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LIVE WEBINAR – Octio Gravitude: gWatch Cost-Effective Reservoir Monitoring

Tuesday, 17 November @ 11:00 am - 12:00 pm (Australia/Perth time)

Free – $10

To view the event video and associated handouts (if any), please either log in to your active PESA membership account or enter the event password you received when you registered for this event.

Guest Speaker(s): John Even Lindgård

John Even is responsible for business development at OCTIO Gravitude. Geophysics at heart, John loves to talk about the new technologies and their potential to change the status quo in the oil and gas service industry. John has extensive experience in the oil and gas service industry and has led multiple management roles at OCTIO Gravitude. John Even holds a Master’s degree from the Norwegian University of Science and Technology (NTNU) and has 5 approved patents in Norway within geophysical monitoring.

Kindly supported by Rock Flow dynamics


This live webinar will take place at:

11am              – Perth
12.30pm        – Darwin
1pm                – Brisbane
1:30pm          – Adelaide
2pm                – Canberra, Hobart, Melbourne, Sydney

Use the calendar link on this page to add this event in to your own calendar at the correct local time for your location.

Tickets are free for members (please log in to see this) and $10 for non members.

Please buy your tickets and immediately follow the link in the ticket e-mail (not the calendar invite or this webpage, which is just generic and not event specific) to set up your registration with the webinar software well in advance of the time of the talk. Once registered with the webinar software you will receive a reminder e-mail 1 hour beforehand.



Octio Gravitude: gWatch Cost-Effective Reservoir Monitoring

Presented by John Even Lindgård



Gravimetry and subsidence surveys have been used to monitor hydrocarbon producing reservoirs in the Norwegian continental shelf for over two decades (Alnes et al., 2010). This technology provides insight into reservoir dynamics with short turnaround time and cost-efficiency when compared with 4D seismic.

As opposed to time-lapse seismic, gravity is sensitive to density changes alone, thus its interpretation is not subject to ambiguities from competing signals from e. g. pressure-induced changes in the elastic properties of the reservoir. A typical application of gravity is mapping and quantifying aquifer influx in gas fields. This provides valuable information for the prediction of water breakthrough in wells. Furthermore, aquifer influx is a key element for understanding the mass balance in the reservoir and for a better estimation of hydrocarbon volumes in place. (Agersborg et al., 2017).

Seafloor subsidence is also sensitive to important reservoir and overburden properties. It is directly related to compartmentalization, and it can be a key factor for the safety of the installations. It is an observable effect of geomechanical changes happening in the reservoir and the overburden. Seafloor subsidence has been used to identify undepleted compartments; determine the drilling-window for in-fill wells; understand aquifer properties; improve the geomechanical model hence the interpretation of seismic time-shifts.

In some fields like Aasta Hansteen or Mikkel (Vevatne et al., 2012), geophysical monitoring strategies rely exclusively on gravimetry and subsidence surveys. In others, like Ormen Lange, the complementarity with seismic is exploited by interleaving frequent gravimetry-subsidence acquisitions and less frequent seismic (Vatshelle et al., 2017).

gWatch monitoring is conducted using remotely operated vehicles and a survey usually lasts from one to five weeks depending on the field size.


Tuesday, 17 November
11:00 am - 12:00 pm
(Australia/Perth time)
Free – $10
Event Categories:
  • Venue

    The internet Australia

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    Non member
    $ 10.00 inc GST