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CWP Seminars - 2015 Spring

CWP seminars discuss topics pertaining to our broad areas of research interests. These seminars are led by CWP faculty, students and, on occasion, by guest presenters. CWP seminars are held every Monday at 4 p.m. in the Green Center on the Colorado School of Mines campus. Click here to see previous CWP Seminars.

Note: To view weekly seminar schedules of individual CWP teams, click a link below:

A-Team seminars

C-Team seminars

iTeam seminars

Steam seminars

 

Spring 2015 CWP seminars

Date Speaker(s) Title Abstract
2/23

Vladimir Li

Vladimir Li

Anisotropy signature in RTM extended images for VTI media

I will discuss the defocusing in RTM extended images due to inaccuracy in an anisotropy model. I will show the influence of the anellipticity parameter eta, and the Thomsen coefficient delta. I will discuss the sensitivity of differential semblance optimization (DSO) and stack-power objective functions to eta and delta. Using a model with a single homogeneous layer, I will show DSO sensitivity kernels and gradients for the anellipticity parameter eta.

 

2/16 No seminar - Presidents' Day holiday
2/9

Yuting

Yuting Duan

Gradient computation and regularization for elastic waveform tomography

Elastic waveform tomography uses multicomponent waveform recordings and elastic wave equation modeling to reconstruct models of subsurface properties. Equations needed for elastic waveform tomography to reconstruct P- and S-wave velocity models are derived using the adjoint-state method. Synthetic tests demonstrate that, for a given acquisition geometry, P- and S-waves in general will update different areas of the subsurface. Moreover, certain areas might be updated by only one wave mode, and, as a result, the velocity model corresponding to the missing wave mode will not be well constrained. To better constrain the inversion, we introduce a regularization term that penalizes unrealistic relations between Vp and Vs.

Hui

Hui Wang

Anisotropic waveform tomography with pseudo-acoustic equations

Multi-parameter seismic waveform inversion especially with anisotropic parameters is intriguing but challenging due to the computational cost and the huge null-space introduced by the imperfect model parameterizations. I will briefly discuss the theory and the implementation of the gradients using the well-known adjoint-state method. Some computational cost issues associated with the modeling and adjoint modeling will be addressed. I will also illustrate the sensitivity kernels of different parameters using some synthetic models. If the time allows, I will introduce one possible set of inequality constraints to the inversion which can also be treated as the regularization term.

2/2 No seminar - CSM Department of Geophysics presentation
1/26

Roel Snieder

Roel Snieder

Walking in the footsteps of Michael Berry

I will give an overview of research that I did during my sabbatical. This includes super-resolution without evanescent waves, seismic waves as a Foucault pendulum (or not), interferometry in caustics, and time-lapse changes.

1/19

Elias Arias

Elias Arias

Internships with our sponsors and hackathon fun

BHP Billiton Petroleum Geoscience Internship
Hawkville, Red Hawk, and Black Hawk oil and gas fields comprise the Eagleford asset for BHP Billiton Petroleum. My summer internship was aimed at maximizing production for the Hawkville field given a newly processed seismic
dataset (pre-stack orthorhombic depth migration) and a large well log database.

ExxonMobil Exploration Company Geophysics Internship
I will give a quick general overview to my project and some key learnings.

SEG 2014 Geophysics Hackathon
As an undergraduate at CSM, a summer field session must be completed as part of the geophysics degree requirements. At this point, seismic acquisition and processing are vague concepts. Wouldn't it be nice to have a mobile app that helps you choose acquisition parameters so that the top and bottom of the layer being targeted is sure to be imaged? Well look no further, GeoRZA for Android can provide this service.

 

1/12 1st CWP seminar of the Spring 2015 semester (CWP administrative topics)

 

Previous CWP Seminars

2014

Fall

Spring

2013

Fall

Spring

2012

Fall

Spring

 

 

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