Gabriel Alvarez. Long Period Multiples Short Period Multiples.

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Transcripción de la presentación:

Gabriel Alvarez

Long Period Multiples Short Period Multiples

CMP Offset Time Multiple Primaries Offset Time Multiple Primaries NMOed CMP

Lower stacking velocities compared with primaries Offset Time Multiple Primaries Parabolic residual moveout after NMO correction with primaries’ velocities Larger-curvature hyperbolas than primaries Characteristics of Multiples V1 V2 V1<V2 Offset Time Multiple Primaries

Seismic Section Time (S)

Velocity Analysis. CDP 640 with multiples Time (ms)

Velocity Analysis. CDP 4300 with multiples Time (ms)

Energy Source: Dynamite, 1 shothole 10’ Acquisition Parameters Line Length: 75 Km Fold: 30 Shot Interval: m Group Interval: m

Cable Layout TR. 1 TR. 60TR. 61TR. 120 S.P m m.

FFID 625 Time (s) Frequency (Hz) Amplitude

FFID 2155 Frequency (Hz) Amplitude Time (s)

Multiples Offset Time Primaries Offset Time Primaries and Multiples Offset Time

Moveout0 Radon Transform Offset Time Primaries y Multiples Time Moveout0 Parabolic Radon Transform Multiples Offset Time Primaries Offset Time Offset Time CMP

Offset (m) Time (s) Parabolic Radon Transform Time (s) Moveout (ms) CMP

CDP Primaries Offset Time (s) Offset Time (s) CDP Multiples

Supergathers. Primaries and multiples Time (s)

Supergathers. Primaries Time (s)

Supergathers. Multiples Time (s)

CMP Stack. Multiples with Velocity of Multiples Time (s)

CMP Stack. Multiples Time (s)

Comparison of primaries and multiples PrimariesMultiples

Migrated Stack. Primaries and Multiples Migrated Stack. Primaries Migrated Stack. Primaries and Multiples Migrated Stack. Primaries y MultiplesMigrated Stack. Primaries Migrated Stack. Primaries and MultiplesSección migrada. Primarios y MúltiplesMigrated Stack. Primaries y MultiplesMigrated Stack. Primaries and Multiples Time (s) CDP

Velocity Analysis. CMP 640 Primaries and Multiples Time (ms)

Velocity Analysis. CMP 640. Primaries Time (ms)

Comparison of Velocity Analysis. CMP 640 With multiplesWithout multiples

Velocity Analysis. CMP Primaries and multiples Time (ms)

Velocity Analysis. CMP Primaries Time (ms)

Comparison of Velocity Analysis. CMP 4300 With multiples Without multiples

CMP Time (s) Velocity (m/s) Stacking Velocity Profile Primaries Stacking Velocity Profile Primaries and Multiples Stacking Velocity Profile Primaries Stacking Velocity Profile Primaries y Multiples Stacking Velocity Profile Primaries Stacking Velocity Profile Primaries and Multiples Stacking Velocity Profile Primaries Stacking Velocity Profile Primaries y Multiples Stacking Velocity Profile Primaries Stacking Velocity Profile Primaries and Multiples Stacking Velocity Profile Primaries Stacking Velocity Profile Primarios y Múltiples Stacking Velocity Profile Primaries

Stacking Velocity Profile. Multiples Velocity (m/s) CMP Time (s)

Muiltiple attenuation can be as critical an issue with land data as it is with marine data. Conclusions Subsurface Seismic Interpretation is valid for primaries only. The presence of multiples makes stacking velocity more difficult and unreliable.

Questions ?

V1 V2 V1<V2 Reflectors Primaries Surface Offset Time ModelCMP Gather Primaries Multiples V1 V3 CMP V1

Sección migrada. Primarios y Múltiples Sección migrada. Primarios

Sección migrada. Primarios y Múltiples

Sección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. Primarios

Velocidades de apilado bajas en comparación con los primarios Características de los Múltiples Presentan curvatura (moveout) residual parabólica luego de la corrección de NMO con las velocidades de los primarios Sus hipérbolas tienen mayor curvatura que las de los primarios

CMP Stack. PrimariesCMP Stack. Primaries and Multiples CMP Stack. Primaries CMP Stack. Primaries and MultiplesCMP Stack. PrimariesCMP Stack. Primaries and multiples CMP Stack. Primaries CMP Stack. Primaries and multiplesCMP Stack. Primaries CMP Stack. Primaries and multiples CMP Stack. Primaries and Multiples Time (s)

Sección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y MúltiplesSección migrada. PrimariosSección migrada. Primarios y Múltiples

 Hampson-Russell (HR) Software Used  Promax  Seismic Unix (SU)