Browsing Earth Resources Laboratory by Title
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A Bayesian framework for fracture characterization from surface seismic data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)We describe a methodology for quantitatively characterizing the fractured nature of a hydrocarbon or geothermal reservoir from surface seismic data under a Bayesian inference framework. Fractures provide pathways for fluid ... 
Borehole Acoustics and Logging and Reservoir Delineation Consortia
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)Research activity in the Borehole Acoustics and Logging/Reservoir Delineation Consortia continue to focus on the development of geophysical methods to detect and characterize geological conditions which control fluid ... 
Borehole Effects On Downhole Seismic Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)An exact formulation for borehole coupling, which is valid for all frequencies and all azimuthally symmetric and nonsymrnetric components, is given in this paper. The borehole effects on downhole measurements are studied ... 
Borehole Electroseismic Measurements In Dolomite: Identifying Fractures And Permeable Zones
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)Measuring the electrical field induced by a borehole Stoneley wave is a new method for characterizing a rock formation around a borehole. Our field measurements demonstrate that the Stoneleywaveinduced electrical field ... 
Borehole Resistivity Inversion
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)In this paper we perform the inversion of borehole resistivity data using the software package developed by Western Atlas Logging Services, Houston, TX. Direct current resistivity methods, namely lateral sounding and ... 
Borehole Seismic Source Radiation In Layered Isotropic And Anisotropic Media: Boundary Element Modeling
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)An algorithm based on the boundary element method is established for modeling seismic source radiation from open or cased boreholes in layered transversely isotropic (TI) media. The axis of symmetry of TI layers is assumed ... 
Borehole Stoneley Wave Propagation Across Heterogeneous And Permeable Structures
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)This study investigates the propagation of borehole Stoneley waves across heterogeneous and permeable structures. By modeling the structure as a zone intersecting the borehole, a simple onedimensional theory is formulated ... 
Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures or fracture zone) is correlated with the permeability of the structure. Using a simplified Biot theory, the structure can be modelled ... 
Borehole Wave Propagation In Isotropic And Anisotropic Media I: Finite Difference Method
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)In this paper we developed a 3D finite difference method to simulate wave propagations in an isotropic medium. The wave equation is formulated into the firstorder hyperbolic equations by using velocity and stress and ... 
Borehole Wave Propagation In Isotropic And Anisotropic Media II: Isotropic Formation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)In this paper we apply the 3D finite difference method to simulate borehole wave propagations in an isotropic formation. The scheme is tested in a fluidfilled borehole surrounded by the homogeneous elastic formation. ... 
Borehole Wave Propagation In Isotropic And Anisotropic Media III: Anisotropic Formation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)In this paper we extend the 3D finite difference method to simulate wave propagations in an anisotropic medium. The scheme is tested in the homogeneous medium. The finite difference results agree excellently with the ... 
Calculation Of Conical (Mach) Wave Displacement Fields Radiated By Borehole Sources In Slow Formations And Inhomogeneous Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)Stationary phase solutions for the radiation patterns of borehole sources are commonly used to study the farfield seismic wavefields produced in crosshole or reverse VSP experiments, but they break down when the formation ... 
Carbon sequestration monitoring with acoustic doubledifference waveform inversion: A case study on SACROC walkaway VSP data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)Geological carbon sequestration involves largescale injection of carbon dioxide into underground geologic formations and is considered as a potential approach for mitigating global warming. Changes in reservoir properties ... 
Cased Borehole Effect On Downhole Seismic Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)Approximate and exact formulations are presented for the interaction of an incident wave with a cased borehole. In the approximate method, the borehole coupling theory is used to compute pressure in the fluid at a low ... 
Cement Bond Evaluation Using Early Refracted Arrivals
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)The cement bond evaluation tool is a device used to examine the integrity of cement bonding to the casing. A conceptual tool operating between 80200 kHz is considered here, with a transmitter and two receivers, oriented ... 
Characterization of Induced Seismicity in a Petroleum Reservoir: A Case Study
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)Fluid production and injection in hydrocarbon and geothermal reservoirs generally results in induced seismic activity. In this paper we study the microseismic activity in a petroleum field in Oman. The microearthquake data ... 
Characterization of Scattered Waves from Fractures by Estimating the Transfer Function Between Reflected Events Above and Below Each Interval
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)It is important to be able to detect and characterize naturally occurring fractures in reservoirs using surface seismic reflection data. 3D finite difference elastic modeling is used to create simulated surface seismic ... 
Characterizing Surface Roughness From PressureJoint Closure Measurements Using Inversion Procedure
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)An inversion procedure has been formulated to estimate the surface roughness of a joint (fracture) from the measured pressureclosure data. A gamma distribution for the local minima (or maxima) on a topography profile ... 
Characterizing the Mechanics of Fracturing from Earthquake Source Parameter and Multiplet Analyses: Application to the SoultzsousForêts Hot Dry Rock site
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)In 2000 and 2003, two massive hydraulic fracturing experiments were carried out at the European Geothermal Hot Dry Rock site at SoultzsousForêts, France. The objective was to create a dense network of enhanced ... 
Comparison of Discrete Fracture and Effective Media Representation of Fractures on Azimuthal AVO
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)In fractured reservoir development, azimuthal AVO (AVOaz) properties of reflected PP waves from reservoir tops are often used to infer fracture properties. The fracture parameter inversion is based on either an effective ...