Multiscale characterization of shale pore-fracture system: Geological controls on gas transport and pore size classification in shale reservoirs

被引:61
作者
Chen, Yufei [1 ,2 ]
Jiang, Changbao [1 ]
Leung, Juliana Y. [2 ]
Wojtanowicz, Andrew K. [3 ]
Zhang, Dongming [1 ]
机构
[1] Chongqing Univ, Sch Resources & Safety Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400030, Peoples R China
[2] Univ Alberta, Sch Min & Petr Engn, Dept Civil & Environm Engn, Edmonton, AB T6G 1H9, Canada
[3] Louisiana State Univ, Craft & Hawkins Dept Petr Engn, Baton Rouge, LA 70803 USA
基金
中国国家自然科学基金;
关键词
Gas shale; Pore size classification; Pore size distribution; Multiscale characterization; Gas transport mechanisms; Pore-fracture; NUCLEAR-MAGNETIC-RESONANCE; ORGANIC-RICH SHALES; HIGH THERMAL MATURITY; SICHUAN BASIN; ELECTRON-MICROSCOPY; MERCURY INTRUSION; LONGMAXI SHALE; MATRIX SYSTEM; POROUS-MEDIA; ADSORPTION;
D O I
10.1016/j.petrol.2021.108442
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A sound understanding of the pore-fracture system across all scales provides an in-depth look at the intricate gas transport mechanisms in shale reservoirs. We performed a comprehensive multiscale characterization analysis on the Longmaxi shale samples using five complementary techniques: low-temperature gas (N2) adsorption (LTGA), mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), field emission scanning electron microscopy (FE-SEM), and X-ray computed tomography (CT) scanning. For pore size distribution (PSD) determination, LTGA (N2) analysis can detect small pores (2?300 nm sized), while MIP analysis is suitable for large pores or fractures ( 1000 nm), and seepage pores or fracture-pores (pore size 1000 nm). Although slippage pores dominate in terms of the total volumetric contribution of the Longmaxi shale, with a clear presence of adsorption pores, overall gas transport in shale is predominantly controlled by the seepage pores (fracture-pores), which constitute a very small portion of the total volume.
引用
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页数:18
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