Browsing ERL Industry Consortia Technical Reports by Title
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P And S Wave Velocity Determination
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)There are three general methods that can be used to determine formation velocities from full waveform logs. The first approach is to make use of the data from the entire waveform. This type of velocity analysis is performed ... 
P and SV waves 3D Numerical Modeling of AVOA from Heterogeneous Fractured Reservoirs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)We study the effects of fractureinduced anisotropy and lateral fracture density heterogeneity on the reflected P and SV wave amplitude variation with offset and azimuth (AVOA), using 3D finitedifference simulations. The ... 
Passive Seismic Tomography Using Induced Seismicity at a Petroleum Field in Oman
(Massachusetts Institute of Technology. Earth Resources Laboratory, 20090519)A borehole network consisting of 5 monitoring wells was used to monitor the induced seismicity at a producing petroleum field for a period of about 11 months. Nearly 5400 microseismic events were analyzed and utilized ... 
Permeability Estimation from Field Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)Strong correlations exist between core measured permeability values and the phase velocity and attenuation of the tube wave obtained from full waveform acoustic logs. A number of authors have applied the Biot theory to ... 
Permeability Estimation From Velocity Anisotropy In Fractured Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal and the direction of the applied stress. If the prestress fracture distribution is ... 
Permeability Estimation From Velocity Anisotropy In Fractured Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal vectors and the direction of the applied stress. If the prestress fracture orientation ... 
Petroleum Source Rock Logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)Regional distributions of organic content are an important aid in developing basin evolution and hydrocarbon generation models. An approach to evaluate hydrocarbon source rocks using resistivity, sonic, density, neutron ... 
Physical Properties of a Set of Sandstones, III: the Effects Of Fine Grained Pore Filling Material on Compressional Wave Velocity
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)We have used aspect ratio modeling to explain the measured compressional wave velocities of twenty different dry sandstone samples with varying clay contents at a single confining pressure of 0.5 kbar. Velocities of the ... 
Polarization Of Flexural Waves In An Anisotropic Borehole Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)Two modes of flexural waves can be generated by a dipole source in an anisotropic borehole. Their velocities are related to those of the fast and slow shear waves in the formation. The particle motions and the polarization ... 
Pore Geometry And Permeability Modeling From Pressure Dependence Of Transport Properties In Sandstone
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)In this paper, a model of the pore geometry of sandstones is proposed. Three categories of pores are considered: large spherical pores at 4grain vertices, tubelike throats at 3grain edges and narrow sheetlike throats ... 
Pore Scale Modeling of Rock Properties and Comparison to Laboratory Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)The microstructure of a porous medium and the physical characteristics of the solid and fluid phases determine the macroscopic transport properties of the medium. The purpose of this paper is to test numerical calculations ... 
PoreScale Simulation Of Experimentally Realizable, Oscillatory Flow In Porous Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)We report new simulations of oscillating flow in porous rock. Our goal is to better understand the frequency dependence of porescale fluid motion, which should ultimately help us to interpret attenuation and electroseismic ... 
Predicting stressinduced anisotropy around a borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)Formation elastic properties near a borehole may be altered from their original state due to the stress concentration around the borehole. This could result in a biased estimation of formation properties but could provide ... 
The propagation and linkage of normal faults: Insights from the StrathspeyBrentStatfjord fault array, northern North Sea
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)Through examination of the scaling relations of faults and the use of seismic stratigraphic techniques, we demonstrate how the temporal and spatial evolution of the fault population in a halfgraben basin can be accurately ... 
Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)Flexural waves generated by a dipole source have been studied theoretically and used to estimate the shear parameters of a formation. The basic principles and main properties of flexural waves propagating in a borehole ... 
Quantitative tools for seismic stratigraphy and lithology characterization
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)Seismological images represent maps of the earth's structure. Apparent bandwidth limitation of seismic data prevents successful estimation of transition sharpness by the multiscale wavelet transform. We discuss the application ... 
Radiation Patterns Of Compressional And Shear Transducers At The Surface Of An Elastic Half Space
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)The radiation patterns of an elastic wave field generated by circular plane compressional and shear transducers are derived using the method of steepest descent. These patterns contain both effects of the elastic half ... 
Rapid 3D Raytracing For Optimal Seismic Survey Design
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)A useful approach to optimal seismic survey design is to simulate the seismic response for a suite of a priori subsurface models and shotreceiver templates. The response can be used to evaluate many criteria such as ... 
Realtime ensemble control with reducedorder modeling
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)The control of spatially distributed systems is often complicated by significant uncertainty about system inputs, both timevarying exogenous inputs and timeinvariant parameters. Spatial variations of uncertain parameters ... 
Recursive Imaging with MultiplyScattered Waves Using Partial Image Regularization: A North Sea Case Study
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)As more resources are directed toward reversetime migration an accurate velocity model, including strong reflectors, is necessary to form a clear image of the subsurface. This is of particular importance in the vicinity ...