Nano-CT measurement of pore-fracture evolution and diffusion transport induced by fracturing in medium-high rank coal

Jia, Qifeng; Liu, Dameng; Cai, Yidong; Lu, Yuejian; Li, Rui; Wu, Hui; Zhou, Yingfang

doi:10.1016/j.jngse.2022.104769

Cited by 9 publications

(3 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main type of reservoir space is secondary pore, which mainly includes intragranular dissolution pores, intergranular dissolution pores, and microcracks. The feldspar-rich sandy conglomerate shows large-scale dissolution [27,28].…”

Section: Reservoir Physical Property Characteristics In the Mahumentioning

confidence: 99%

Study the Elastic Parameters of Sandy Conglomerate under Different Burial History and Petrophysical Modeling

et al. 2023

View full text Add to dashboard Cite

Over the past few years, significant exploration breakthroughs have been made in the sandy conglomerates reservoir of the Triassic Baikouquan Formation in the Mahu Sag, Junggar Basin, China. However, the elasticity and pore characteristics of the tight sandy conglomerates reservoir in this area are still unclear. Through a systematic sonic testing program of the sandy conglomerates sample collected from the Mahu Sag, the regularity behind the variation of the elasticity and pore characteristics of the sample has been analyzed and captured. The Triassic Baikouquan Formation of the slope of Mahu Sag has been through complex burial and diagenetic history. The compaction, cementation, and dissolution are the three types of diagenesis that have the greatest impact on pore characteristics in the study area. In order to quantitatively describe the influence of this complex burial and diagenetic history, we present a rock-physics modeling approach to describe the elastic properties of sandy conglomerate sample. The overall strategy of the modeling is to combine the contact cement theory (CCT), differential effective medium (DEM) and the upper Hashin-Shtrikman bound. The CCT model can well describe the history of cementation, DEM model is suitable for the history of dissolution, and HS upper bound is used to describe the history of compaction. Then, the model is used to describe well log data from sandy conglomerates reservoirs in Mahu Sag and successfully explain the rock porosity, pore shape trends, and the elasticity in the sandy conglomerate reservoirs.

show abstract

Section: Reservoir Physical Property Characteristics In the Mahumentioning

confidence: 99%

Study the Elastic Parameters of Sandy Conglomerate under Different Burial History and Petrophysical Modeling

et al. 2023

View full text Add to dashboard Cite

show abstract

“…20 In medium-and high-rank coals, the fluid pressure is more likely to reach equilibrium if differences among pressure in the X, Y, and Z directions are not large. 21 Additionally, hydrate saturation affects the pore size distribution (PSD) and pore network connectivity in coal, 22 making the permeability of coal change. Generally, the gas-phase permeability tends to decrease with increasing hydrate saturation.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the shape factor of the pore decreases with an increasing pore diameter, suggesting that the larger the pores, the rougher the pore surface . In medium- and high-rank coals, the fluid pressure is more likely to reach equilibrium if differences among pressure in the X , Y , and Z directions are not large . Additionally, hydrate saturation affects the pore size distribution (PSD) and pore network connectivity in coal, making the permeability of coal change.…”

Section: Introductionmentioning

confidence: 99%

Novel Discrete Fracture Network Model for Multiphase Flow in Coal

Liu

Cai

et al. 2023

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Multiphase flow intensely affects the movement and accumulation of other fluids in coal and plays an essential role in predicting the permeability of coal during coalbed methane (CBM) production. Fractures have played a decisive role in the transport of CBM after hydraulic fracturing has occurred. In this study, a multiscale pore network model (PNM) was constructed on the basis of focused ion beam scanning electron microscopy (FIB-SEM) image results. Additionally, a novel discrete fracture network model, fracture–pore network model (F–PNM), was proposed to investigate the effect of fracture density, fracture developing direction, and wettability on multiphase flow. The results reveal that the permeability of F–PNM increases with the increase of the fracture density, which could be the result of the predominance of snap off. The permeability decreases as the angle between the fracture and flow direction increases; initially, the permeability decreases steeply and then it tends to remain stable; and for angles between 0° and 15°, the permeability decreased by as much as 61.8%. Moreover, the wettability of coal has limited impact on its water relative permeability; however, it has a measurable effect on gas relative permeability, which could be owing to water accumulation on the coal surface under different wettability conditions. A good wetting performance would have a negative effect on the CBM production and reduce flowback efficiency.

show abstract

Regulatory mechanism of microscopic pore structure on anisotropy of gas multimodal seepage in original coals

Guo,

Liu,

Zhang

et al. 2024

Energy

View full text Add to dashboard Cite

Nano-CT measurement of pore-fracture evolution and diffusion transport induced by fracturing in medium-high rank coal

Cited by 9 publications

References 89 publications

Study the Elastic Parameters of Sandy Conglomerate under Different Burial History and Petrophysical Modeling

Study the Elastic Parameters of Sandy Conglomerate under Different Burial History and Petrophysical Modeling

Novel Discrete Fracture Network Model for Multiphase Flow in Coal

Regulatory mechanism of microscopic pore structure on anisotropy of gas multimodal seepage in original coals

Contact Info

Product

Resources

About