Search
Now showing items 1-10 of 18
An improved method for hydrofracture induced microseismic event detection and phase picking
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
The ability to detect small microearthquakes and identify their P and S phase arrivals is a
key issue in hydrofracture downhole monitoring because of the low signal-to-noise ratios.
We apply an array-based waveform ...
Focal Mechanism Determination Using High Frequency Waveform Matching and Its Application to Small Magnitude Induced Earthquakes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
We present a new method using high frequency full waveform information to determine the
focal mechanisms of small, local earthquakes monitored by a sparse surface network. During the
waveform inversion, we maximize both ...
Kinematic redatuming by two source interferometry
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-04-26)
Interferometry is a method of redatuming physical sources to receiver locations. Under idealized assumptions stacking the cross correlogram of the two common receiver gathers yields a bandlimited
Green's function between ...
Detecting medium changes from coda by interferometry
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
In many applications, sequestering CO[subscript 2] underground for example,
determining whether or not the medium has changed is
of primary importance, with secondary goals of locating and
quantifying that change. We ...
Imaging the Soultz Enhanced Geothermal Reservoir Using Double-Difference Tomography and Microseismic Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-06)
We applied the double-difference tomography method to image the P and S-wave
velocity structure of the European Hot Dry Rock geothermal reservoir (also known
as the Soultz Enhanced Geothermal System) at Soultz-sous-Forets, ...
Downhole microseismic monitoring of hydraulic fracturing: a full-waveform approach for complete moment tensor inversion and stress estimation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
Downhole microseismics has gained in popularity in recent years as a way to characterize hydraulic fracturing sources and to estimate in-situ stress state. Conventional approaches only utilize part of the information ...
Using SVD for improved interferometric Green’s function recovery.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
Seismic interferometry is a technique used to estimate the
Green’s function (GF) between two receiver locations, as if
there were a source at one of the locations. By crosscorrelating
the recorded seismic signals at the ...
Asymmetric source acoustic LWD for the improved formation shear velocity estimation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
Most acoustic logging while drilling (LWD) tools generate
a single pure borehole mode (e.g., dipole or quadrupole) to
estimate the formation shear velocity. We propose an approach
where multipole modes are generated ...
Array-conditioned deconvolution of multiple component teleseismic recordings
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-01-01)
We investigate the applicability of an array-conditioned deconvolution technique, developed for analyzing borehole seismic exploration data, to teleseismic receiver functions and data preprocessing steps for scattered ...
Sensitivity analysis of fracture scattering
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
The understanding of seismic scattering of a finite fracture
is very important in reservoir fracture characterizations, but
the analytical solution of this problem is not available. Thus,
in this paper, we present an ...