Study of void space structure and its influence on carbonate reservoir properties: X-ray microtomography, electron microscopy, and well testing

Martyushev, Dmitriy A.; Ponomareva, Inna N.; Chukhlov, Andrey S.; Davoodi, Shadfar; Osovetsky, Boris; Казымов, К. П.; Yang, Yongfei

doi:10.1016/j.marpetgeo.2023.106192

Cited by 32 publications

(15 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported, the adsorption methane density could reach 2–7 times the bulk density, and the magnitude continues to rise by intensifying molecule–surface interactions. ,,, Hence, from theoretical perspective, ultra-tight formations possess the advantage over traditional geological sites on storing more CO 2 due to the presence of the adsorption phase. Currently, related research on CO 2 sequestration in ultra-tight formations is heat; however, microscopic characterization on CO 2 behavior inside nanopores, ,,− like quantified description of adsorption phase density and thickness as well as the magnitude on CO 2 storage quantity the nanopores could improve over macropores, remains a challenging knowledge gap. ,,− Effective evaluation on CO 2 sequestration in ultra-tight formations cannot be accomplished favorably until figuring out the nanoconfined CO 2 behavior and its comprehensive relevant sensitivity analysis.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Storage Behavior in Nanopores: Implications for CO₂ Sequestration in Ultra-Tight Geological Formations

Huang

Lü

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The fatal challenge that human beings are currently facing is global warming as a result of excessive CO 2 emission in the atmosphere. CO 2 sequestration, gaseous CO 2 injection into ultra-tight geological sites, is regarded as a promising approach to achieve CO 2 reduction substantially. In this work, emphasis is paid to CO 2 storage potential inside depleted shale or coal seam where the presence of nanopores is rich, and CO 2 molecules store in both bulk and adsorption states in nanopores. The microscopic characterization on CO 2 behavior in the nanospace, particularly quantitative description on the difference between CO 2 in the adsorption and bulk states, is still lacking. With the intention to shed light on nanoconfined CO 2 behavior, a simple yet robust theoretical work rooting in the chemical potential equilibrium of each CO 2 molecule in the entire system is implemented, and the shift of critical properties due to the nanoconfinement effect is coupled. Then, the CO 2 density can be described as a function of distance away from the nanopore wall; the CO 2 molecule is found to accumulate more densely while approaching the nanopore wall, suggesting an adsorption behavior from microscopic perspective. Results show that (a) the CO 2 adsorption-phase thickness is insensitive to nanopore size, ranging from 0.58 to 0.64 nm, and the ratio of adsorption density over bulk density could reach 1−2 orders of magnitude; (b) the CO 2 amount the 2 nm nanopore is able to store could reach over 7.2 times that in macropores, displaying the unique advantage of shale and coal formations on CO 2 sequestration over conventional oil/gas reservoirs; (c) increasing pressure can improve the total CO 2 geological sequestration performance, and the improvement of magnitude at the lowpressure range could be as great as 2.9 times that at a high-pressure range. This work provides a doable framework to investigate the CO 2 existence behavior in nanopores, enriching the theoretical basis to identify favorable geological sites for CO 2 sequestration.

show abstract

Section: Introductionmentioning

confidence: 99%

CO₂ Storage Behavior in Nanopores: Implications for CO₂ Sequestration in Ultra-Tight Geological Formations

Huang

Lü

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The inherent mechanism behind this phenomenon is that the molecule–surface interaction strength is far greater than the intermolecular interaction strength. As reported, thickness of the adsorption phase CO 2 ranges from 0.4–0.8 nm, nearly 1–2 times the CO 2 molecular diameter. ,,, From the theoretical angle, the origin for the formation of the adsorption phase is the molecule–surface interactions. Therefore, manipulating molecule–surface interaction strength, like modifying the surface compositions, adding specified atoms on the surface, or reducing the distance between surface and molecules, is capable of varying CO 2 behavior in nanopores. , As for the CO 2 geological sequestration, we always pursue the purpose of advancing the storage capacity of the found geological site.…”

Section: Introductionmentioning

confidence: 85%

“…As reported, thickness of the adsorption phase CO 2 ranges from 0.4−0.8 nm, nearly 1−2 times the CO 2 molecular diameter. 16,17,64,65 From the theoretical angle, the origin for the formation of the adsorption phase is the molecule−surface interactions. Therefore, manipulating molecule−surface interaction strength, like modifying the surface compositions, adding specified atoms on the surface, or reducing the distance between surface and molecules, is capable of varying CO 2 behavior in nanopores.…”

