POSC Specifications Version 3.0 |
Epicentre Standard Values seismic_pick_class |
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 | . | ![]() |
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 |