Fluid discrimination incorporating amplitude variation with angle inversion and squirt flow of the fluid

Wang, Yurong; Zong, Zhaoyun; Yin, Xingyao

doi:10.1016/j.petsci.2022.03.007

Petroleum Science

2022

DOI: 10.1016/j.petsci.2022.03.007

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Fluid discrimination incorporating amplitude variation with angle inversion and squirt flow of the fluid

Yurong Wang

Zhaoyun Zong

Xingyao Yin

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Cited by 12 publications

(1 citation statement)

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“…Developing a poroelasticity model that accounts for multiscale heterogeneities and establishing a link between geophysical responses at different frequencies is critical. Such understanding may be insightful for oil and gas exploration and development, seismic monitoring of CO 2 storage, and gas storage site selection (Sokama-Neuyam et al, 2020;Wang et al, 2022;Zhong et al, 2023). Ultrasonic experiments are conducted at higher frequencies (∼MHz) than borehole (∼kHz) and seismic surveys (∼several tens of Hz).…”

mentioning

confidence: 99%

Effects of Pore Geometry and Saturation on the Behavior of Multiscale Waves in Tight Sandstone Layers

Ba,

Ma,

Carcione

et al. 2023

JGR Solid Earth

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Geometric heterogeneities in tight reservoir rocks saturated with a fluid mixture may exhibit different scale distribution characteristics. Conventional models of rock physics based on poroelasticity, which usually consider single‐scale pore structure and fluid patches, are inadequate for describing elastic wave responses. A major challenge is to establish the relationship between the wave response at different spatial scales and frequencies. To address this problem, three sets of observational data over a wide frequency range were obtained from a tight oil reservoir in the Ordos Basin, China. Ultrasonic measurements were made on eight sandstone samples at partial oil‐water saturation at 0.55 MHz. Data from six borehole measurements and seismic profiles were acquired and analyzed at about 10 kHz and 30 Hz, respectively. Analysis of the cast thin sections shows that dissolution pores and microcracks generally develop, with fractal dimensions of the pores ranging from 2.45 to 2.67 for the samples with porosities between 5.1% and 10.2%. Compressional wave velocity and attenuation were estimated from the observed data. The results show that the velocity dispersion from seismic to ultrasonic frequencies is 10.02%, mostly occurring between sonic and ultrasonic frequencies. The attenuation is stronger at higher oil saturation. The relationships between velocity, attenuation, and wavelength were established and can be used for further forward modeling and seismic interpretation studies. A partial saturation model has been derived based on effective differential medium theory and a double double‐porosity model, assuming that the medium contains fractal cracks and fluid patches. The effects of scale and saturation on wave responses are prevalent. Modeling results consistent with observed data show that the radii of cracks and fluid patches range from 0.1 μm to 2.8 mm, affecting ultrasonic, acoustic, and seismic attenuation. The multiscale data and proposed model quantify the relationship between fracture and fluid distributions and attenuation and could be useful for upscaling to the reservoir scale. The study helps improve the understanding of seismic wave propagation in partially saturated rocks, which has potential applications in seismic exploration, hydrocarbon production in reservoirs, and CO2 sequestration in aquifers.

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mentioning

confidence: 99%

Effects of Pore Geometry and Saturation on the Behavior of Multiscale Waves in Tight Sandstone Layers

Ba,

Ma,

Carcione

et al. 2023

JGR Solid Earth

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Rock physics-based analysis to discriminate lithology and pore fluid saturation of carbonate reservoirs: a case study

Makarian

Elyasi²,

Moghadam

et al. 2023

Acta Geophys.

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An efficient and comprehensive poroelastic analysis of hydrocarbon systems using multiple data sets through laboratory tests and geophysical logs: a case study in an iranian hydrocarbon reservoir

Makarian

Abad

Manaman

et al. 2023

Carbonates Evaporites

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Fluid discrimination incorporating amplitude variation with angle inversion and squirt flow of the fluid

Cited by 12 publications

References 50 publications

Effects of Pore Geometry and Saturation on the Behavior of Multiscale Waves in Tight Sandstone Layers

Effects of Pore Geometry and Saturation on the Behavior of Multiscale Waves in Tight Sandstone Layers

Rock physics-based analysis to discriminate lithology and pore fluid saturation of carbonate reservoirs: a case study

An efficient and comprehensive poroelastic analysis of hydrocarbon systems using multiple data sets through laboratory tests and geophysical logs: a case study in an iranian hydrocarbon reservoir

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