Browsing ERL Industry Consortia Technical Reports by Title
Now showing items 272-291 of 456
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Modeling Borehole Stoneley Wave Propagation Across Permeable In-Situ Fractures
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)The characterization of hydraulic transmissivity of permeable fracture reservoirs is a very important task in the exploration of water resources and hydrocarbons. Previous studies that model the permeable structure as a ... -
Modeling Fluid Flow In Heterogeneous And Anisotropic Porous Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)Permeability distribution in reservoirs is very important for the flow of water or oil and gas. In this study, the effects of various heterogeneous permeability distributions on the flow field are simulated using the finite ... -
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 ... -
Modeling Of Elastic Wave Propagation In A Fluid-Filled Borehole Excited By A Piezoelectric Transducer
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)Acoustic logging is an important geophysical method for obtaining relevant information concerning rock properties in formations traversed by boreholes. Typically, the formation parameters that are measured are the ... -
Modeling Of Elastic Wave Propagation On Irregular Triangular Grids Using A Finite-Volume Method
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)We present a finite-volume method for the modeling of wave propagation on irregular triangular grids. This method is based on an integral formulation of the wave equation via Gauss's theorem and on spatial discretization ... -
Modeling Of Seismoelectric Effects In A Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)We present a method to simulate the propagation of seismic and converted electromagnetic waves generated by a mechanical borehole source embedded in a layered poroelastic medium. The electroseismic conversions occur at ... -
Modeling The Drag Forces Of Porous Media Acoustics
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)The drag forces controlling the amount of relative flow induced in a fluid-saturated porous material by a mechanical wave are modeled here from first principles. Specifically, analytical expressions are derived for the ... -
Modelling Of Downhole Seismic Sources I: Literature Review, Review Of Fundamentals, Impulsive Point Source In A Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)This paper represents the first of a two paper sequence comprising a multi-faceted introduction to the numerical and analytical modelling of seismic sources in a borehole. Part one will present a literature review and a ... -
Modelling Of Downhole Seismic Sources II: An Analysis Of The Heelan/Brekhovskikh Results And Comparison Of Point Source Radiation To Radiation From Boreholes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)The work of Heelan (1952, 1953a,b) was one of the first studies of wave propagation from a cylindrical boundary. Heelan attempted to model the radiation emanating from a cylindrical shot hole filled with dynamite. To do ... -
Modelling Of Full Waveform Acoustic Logs In Soft Marine Sediments
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)Full waveform acoustic logs obtained from the Deep Sea Drilling Project (DSDP) were modelled using synthetic full waveform acoustic logs. These synthetic logs were calculated using the discrete wavenumber method. The model ... -
Models In LWD Applications
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)A model for a fluid-filled borehole with an LWD tool is used to identify and analyze the monopole, dipole, and quadrupole modes that are present. The modes can be classified into three groups and have dispersion behavior ... -
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 ... -
Multi-And Monoscale Attributes For Well And Seismic Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)Edges in a medium are the primary source of coherent reflections because they exhibit a large or even diverging amplitude behavior for their derivatives. Generally the medium properties are not only assumed to jump across ... -
A multi-pass one way method to include turning waves and multiples
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)Conventional one way migration methods exclude turning waves and multiples. We propose an algorithm that uses multiple passes to extend the one way method to efficiently include these wavepaths. A comparison of the images ... -
Multi-Shot Processing For Better Velocity Determination
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)We develop a linear programming inversion scheme to estimate lithology from well log data. The inversion described severely limits the dependence on core retrieval, and makes accurate mapping of new parameters possible. ... -
Multi-Shot Processing For Better Velocity Determination
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)We perform a technique called multi-shot processing on a section of 12-channel sonic logs in order to better resolve compressional and shear velocities. The data are from the ODP Leg 102 cruise, which occupied drill site ... -
Multifractional splines: from seismic singularities to geological transitions
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)A matching pursuit technique in conjunction with an imaging method is used to obtain quantitative information on geological records from seismic data. The technique is based on a greedy, non-linear search algorithm ... -
Multiple aperture INSAR (MAI) with C-band and L-band data: Noise and precision
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)MAI is a technique to extract along-track (horizontal) phase-based displacements from InSAR data. MAI’s theoretical precision can be at the centimeter level, an order of magnitude improvement over amplitude-based pixel ... -
Multiple Multipole Expansions For Elastic Scattering: An Aid To Understanding The Problems In "No-Record" Areas
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)This paper presents a new approach to solving scattering of elastic waves in two dimensions. Wavefields are often expanded into an orthogonal set of basis functions. Unfortunately, these expansions converge rather slowly ... -
Multipole seismoelectric logging while drilling (LWD) for acoustic velocity measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)In seismoelectric well logging, an acoustic wave propagates along a borehole and induces electrical signals along the borehole wall. The apparent velocities of these seismoelectric signals are equal to the formation ...
