Browsing ERL Industry Consortia Technical Reports by Title
Now showing items 277-296 of 456
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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 ... -
Multiscale Determination of In Situ Stress and Fracture Properties in Reservoirs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-02)In this thesis we address the problem of determining in situ stress and fracture properties in reservoirs using borehole logs and surface seismic reflection data. The dissertation covers four subtopics. The first is the ... -
Near-Surface Scattering From High Velocity Carbonates In West Texas
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)Seismic data acquired directly over near-surface limestone formations are commonly observed to be of inferior quality. A possible cause for this degradation is scattering in the near-subsurface by, e.g., the weathering ... -
New Applications In The Inversion Of Acoustic Full Waveform Logs - Relating Mode Excitation To Lithology
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986-01-01)Existing techniques for the quantitative interpretation of waveform data have been based on one of two fundamental approaches: 1) simultaneous identification of compressional and shear wave velocities; and 2) least-squares ... -
Non-Linear Constraints with Application to Self-Potential Source Inversion
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2006-05)We investigate the use of non-linear constraints for geophysical inverse problems, with specific examples applied to source inversion of self-potential data. Typical regularization methods often produce smooth solutions ... -
Nonhyperbolic Reflection Moveout For Azimuthally Anisotropic Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)Reflection moveout in azimuthally anisotropic media is not only azimuthally dependent but it is also nonhyperbolic. As a result, the conventional hyperbolic normal moveout (NMO) equation parameterized by the exact NMO ...
