PESGB Member? Log in
 

Events

Aberdeen Evening Lecture February

This event is now over.

The Copthorne Hotel, Aberdeen

February 21

1830

2017 1Q, 2Q Distinguished Lecturer

Getting more for less: Frequent low-cost seismic monitoring solutions for offshore fields

Presented by Paul Hatchell

Shell, Houston, Texas, USA

 

 

 

Time-lapse seismic reservoir surveillance is a proven technology for offshore environments. In the past two decades, we have seen this technology move from novel to necessary and enable us to monitor injection wells, water influx, compaction, undrained fault blocks, and bypassed reserves. Value is generated by influencing the management of our field operations and optimizing wells to reduce cost, accelerate production, and increase ultimate recovery.

 

Significant advances in technology are improving the quality of our data. Errors in acquisition repeats are nearly eliminated using permanently installed systems or dedicated ocean- bottom nodes. We now routinely obtain surveys with such a high signal-to-noise ratio that we can observe production-induced changes in the reservoir after months instead of years. This creates a demand for frequent seismic monitoring to better understand the dynamic behavior of our fields. Increasing the frequency of seismic monitoring will have a proportionate cost

implication, and a challenge is how to design a monitoring program that maximizes the overall benefit to the field.

 

Reducing individual survey costs is important to enable frequent monitoring. Several techniques are considered for lowering these costs such as:

 

  • Reducing the number of shots and/or receivers to minimize offshore vessel time. This includes shooting targeted (i4D-style) surveys on a frequent basis in between full-field surveys that are acquired infrequently.
  • Use of smaller source arrays towed by less-expensive vessels.
  • Semi-permanent ocean-bottom nodes that can be left on the seafloor for multiple on-demand surveys.
  • Time-lapse VSPs that use permanent distributed acoustic sensors (DAS) in well bores.
  • High-resolution 4D surveys that monitor shallow reservoirs cost effectively using low-cost vessels towing arrays of short-streamer cables (e.g., P-cable).

 

There is no single solution that works for every field, and we need to understand the pros/cons of the various technologies to select the best option for a specific field. Some results of applying these techniques to offshore fields will be discussed.

Next event

GEOLiteracy Festival - Kimmeridge Bay, April 8 →

Events RSS Feed Events

GEOLiteracy Festival - Kimmeridge Bay

April 8

GEOLiteracy Festival - Kimmeridge Bay, Dorset Field Trip and Evening Reception 

GEOLiteracy Festival - Lyme Regis

April 9

GEOLiteracy Festival - Lyme Regis Afternoon lecture

Lochnagar Hike

April 9

Join the PESGB YP’s for an epic hike through the Cairngorm National Park.

See all events

News RSS Feed News

Petroleum Systems of North Africa ...

Posted on: March 28, 2017

Review

CarbonateReservoirs

Posted on: March 27, 2017

Africa Conference

Exhibition Booths go on General Sale 

Posted on: March 8, 2017


See all news

© PESGB 2017
PESGB, 7th Floor, No1. Croydon, 12-16 Addiscombe Road, Croydon, CR0 0XT. Charity Number: 1085619
Tel: +44 (0)20 7408 2000 Fax: +44 (0)20 7408 2050 Email: pesgb@pesgb.org.uk
© PESGB 2010