Quantitative Characterization of the Lower Limit of the Physical Properties of Tight Oil Reservoirs in Nano-Material Porous Media

Li, Jiajing; Fu, Guang; Liu, Zhe

doi:10.1080/10584587.2022.2072118

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…The multiphase flow in the tiny pore-throat units features low Reynolds and capillary numbers. Consequently, the wettability of the pore wall has a remarkable influence on the peeling-off, transportation, and morphology of crude oil in the matrix. − Thus, reservoir wettability is a crucial parameter in oil development …”

Section: Introductionmentioning

confidence: 99%

Microscale Reservoir Wettability Evaluation Based on Oil–Rock Nanomechanics

Luo

Chu

et al. 2023

Energy Fuels

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Low oil production and rapid production decline epitomize the challenges of unconventional reservoir development. Rocks in the formation with micro-/nanoscale pore-throat units possess an immense surface area. Consequently, the wettability of rocks plays a crucial role in the relative permeability of oil/water, the injection pressure, the distribution and morphology of residual oil, and hence the ultimate oil recovery. Contact angle, as a frequently used method to evaluate wettability, is susceptible to oil-water saturation, imbibition, and surface roughness of rock slices. In addition, the measurement scale (droplet of several millimeters) does not match the flow scale (pore units in micro-or nanoscale). Therefore, this paper established a new wettability evaluation method based on oil−rock interaction. Molecular dynamics simulation results demonstrated that the interaction energy between the oil molecule and walls with different wettabilities shows a distinct discrepancy. Accordingly, nanomechanics by AFM was utilized to measure the oil molecule−pore wall interaction force. It was found that the interaction force increases with the augmented hydrophobicity of the pore wall due to hydrophobic force. In addition, the reservoir rock wettability index was defined using the oil−rock interaction force in the nanoscale. The wettability index has an excellent linear correlation with the intrinsic contact angle. The wettability evaluation method based on the oil−rock interaction force is more direct, facile, and rapid and overcomes the limitation of the traditional contact angle method.

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Section: Introductionmentioning

confidence: 99%

Microscale Reservoir Wettability Evaluation Based on Oil–Rock Nanomechanics

Luo

Chu

et al. 2023

Energy Fuels

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“…Since the discovery of tight hydrocarbon energy in Bakken, Eagle Beach, and other areas in the USA and North America, tight oil has emerged as an important hot spot in the oil exploration industry (He et al, 2018;James et al, 1983;Jiang and Mokhtari, 2019;Lin et al, 2011;Miller et al, 2008). Tight oil reservoirs are often characterized by low porosity and ultra-low permeability, severely restricting the pace of tight oil as well as gas exploration and development (Jia et al, 2012a;Shan et al, 2017;Hou et al, 2018;Li et al, 2022). Therefore, finding a reservoir 'sweet spot' suitable for oil and gas production is quintessential.…”

Section: Introductionmentioning

confidence: 99%

Reservoir characteristics and factors influencing shahejie marl in the shulu sag, bohai bay basin, eastern China

Fu²,

Zhu³

et al. 2022

Front. Earth Sci.

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Shahejie marl in the Shulu Sag is a crucial resource for unconventional hydrocarbon exploration in China. Although breakthroughs have been made in tight oil exploration in this area, the mechanisms underlying the formation of this marl reservoir and factors controlling its ‘sweet spots’ have not been thoroughly studied. To understand the pore structure characteristics and factors influencing the marl reservoir, we analyzed core samples from Wells ST1 and ST3. A series of experiments was conducted on the samples, such as X-ray diffraction, focused ion beam scanning electron microscopy, micro-CT, and total organic carbon test. Additionally, the physical properties of different marl rock fabrics were studied with auxiliary tests, such as mercury intrusion capillary pressure analyses, nuclear magnetic resonance, porosity and permeability tests, and thin-section observation. The results revealed that the marl reservoir is characterized by low porosity (1.61%) and low permeability (2.56mD). The porosity and permeability (1.61% and 3.26mD) of laminated marl were better than those (0.92% and 1.68mD) of massive marl. Clay minerals and quartz content in laminated (11.8 and 8.2%) was less than in massive marl (16.2 and 13.3%). The marl pores include intercrystalline pores, dissolution pores, and microfractures. Additionally, the laminated marl pores were primarily distributed along the dark lamina, with good connectivity. A few isolated and uniform holes were observed in the massive marl. Influenced by rock fabric and mineral composition, layered fractures were mainly developed in the laminated marl, while structural fractures were the main type of microfractures in the massive marl. The primary sedimentary mechanism was the main geological action underlying the differences in marl rock fabric; this mechanism affects the physical properties of the marl reservoir, which are key factors to be considered when searching for the marl reservoir ‘sweet spots’. Particular attention should be paid to these factors during tight oil exploration and development in similar sedimentary basins.

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Quantitative Characterization of the Lower Limit of the Physical Properties of Tight Oil Reservoirs in Nano-Material Porous Media

Cited by 2 publications

References 25 publications

Microscale Reservoir Wettability Evaluation Based on Oil–Rock Nanomechanics

Microscale Reservoir Wettability Evaluation Based on Oil–Rock Nanomechanics

Reservoir characteristics and factors influencing shahejie marl in the shulu sag, bohai bay basin, eastern China

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