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SUMMARY:Simultaneous and coded seismic sources: Present and upcoming techn
 ologies - Raymond Abma - BP America
DTSTART:20171107T110000Z
DTEND:20171107T130000Z
UID:TALK87401@talks.cam.ac.uk
CONTACT:Raymond Abma - BP America
DESCRIPTION:Simultaneous source seismic surveys\, using a method referred 
 to as source blending\, use more than one seismic source at a time. This t
 echnology is part of the progression of seismic surveys to obtain denser s
 ampling and better seismic images. Simultaneous sourcing uses multiple sei
 smic sources\, producing seismic signals that overlap with the signals fro
 m the other seismic sources. This increases the efficiency of seismic expl
 oration by decreasing the time between shots\, significantly reducing the 
 cost and time needed to acquire a seismic survey. The main challenge to th
 e use of simultaneous sources is the separation of signals from the differ
 ent sources. This separation is accomplished by using concepts from compre
 ssive sensing by way of sparse inversion\, a method of getting the simples
 t answer to the inversion of a matrix equation. While this involves a sign
 ificant computational expense\, the decrease in the acquisition cost is ev
 en more substantial. I will show examples of various BP simultaneous sourc
 e seismic surveys and share some details about how they were acquired and 
 processed. I will also cover some of the requirements for a successful sim
 ultaneous source survey and an analysis of the quality of the seismic data
  obtained. Present simultaneous source surveys use the random activation o
 f the shot times as a code to allow shot separation. I will provide some s
 peculation about extending this coding to other possible coding methods. A
 mong some other advantages\, these new types of coded sources allow the ex
 tension of simultaneous source survey geometries to more general seismic s
 urvey types\, in particular\, towed-streamer acquisition.
LOCATION:Rayleigh seminar room\, 2nd floor\, Maxwell Building\, Cavendish 
 laboratory
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