Seismic Wave Propagation in Partially Saturated Rocks With a Fractal Distribution of Fluid‐Patch Size

Zhang, Lin; Ba, Jing; Carcione, José M.; Wu, Chunfang

doi:10.1029/2021jb023809

Cited by 34 publications

(10 citation statements)

References 89 publications

(152 reference statements)

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“…To account for the effect of such distribution, the idea of fractal distributions and the differential effective medium (DEM) approach can be applied to extend our model, as that done in Zhang et al. (2021, 2022).…”

Section: Discussionmentioning

confidence: 99%

Dynamic SV‐Wave Signatures of Fluid‐Saturated Porous Rocks Containing Intersecting Fractures

2022

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Detecting fracture intersections is crucial for understanding rock hydraulic properties. For this purpose, we study the dynamic SV‐wave signatures of fluid‐saturated porous rocks containing intersecting fractures. A theoretical model is derived using the dynamic Biot's poroelasticity equations. Using this model, we analyze the features of SV‐waves and compare to those of previously studied P‐waves. The results show that the dispersion and attenuation of SV‐waves caused by elastic scattering and FF‐WIFF (Fracture‐Fracture Wave‐induced Fluid Flow) have a similar dependence on properties of intersecting fractures and fluid as those of P‐waves. However, the FB‐WIFF (Fracture‐Background Wave‐induced Fluid Flow) causes much smaller dispersion and attenuation for SV‐waves than for P‐waves. In particular, such dispersion and attenuation of SV‐waves are negligibly small for the orthogonally intersecting fractures regardless of wave incidence angles. In addition to the dispersion and attenuation, the WIFF and elastic scattering also greatly affect the anisotropy properties, which gives rise to frequency‐dependent velocity and attenuation anisotropies for both SV‐ and P‐ waves. Such anisotropy properties are sensitive to fracture intersection angles and are quite different between SV‐ and P‐ waves. These complementary features of SV‐ and P‐ waves provide the basis for fracture intersection detection using the combined features of these two waves. By comparing our model to the known results for the limiting cases, we validate our model.

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Section: Discussionmentioning

confidence: 99%

Dynamic SV‐Wave Signatures of Fluid‐Saturated Porous Rocks Containing Intersecting Fractures

2022

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“…As stated above, the understanding on wave-loss mechanisms of hydrate-bearing sediments is still limited (Best et al, 2013). Figure 3 shows the mechanisms considered in our triple-porosity model, i.e., local fluid flow between the rock skeleton and hydrate and clay frames, and the classical Biot global flow (Zhang et al, 2022).…”

Section: The Modelmentioning

confidence: 99%

P-wave anelasticity in hydrate-bearing sediments based on a triple-porosity model

Guo²,

Carcione³

et al. 2023

Front. Earth Sci.

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P-wave anelasticity (attenuation and dispersion) of hydrate-bearing sediments depends on several factors, namely the properties of the mineral components, hydrate content and morphology, and fluid saturation. Anelasticity is analyzed with a triple-porosity model (stiff pores, clay micropores and hydrate micropores), by considering hydrate as an additional solid skeleton. We relate the hydrate volume ratio, porosity and radii of the hydrate inclusion and clay mineral to the P-wave velocity and attenuation. The model takes wave-induced local fluid flow (mesoscopic loss) at the grain contacts into account. The results are compared with those of a double-porosity and load-bearing models, and verified with well-log data from Offshore Drilling Program sites 1247B and 1250F, and data reported in Nankai Trough, Japan. Model results and data show a good agreement.

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“…A lot of rock physics models are available for simulating oil sands elastic properties (Guo and Han, 2016;Yuan et al, 2020;Qi et al, 2021;Zhang et al, 2021;Zhang et al, 2022). However, only three models (Hertz-Mindlin model, Voigt-Reuss-Hill average, and iso-frame model) are used here, mainly due to two reasons.…”

Section: Figure 14mentioning

confidence: 99%

Evaluation of the consolidation status of heavy oil sands through rock physics analysis: A case study from Fengcheng oilfield

Yuan

Han²,

Zhang³

et al. 2023

Front. Earth Sci.

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Heavy oil is an important unconventional oil resource with huge availability worldwide, which also forms the primary oil source in Fengcheng oilfield, XinJiang, China. The elastic properties and consolidation status of heavy oil sands are of significant values as they can provide guidance for reservoir exploration and production. However, due to the lack of detailed rock physics investigation of the heavy oil sands in Fengcheng oilfield, the knowledge about their micro-scale elastic properties and consolidation status is still limited. Based on the well log data and laboratory measurements, we performed rock physics analysis of the heavy oil sands’ elastic properties. We first analyzed the well logs to determine the oil sands formations and then quantitatively delineated the relations between density, porosity, and velocity. Combining with laboratory measured data, we applied theoretical rock physics models to characterize the consolidation status of the heavy oil sands. Our results show that the oil sands in this area are poorly consolidated with a loose rock frame. Overall, this study highlights the micro-scale elastic properties of the heavy oil sands in Fengcheng oilfield and also reveals the consolidation status. It presents a method of integrating well log, laboratory data, and rock physics analysis to evaluate the consolidation status of heavy oil sands, which can facilitate the future detailed petrophysical analysis and provide important information for seismic characterization and drilling risk evaluation.

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Seismic Wave Propagation in Partially Saturated Rocks With a Fractal Distribution of Fluid‐Patch Size

Cited by 34 publications

References 89 publications

Dynamic SV‐Wave Signatures of Fluid‐Saturated Porous Rocks Containing Intersecting Fractures

Dynamic SV‐Wave Signatures of Fluid‐Saturated Porous Rocks Containing Intersecting Fractures

P-wave anelasticity in hydrate-bearing sediments based on a triple-porosity model

Evaluation of the consolidation status of heavy oil sands through rock physics analysis: A case study from Fengcheng oilfield

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