POSC Specifications
Version 3.0
Epicentre Standard Values
seismic_pick_class

seismic_pick_class

Standard Instance Values

identifier naming _system description source version status
  naming _system .identifier     ref _version .identifier  
hydrocarbon indicator POSC seismic indicator A measurement which indicates the presence or absence of a hydrocarbon accumulation. Indicators include a bright spot, dim spot, phase or frequency change, flat spot, shadow zone, or velocity sag. POSC epicentre 2.1 current
bright spot POSC seismic indicator A local increase of amplitude. POSC epicentre 2.1 current
dim spot POSC seismic indicator A local decrease in amplitude. POSC epicentre 2.1 current
flat spot POSC seismic indicator A horizontal seismic reflection attributed to an interference between two fluids such as gas and water, or gas and oil. POSC epicentre 2.1 current
polarity reversal POSC seismic indicator A phase reversal of 180 degrees where a peak becomes a trough or vice versa. POSC epicentre 2.1 current
velocity sag POSC seismic indicator A low velocity anomaly resulting in pushing down horizons underneath a feature. POSC epicentre 2.1 current
velocity pullup POSC seismic indicator A high velocity anomaly resulting in pulling up horizons underneath a feature. POSC epicentre 2.1 current
amplitude shadow POSC seismic indicator A region of weakened amplitude underneath a possible hydrocarbon accumulation. POSC epicentre 2.1 current
phasing POSC seismic indicator A change in waveshape as a result of interference. POSC epicentre 2.1 current
gas chimney POSC seismic indicator A region of severely deteriorated data quality above a possible hydrocarbon accumulation (often associated with a velocity sag). POSC epicentre 2.1 current
low frequency shadow POSC seismic indicator A region of lowered instantaneous frequency underneath a possible hydrocarbon accumulation. POSC epicentre 2.1 current
reef indicator POSC seismic indicator A pattern which indicates the presence of a carbonate buildup. Indicators generally include loss of reflector continuity or velocity pullup. POSC epicentre 2.1 current
loss of continuity POSC seismic indicator A lateral interruption in one or more reflection events. POSC epicentre 2.1 current
draping POSC seismic indicator Sag in bedding around a feature such as a reef, usually as a consequence of differential compaction. POSC epicentre 2.1 current
strong POSC reflection amplitude The reflection event has a qualitiatively strong amplitude. POSC epicentre 2.1 current
medium POSC reflection amplitude The reflection event has a qualitatively average amplitude. POSC epicentre 2.1 current
weak POSC reflection amplitude The reflection event has a qualitatively weak amplitude. POSC epicentre 2.1 current
unknown POSC reflection amplitude It is not known what the strength of the reflection amplitude is. POSC epicentre 2.1 current
variable POSC reflection amplitude The amplitude of the event varies to the extent that it is not reasonable to classify with a single values POSC epicentre 2.1 current

seismic_pick_class

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identifier naming _system description source version status
strongly continuous POSC refelection continuity The event is qualitatively continuous across the area of interest. POSC epicentre 2.1 current
continuous POSC refelection continuity The event is qualitatively continuous across the area of interest, but is of lesser quality than strongly continuous and higher quality than weakly continuous. POSC epicentre 2.1 current
weakly continuous POSC refelection continuity The event is readily trackable, but has short extents of poor quality. POSC epicentre 2.1 current
faulted POSC refelection continuity Event continuity is interrupted by faulting rather than by seismic noise. POSC epicentre 2.1 current
poorly continuous POSC refelection continuity The event is barely trackable, with wide areas that are untrackable. POSC epicentre 2.1 current
untrackable POSC refelection continuity The event is not reasonable trackable from the seismic data. POSC epicentre 2.1 current
unknown POSC refelection continuity It is not known how continuous the event is. POSC epicentre 2.1 current

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