterization on selected samples under varying temperatures and pressures, enabling quantitative and comparative analysis of changes in the pore-fracture networks. By simulating the interaction between subsurface fluids and the pore-fracture system, the behavior of shale oil under realistic subsurface temperature and pressure conditions is predicted. During heating, the volume of organic pores and fractures in organic-rich shale increases, but stabilizes beyond a certain temperature. Under pressurization, longitudinal fractures in shale samples gradually decrease, while transverse fractures first expand and then shrink. Samples with higher brittle mineral content may generate new fractures during pressurization, leading to fluctuations in the total fracture volume, though the overall trend is a reduction. Shale permeability exhibits anisotropy and generally decreases with increasing pressure. The permeability remains largely unchanged under brine and CO2 injection conditions. These findings provide a critical foundation for advancing theories on shale fluids prediction and enhance the evaluation of reservoir space distribution and connectivity under realistic geological conditions.
Key words: organic-rich shale, μm CT technology; shale pore-fracture networks; in-situ four-dimensional imaging characterization; fluid behaviour evaluation
Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025
doi: 10.1130/abs/2025AM-9765
© Copyright 2025 The Geological Society of America (GSA), all rights reserved.
The Pore-Fracture Evolution and Fluid Transport Behavior in Terrestrial Shales under In-Situ Subsurface Conditions
Category
Topical Sessions
Description
Session Format: Oral
Presentation Date: 10/20/2025
Presentation Start Time: 04:35 PM
Presentation Room: HBGCC, 302C
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