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AAPG Bulletin, Vol. 90 (2006), Program Abstracts (Digital)

7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006

ABSTRACT: Previous HitPhaseNext Hit and Polarity Issues in Modern Seismic Interpretation

Alistair R. Brown
Consulting Reservoir Geophysicist, 1911 Country Brook Lane, Allen, TX 75002, phone: +1-214-544-7183, fax: +1-214-544-0452, [email protected]

Zero Previous HitphaseNext Hit is the objective of almost all seismic data processing today and its interpretive benefits are well known. However it is difficult to achieve. No more than 50% of seismic data achieves zero Previous HitphaseNext Hit sufficiently closely for its benefits and accuracy to be properly enjoyed. Furthermore 90 degree Previous HitphaseNext Hit is a remarkably common accident and, if not identified, can cause havoc to detailed seismic interpretation.

All interpreters should know how to visually assess the Previous HitphaseNext Hit and polarity of their data. I regularly meet those who discover late in the interpretation that the data has a different Previous HitphaseNext Hit or opposite polarity to what was first thought. In this paper recommendations for Previous HitphaseNext Hit and polarity assessment will be made, and several Previous HitphaseNext Hit circles will be presented.

For zero Previous HitphaseNext Hit data time and amplitude are colocated, and many interpretive procedures on modern workstations are based on this fact. For other phases complications arise, because time and amplitude are in different locations. Suggestions will be offered for handling the all-too-common 90 degree Previous HitphaseTop data.


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