OSEG meeting: Thursday 9th September, 2010 At 18:15
EAGE Distinguished Lecture: How to Acquire & Process Fit For Purpose 4D Seismic, Jonathan Brain
This meeting is kindly sponsored & hosted by WesternGeco at Gamle Borgenvei 3,N-1383, Asker (map).
Taxis will be arranged to and from the meeting leaving at 17:30 from Lysaker (outside PGS), Skøyen (outside Fugro) and Høvik (outside CGGVeritas). Please send a mail to mail@oseg.no if you wish to catch one of these indicating which location you want to catch the taxi from. If none of the locations are convenient OSEG will refund the cost of a taxi if you give the treasurer the receipt. Taxis will be arranged after the lecture returning to National Theatret.
Agenda
· 18:15 - 18:30 Registration
· 18:30 – 18:40 Info from the sponsor
· 18:40 – 20:40 Lecture Lecture Description
4D (time-lapse) seismic is now an established reservoir management tool and has been applied widely around the globe to a variety of reservoir types and production mechanisms. In this lecture we look at how to plan, acquire and process 4D surveys to achieve the required repeatability for given scenarios.
After a basic introduction to 4D, we begin by discussing the fundamental origins of noise on 4D data and the implications for 4D interpreting different types of 4D signals. We then investigate the relationship between acquisition (positioning) non-repeatability and 4D noise and look at the acquisition options currently available in the industry, considering the relative quality vs. cost implications. Through the careful application of a deterministic sequence, 4D processing can correct some, but certainly not all, imperfections in 4D acquisition. The methodology and objectives of such a sequence is explained.
The lecture will include data examples from many fields and will conclude with an extended case study from the Bittern field. In 2008 a time-lapse survey was acquired to identify and understand the direction of movement and geometry of the water flood front from both aquifer and water injection wells. The project is made more challenging by the presence of a gas chimney over almost the entire field, which drastically reduces seismic data quality. With careful pre-work including the construction of a velocity model incorporating laterally varying anisotropy, well repeated acquisition, and dedicated 4D processing, we were able to confidently interpret the 4D water sweep signal under the gas chimney and identify a number of field development opportunities.
About the Lecturer
Jon started his career in 1990 as a Seismic Processing Geophysicist with Geco. He joined Shell in 2000 and quickly became involved in 4D projects. He is currently Shell Europe’s 4D Focal point involved in all aspects of 4D projects from feasibility and planning through to interpretation and reservoir model calibration. He is also a Shell, Subject Matter Expert for both ‘4D Processing’ and ‘4D Feasibility and Interpretation’ advising on 4D projects globally.
He holds a BSc in Physics from Imperial College and an MSc in Exploration Geophysics from Leeds University
Food and drinks provided following the seminar. Welcome!
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