Category Archives: News and Events

Latest CRGC-related News and Events.

Seminar: New developments in anisotropic processing of seismic data: An overview

Dr. Ilya Tsvankin, Professor, Department of Geophysics  Centre for Wave Phenomena, Colorado School of Mines

Title: New developments in anisotropic processing of seismic data: An overview

Wednesday 28 February 2018, 3PM–4PM

ABSTRACT:

I will give a brief overview of the research program of my research group, the A(nisotropy)-Team at the Centre for Wave Phenomena (CWP). The group’s portfolio includes a wide range of projects on modelling, inversion, and imaging of seismic reflection and borehole data from anisotropic media.

The team also works on seismic fracture characterisation and collaborates with the Reservoir Characterisation Project at the School of Mines on time-lapse monitoring of unconventional reservoirs. Among the topics discussed in the talk are:

  •  ray-based and wave-equation migration velocity analysis for anisotropic media
  • elastic full-waveform inversion (FWI) of reflection and microseismic data
  • estimation of attenuation anisotropy from multicomponent wavefields
  • application of anisotropic models in time-lapse seismic

Seminar: Evolution of Effluent Chemist at Crystal Geyser, Green River, Utah

Dr. Weon Shik Han, Associate Professor, Department of Earth System Sciences Yonsei University, Seoul, Republic of Korea

Title: Evolution of Effluent Chemist at Crystal Geyser, Green River, Utah

Thursday 1 February 2018, 3PM–4PM

ABSTRACT:

At CO2 injection sites, CO2 leakage from the storage formation
could be catastrophic. CO2 is a highly compressible fluid, typically injected at high pressure and temperature conditions. If this compressed CO2 reaches highly permeable conduits such as faults and fractures, CO2 could leak unabated to other formations (e.g. fresh water aquifers) and/or to the surface.

Assuming a fast-flow path to the surface, CO2 escaping from the storage formation instantaneously reaches the surface while experiencing adiabatic expansion, which results in Joule-Thomson cooling. The addressed eruptive mechanisms are analogues to natural CO2 eruption mechanisms, which are found in CO2-driven cold-water geysers around the world. A notable example of a CO2-driven cold-water geyser is the Crystal Geyser in central Utah. The fluid mechanics of this regularly erupting geyser was investigated by instrumenting its conduit with pressure, temperature, pH, EC, and dissolved oxygen sensors, measuring every 1 minute during and between eruptions.

Results of these measurements suggest that the time-scale of a single-eruption cycle is composed of four successive eruption types with two recharge periods ranging from 30 to 40 hours. Current eruption patterns exhibit a bimodal distribution although previous measurements and anecdotal evidence suggests that this pattern was different prior to recent seismic activity. This cold geyser’s eruptions are regular and predictable, and reflect pressure, temperature, EC, pH, and dissolved oxygen changes resulting from Joule-Thomson cooling, endothermic CO2 exsolution, and exothermic CO2 dissolution. Specifically, the perturbation of pressure and temperature data observed at the Crystal Geyser suggested the possibility of using temperature sensing technology within the observation well at the engineered CO2 sequestration site.

Seminar: An introduction to latest full-waveform sonic measurements

Dr. Baichun Sun, Curtin University Graduate

Title: An introduction to latest full-waveform sonic measurements

Held on Thursday 25 January 2018, 3PM–4PM

 ABSTRACT:

Borehole sonic logging tools have long been used to measure formation geophysical properties. I will talk about industry latest development of the sonic logging tool for open hole applications, including answer-product developments.

  1.  brief introduction about sonic logging,
  2. Capability of latest sonic logging tool,
  3. Tool  QC algorithms
  4. Velocity logs, including subarray examples
  5. VTI and HTI log examples.