EAGE Short Course Sunday

Microseismic Monitoring for the Energy Industry

Sunday

9 June 2024

CPD Points

5

Instructor

Leo-Eisner

Dr Leo Eisner 
President Seismik

Course Overview

The course describes principles of microseismic monitoring ranging from DAS, geophones and seismometers in borehole to surface and near surface networks. The examples range from conventional to unconventional production, through geothermal energy extraction to CO2 sequestration (CCUS). It allows professional understanding of the currently available methods and measurements made in passive seismic monitoring, their use and uncertainties associated with measurements. 

Examples of microseismicity monitored with the DAS monitoring systems, source mechanisms and tomography to reservoir simulations are discussed and assessed. Social and scientific aspects of induced seismicity related to energy industry will be also discussed.

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Course Objectives

  • Select the right type of microseismic monitoring array to meet the goals that need to be monitored
  • Design an optimal array for passive seismic (surface or downhole) monitoring, estimate in it uncertainties of locations for microseismic events
  • Calibrate velocity model
  • Mitigate hazards associated with induced seismicity by fluid injection
  • Determine if the seismicity in the vicinity of an oilfield is likely related to injection or extraction of fluids.

Course Outline

  1. Introduction: Definitions, a brief review of history of monitoring microseismicity: water reservoirs, mining, geothermal, CO2 sequestration.
  2. Instrumentations and earthquake monitoring: number of unknowns, type of sensors to meet our goals. Absolute location, relative location. P- and S-wave polarizations. Frequency content of microseismic data. Earthquake magnitudes.
  3. Downhole and surface monitoring: single well monitoring technique. Optimal design of downhole monitoring array. Velocity model building and calibration. Case study comparing the downhole and surface locations.
  4. Source mechanisms: concept of source mechanism, definition of dip, strike and rake for shear source. Description of shear, tensile, volumetric, CLVD components of source mechanism. Inversion for source mechanisms from borehole and surface monitoring. Magnitude: definition and determination, seismic energy, b-values and magnitude of completeness, stress drop, source dimensions.
  5. Seismicity in the vicinity of energy exploration. History of felt seismicity related to oil and gas industry. Differentiation of natural and induced seismicity. Seismic moment and total injected volume. Case studies. Hazard assessment and mitigation.
  6. Review of recent research effort and case studies in microseismicity. Models of relationship between microseismicity and hydraulic fracturing. Most important things to remember about microseismicity.

Participants’ Profile

The course is suitable professionals and researchers interested in passive seismic monitoring in geothermal, CO2 sequestration, waste disposal, and decarbonized and decarbonized energy production and development, students, geophysicists, researchers, investors, and government officials are welcome.

Prerequisites

Basic understanding of geophysics ideally seismology.
TimeActivity
08:00Departure from conference center Messe Wien
09:00 – 09:20Safety introduction ITC
09:20 – 10:50ITC / TECH Center & Lab
10:50 – 11:00Group exchange
11:00 – 12:30ITC / TECH Center & Lab
12:30 – 13:30Lunch at the ITC event area
14:30Arrival back at conference center Messe Wien
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