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Microseismic Data Exchange Standards
Stewart A. LevinStanford University
And the whole earth was of onelanguage and of one speech.
Genesis 11:1Genesis 11:1The Tower of BabelThe Tower of Babel
What do we want?
• Unambiguous meanings
• Flexibility
• Comprehensive scope
• Efficiency
• Simple decoding
• Leverage existing standards (NIH)
• Protected by and protection from IP issues
Acceptance of SEG Standards
SEG-D
SEG SPS
SEG-Y
SEG ADS
SEG RODESEG RODE
SEG Polarity
Digital RecordersDigital Recorders
Marine Energy SourcesMarine Energy Sources
Marine StreamersMarine Streamers
MT/EMAPMT/EMAP
SEG P1,P2,P3
SEG SI Metric
SEG-2SEG-2
SEG A,B,C,EX
- OGP
SEG-D recap
• Acquisition data transfer and archive
• Four revisions since 1975 release
• Complex decoding– “I’d die first before using SEG-D!”
• Creation limited to approximately 50 manufacturers
SEG-Y recap
• Most often used for processed seismic delivery
• One revision* since 1975 release
• Simple decoding– 2 & 4 byte integer headers, integer or floating pt
samples
• Used by thousands of companies and institutions
* Undergoing second revision
SEG RODESEG RODE recap
• API RP66 standard applied to seismic
• Highly flexible– Can bundle all sorts of metadata with traces
• Quite complex– 20+ basic data types– Many bit field manipulations– SEG committee SEG-Y example wrong!
• Used by a small handful of companies
What do we really want?
(a) Long lifetime
(b) Simple format to read and write
or
(b’) Comprehensive format limited to a few specialists
Let’s talk microseismic
• Acquisition– Mix of passive and active data– Very long traces– Sensor orientations– Accurate time stamps– Precise locations– Sizeable ancillary data– In field processing, e.g. rotations
• All supported in SEG-D 3.0
Let’s talk microseismic
• Processing– Input SEG-D– Output is not seismic section
• Is there a need for a new/updated SEG standard?– No: Energistics project underway– Yes: SEG-Y upgrade underway– Maybe: SEG-2 upgrade proposal exists
An Invitation
SEG-Y rev 2 needs YOU!