Seismic response of fractures by numerical simulation

Hall, Fiona; Wang, Yanghua

doi:10.1111/j.1365-246x.2012.05360.x

Cited by 16 publications

(11 citation statements)

References 36 publications

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“…So compared to Vlastos et al (2007), Wang (2012), the crack density is replaced with porosity within the fracture, and two constants representing a compact cluster of dry cracks are replaced with N C and T C , to represent fluid filled fractures.…”

Section: Seismic Response Of Fracturesmentioning

confidence: 99%

“…Therefore, a rotation matrix should be applied to model fractures with different orientations. As pointed out by Hall and Wang (2012), the Love notation of the elastic constant as second order ij c , although a convenient form, is not a true second order tensor and cannot be rotated as such in the finite difference grid. It is necessary to return to the original full, fourth order tensor …”

Section: Seismic Response Of Fracturesmentioning

confidence: 99%

“…Frequency-dependent seismic response of fractures is simulated by wave equation modelling in the equivalent anisotropic media, in which fractures are incorporated into finite-differencing grids using an effective medium theory (Coates and Schoenberg 1995;Liu et al 2000;Hudson et al 2001). This theory can deal with fracture scattering without having any limitation on the number of fractures within the media We attempt to investigate fractures that have characters of continuous, parallel-walled layers, filled with weak solid (Liu et al 2000;Hall and Wang 2012). These fractures can be a good representation of common hydraulic fractures, to allow fluids (water, oil or gas) to flow more readily to the wellbore (Liu and Martinez 2013).…”

Section: Introductionmentioning

confidence: 99%

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Seismic attenuation in fractured media

Rao

Wang

2014

J. Geophys. Eng.

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The prime objective of this paper is to quantitatively estimate seismic attenuation caused by fractures with different physical parameters. In seismic wave simulation, the fractured media are treated as the anisotropic media equivalently, and fractures are represented by frequency-dependent elastic constants. Based on numerical experiments with three different parameters: viscosity, porosity and the Lamé parameters, this paper has the following observations. First, seismic attenuation is not affected by the viscosity within fractures while it increases with the increase of porosity and decreases with the increase of the Lamé parameters within fractures. Among the latter two parameters, seismic attenuation is more sensitive to the Lamé parameters than to the porosity. Second, for the attenuation anisotropy, low frequencies have more anisotropic effect than high frequencies. For example, 50 Hz wavefield has the strongest anisotropy effect, if compared to 100 and 150 Hz wavefields. The attenuation anisotropy for low frequency (say 50 Hz) is more sensitive to the viscosity than the porosity, and the Lamé parameters has the weakest effect among these three parameters. These observations suggest that low-frequency seismic attenuation and especially the attenuation anisotropy in low frequency would have great potential for fluid discrimination within fractured media.

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Section: Seismic Response Of Fracturesmentioning

confidence: 99%

Section: Seismic Response Of Fracturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic attenuation in fractured media

Rao

Wang

2014

J. Geophys. Eng.

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“…For this reason, many studies have emphasized the analysis of the influence of fluids on seismic wave propagation in such materials as a function of fracture-filling fluids (Hudson 1981;Sayers 2002a;Chapman 2003;Chapman et al 2003;Maultzsch et al 2003;Guéguen & Sarout 2009;Hall & Wang 2012). In general, fluids with a low bulk modulus, such as gas, will reduce the elastic moduli compared to the stiffer fluids such as brine, and open fractures will be more easily detected in such cases.…”

mentioning

confidence: 98%

An effective medium model for the stress-dependence of anisotropic seismic velocities in fractured rock

Gibson

Gao

2014

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Reliable analysis of time-lapse seismic data to detect movements of pore fluids requires consideration of variations in subsurface stress as well as fluid saturations. Achieving this goal requires reliable rock physics models that relate these stress changes to seismic velocity. Although there are many theories for the effective elastic properties of fractured media, only a small number directly include stress-dependence. Therefore, we have developed a new model that provides expressions that are comparatively easy to work with and requires estimation of only a small number of parameters. In this paper, we apply this model for the first time to the inversion of published laboratory measurements of pressure-dependent anisotropic seismic velocities. Specifically, we utilize measured velocities in two orthogonal directions to estimate the model parameters for a transversely isotropic medium. The model is then used to predict directional velocity variation in other directions at ambient pressure, and the errors in all cases are small. Synthetic shear wave seismograms computed for a hypothetical carbonate reservoir model show the changes in shear wave splitting and travel times that are predicted when seismic properties are computed using the theoretical model and help to illustrate the potential applications of the theoretical model to reservoir characterization.

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“…Tillotson et al (2012) reported experiments on synthetic rock samples to support theoretical predictions that shear-wave splitting can be used as a good estimate of fracture density. Further research has highlighted the frequency-and scale-dependent nature of fracture compliance (Hobday & Worthington 2012), the use of scattered seismic energy to constrain fracture spacing and intensities (Vlastos et al 2007), and advanced numerical methods to simulate seismic-wave propagation in discrete representations of fracture populations (Hall & Wang 2012). Although by no means mature, improved approaches to predict anisotropic permeability have been explored through the analysis of frequencydependent seismic amplitude v. angle and azimuth data (Ali & Jakobsen 2013).…”

Section: Selected Advancesmentioning

confidence: 99%

Fundamental controls on fluid flow in carbonates: current workflows to emerging technologies

Agar

Geiger

2014

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The introduction reviews topics relevant to the fundamental controls on fluid flow in carbonate reservoirs and to the prediction of reservoir performance. The review provides research and industry contexts for papers in this volume only. A discussion of global context and frameworks emphasizes the value yet to be captured from compare and contrast studies. Multidisciplinary efforts highlight the importance of greater integration of sedimentology, diagenesis and structural geology. Developments in analytical and experimental methods, stimulated by advances in the materials sciences, support new insights into fundamental (pore-scale) processes in carbonate rocks. Subsurface imaging methods relevant to the delineation of heterogeneities in carbonates highlight techniques that serve to decrease the gap between seismically resolvable features and well-scale measurements. Methods to fuse geological information across scales are advancing through multiscale integration and proxies. A surge in computational power over the last two decades has been accompanied by developments in computational methods and algorithms. Developments related to visualization and data interaction support stronger geoscience-engineering collaborations. High-resolution and real-time monitoring of the subsurface are driving novel sensing capabilities and growing interest in data mining and analytics. Together, these offer an exciting opportunity to learn more about the fundamental fluid-flow processes in carbonate reservoirs at the interwell scale.

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Seismic response of fractures by numerical simulation

Abstract: 12.02.15 KB. Ok to add published version to spiral, publisher policy

Cited by 16 publications

References 36 publications

Seismic attenuation in fractured media

Seismic attenuation in fractured media

An effective medium model for the stress-dependence of anisotropic seismic velocities in fractured rock

Fundamental controls on fluid flow in carbonates: current workflows to emerging technologies

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