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Now showing items 11-20 of 35
Monitoring Seismic Attenuation Changes Using a 4D Relative Spectrum Method in Athabsca Heavy Oil Reservoir, Canada
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
Heating heavy oil reservoirs is a common method for reducing the high viscosity of heavy oil and thus increasing the recovery factor. Monitoring these changes in the reservoir is essential for delineating the heated region ...
Estimating the fracture density of small-scale vertical fractures when large-scale vertical fractures are present
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
When fractures are vertical, aligned and their dimensions are small relative to the seismic wavelength, the medium can be considered to be an equivalent Horizontal Transverse Isotropic (HTI) medium. However, geophysical ...
A robust method for fracture orientation and density detection from seismic scattered energy
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
The measurements of fracture parameters, such as fracture orientation, fracture density and fracture compliance, in a reservoir is very important for field development and exploration. Traditional seismic methods for ...
Modeling of acoustic wave scattering from a two-dimensional fracture
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
In this paper, we model the acoustic scattering from a two dimensional fracture that is simulated by two different physical models. We calculate the scattering from the fractures with different properties based on these ...
Finite Difference Elastic Wave Modeling Including Surface Topography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
Surface topography and the weathered zone (i.e., heterogeneity near the earth’s surface) have great effects on elastic wave propagation. Both surface waves and body waves are contaminated by scattering and conversion by ...
SH Wave Scattering from Fractures using Boundary Element Method with Linear Slip Boundary Condition
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
A boundary element method (BEM) combined with a linear slip boundary condition is proposed to calculate SH wave scattering from fractures. The linear slip boundary condition was proposed by Schoenberg (1980) to model elastic ...
Carbon sequestration monitoring with acoustic double-difference waveform inversion: A case study on SACROC walkaway VSP data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
Geological carbon sequestration involves large-scale injection of carbon dioxide into underground geologic formations and is considered as a potential approach for mitigating global warming. Changes in reservoir properties ...
Advanced 3D Geophysical Imaging Technologies for Geothermal Resource Characterization
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
We describe the ongoing development of joint geophysical imaging methodologies for geothermal site characterization and demonstrate their potential in two regions: Krafla volcano and associated geothermal fields in ...
Sensitivity of time lapse seismic data to the compliance of hydraulic fractures
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
We study the sensitivity of seismic waves to changes in the fracture normal and tangential compliances by analyzing the fracture sensitivity wave equation, which is derived by differentiating the elastic wave equation with ...
Simultaneous Estimation of Reflectivity and Geologic Texture: Least-Squares Migration with a Hierarchical Bayesian Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
In many geophysical inverse problems, smoothness assumptions on the underlying geology are utilized to mitigate the effects of poor resolution and noise in the data and to improve the quality of the inferred model parameters. ...