Section: Introductionmentioning

confidence: 99%

Surface-Molecule Interaction Strength on CO₂ Adsorption Capacity in Nanopores: Implications to Advance CO₂ Sequestration Performance

Sun,

Wu,

Huang

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

“…However, these processes often led to increased uncertainty (Table ). Compared with sandstone, carbonate rocks are usually porous media − and exhibit more complex characteristics, and the reservoir storage space is composed of pores, caves, and fractures of different sizes, showing strong heterogeneity. − The study of DLOAs presents great challenges for oil accumulation in deep carbonate rocks.…”

Section: Introductionmentioning

confidence: 99%

Critical Condition of the Depth Limit of Oil Accumulation of Carbonate Reservoirs and Its Exploration Significance in the Lower Ordovician of the Tazhong Area in the Tarim Basin

Wang,

Pang,

Wang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

Carbonate rocks typically constitute porous media, making the study of hydrocarbon accumulation in carbonate reservoirs an essential area of research. In the Tazhong area of the Tarim Basin, specifically within the Lower Ordovician stratum exceeding 7000 m, effective reservoirs and industrial liquid hydrocarbon accumulations persist. However, the existence of a depth limit of oil accumulation (DLOA) for oil accumulation in carbonate reservoirs remains unclear, posing a challenge for explorers. This study quantitatively characterizes the critical condition of DLOA in deep carbonate reservoirs from the perspective of hydrocarbon accumulation dynamics. Through comprehensive experimental analysis, statistical assessments, and numerical simulations, it also forecasts the potential for deep oil exploration. Based on the results of mercury injection experiments on 350 carbonate rock cores collected from 19 drilling wells in the deep Lower Ordovician, it was found that the reservoir is compact and exhibits significant heterogeneity. The driving force for oil accumulation is the capillary pressure difference between the surrounding rock and the reservoir. A greater capillary pressure difference indicates improved oil-bearing properties within the reservoir. When the capillary pressure difference between the reservoir and surrounding rock reaches zero, oil accumulation cannot occur, marking the critical condition of DLOA. The critical pore throat radius for DLOA in the deep Lower Ordovician carbonate rocks in the Tazhong area of the Tarim Basin is determined to be 0.01 μm, and the DLOA is estimated at 9000 m. This study confirms that the maximum depth for the embedded Lower Ordovician carbonate reservoir in the Tazhong area does not surpass this limit. Consequently, oil exploration in deep carbonate rocks within this stratum is both feasible and promising. The findings from this study hold significant importance in scientifically predicting favorable areas for oil exploitation in deep layers and offer valuable insights into understanding the oil flow in carbonate rocks.

show abstract

Study of void space structure and its influence on carbonate reservoir properties: X-ray microtomography, electron microscopy, and well testing

Cited by 32 publications

References 50 publications

CO₂ Storage Behavior in Nanopores: Implications for CO₂ Sequestration in Ultra-Tight Geological Formations

CO₂ Storage Behavior in Nanopores: Implications for CO₂ Sequestration in Ultra-Tight Geological Formations

Surface-Molecule Interaction Strength on CO₂ Adsorption Capacity in Nanopores: Implications to Advance CO₂ Sequestration Performance

Critical Condition of the Depth Limit of Oil Accumulation of Carbonate Reservoirs and Its Exploration Significance in the Lower Ordovician of the Tazhong Area in the Tarim Basin

Contact Info

Product

Resources

About

Study of void space structure and its influence on carbonate reservoir properties: X-ray microtomography, electron microscopy, and well testing

Cited by 32 publications

References 50 publications

CO2 Storage Behavior in Nanopores: Implications for CO2 Sequestration in Ultra-Tight Geological Formations

CO2 Storage Behavior in Nanopores: Implications for CO2 Sequestration in Ultra-Tight Geological Formations

Surface-Molecule Interaction Strength on CO2 Adsorption Capacity in Nanopores: Implications to Advance CO2 Sequestration Performance

Critical Condition of the Depth Limit of Oil Accumulation of Carbonate Reservoirs and Its Exploration Significance in the Lower Ordovician of the Tazhong Area in the Tarim Basin

Contact Info

Product

Resources

About

CO₂ Storage Behavior in Nanopores: Implications for CO₂ Sequestration in Ultra-Tight Geological Formations

CO₂ Storage Behavior in Nanopores: Implications for CO₂ Sequestration in Ultra-Tight Geological Formations

Surface-Molecule Interaction Strength on CO₂ Adsorption Capacity in Nanopores: Implications to Advance CO₂ Sequestration Performance