Browsing Earth Resources Laboratory by Title
Now showing items 357-376 of 456
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S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)From polarization analysis on a covariance matrix, a method of S-wave splitting analysis is developed, which processes 3-component recordings simultaneously, rather than just 2 horizontal components as done traditionally. ... -
Sandstone Pore Aspect Ratio Spectra from Direct Observations and Velocity Inversion
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)Measurements of pore shapes from Scanning Electron Microscope (SEM) images for three sandstone samples (the Navajo Sandstone, the Weber Sandstone, and the Kayenta Sandstone) are compared to the aspect ratio spectra ... -
Scale And Frequency Dependence Of Reflection And Transmission Coefficients
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)Well-logs show that heterogeneities occur at many different spatial scales. In this paper, we want to characterize how waves are affected by these heterogeneities, and we study how reflection and transmission coefficients ... -
Scaling And Seismic Reflectivity: Implications Of Scaling On Avo
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)AVO analysis of seismic data is based on the assumption that transitions in the earth consist of jump discontinuities only. The generalization of this type of transition to a more realistic class of transitions shows a ... -
Scattering Characteristics In Heterogeneous Fractured Reservoirs From Waveform Estimation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)Offset-dependent characteristics of seismic scattering are useful in the interpretation of fractured reservoirs. Synthetic seismograms generated by a 3-D finite difference modeling are used to study elastic wave propagation ... -
Scattering Of Acoustic And Elastic Waves Using A Hybrid Multiple Multipole Expansions-Finite Element Technique
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)In this paper, two different methods to solve scattering problems in acoustic or elastic media are coupled to enhance their usefulness. The multiple multipole (MMP) expansions are used to solve for the scattered fields ... -
Scholte waves generated by seafloor topography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)Seafloor topography can excite strong interface waves called Scholte waves that are often dispersive and characterized by slow propagation but large amplitude. This type of wave can be used to invert for near seafloor shear ... -
Secondary Shear Waves From Source Boreholes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)The purpose of this paper is to synthesize the most important results of the thesis work of Meredith (1990) concerning radiation from seismic sources in boreholes. Previous studies of radiation from sources in boreholes ... -
Seismic characterization of fractured reservoirs using 3D double beams
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)We propose an efficient target-oriented method to characterize seismic properties of fractured reservoirs: the spacing between fractures and the fracture orientation. We use both singly scattered and multiply scattered ... -
Seismic characterization of reservoirs with variable fracture spacing by double focusing Gaussian beams
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Fractured reservoirs account for a majority of the oil production worldwide and often have low recovery rate. Fracture characterization is important in building reservoir flow models for enhanced oil recovery. Information ... -
Seismic Delineation Of A Geothermal Reservoir
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)Surface seismic reflection surveys and VSP's have been extensively carried out in the Monteverdi area, within the Larderello region. Calibration of these seismic observations with data from numerous deep wells allowed ... -
Seismic Facies Characterization By Scale Analysis
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)Over the years, there has been an ongoing struggle to relate well-log and seismic data due to the inherent bandwidth limitation of seismic data, the problem of seismic amplitudes, and the apparent inability to delineate ... -
Seismic Facies Classification And Identification By Competitive Neural Networks
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)We present an approach based on competitive networks for the classification and identification of reservoir facies from seismic data. This approach can be adapted to perform either classification of the seismic facies based ... -
Seismic Imaging and Illumination with Internal Multiples
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)If singly scattered seismic waves illuminate the entirety of a subsurface structure of interest, standard methods can be applied to image it. It is generally the case, however, that with a combination of restricted ... -
Seismic imaging of hydraullically-stimulated fractures: A numerical study of the effect of the source mechanism
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)We present a numerical study of seismic imaging of hydraulically stimulated fractures using a single source from an adjacent fracturing-process. The source is either a point force generated from the perforation of the ... -
Seismic Imaging Of The Velocity Structure And The Location Of A Hydrofrac In A Geothermal Reservoir
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)The Los Alamos Hot Dry Rock Reservoir is an experimental geothermal project in north-central New Mexico. A fractured zone was created within otherwise impermeable igneous and metamorphic rock by injecting water into a ... -
Seismic Scattering Attributes to Estimate Reservoir Fracture Density: A Numerical Modeling Study
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003-09)We use a 3-D finite difference numerical model to generate synthetic seismograms from a simple fractured reservoir containing evenly-spaced, discrete, vertical fracture zones. The fracture zones are represented using a ... -
Seismic Waves in a Borehole - A Review
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)The propagation of seismic waves in an open borehole is reviewed. The principal wave types are the refracted P and S waves and the two guided waves - pseudo-Rayleigh and Stoneley. The dispersion properties of the guided ... -
Seismoelectric And Seismomagnetic Measurements In Fractured Borehole Models
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)Seismoelectric and seismomagnetic fields generated by acoustic waves in fluid-saturated fractured borehole models are experimentally investigated with an electrode and a Halleffect sensor. In a borehole with a horizontal ... -
Seismoelectric Laboratory Measurements In A Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)The seismoelectric logging method is based on measuring the electric field generated by seismic waves in a fluid-filled borehole. Two kinds of electromagnetic (EM) fields can be generated within the formation and at the ...
