Seismic interferometry-by- deconvolution for controlled-source and passive data Kees Wapenaar, Joost van der Neut, Elmer Ruigrok, Deyan Draganov, Juerg.

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Presentation transcript:

Seismic interferometry-by- deconvolution for controlled-source and passive data Kees Wapenaar, Joost van der Neut, Elmer Ruigrok, Deyan Draganov, Juerg Hunzicker, Evert Slob, Jan Thorbecke 70 th annual EAGE meeting June 11, 2008 Rome

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

Seismic interferometry by cross-correlation

Uncorrelated noise sources

target virtual source Cross-correlation Seismic interferometry by cross-correlation

Summary: The correlation function is in a specific way related to the Green’s function e.g. Seismic interferometry by cross-correlation

Properties: Requires no knowledge about sources and medium Trace-by-trace process Sources on closed surface (except on free surface) Sensitive to irregular source distribution Medium is assumed lossless

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

Correlation approach:

Deconvolution approach:

Correlation approach: Deconvolution approach: data

Correlation approach: Deconvolution approach: Correlation function Deconvolution function data

Wapenaar and Verschuur, 1996, Delphi Amundsen, 1999, SEG, Wapenaar et al., 2000, SEG Holvik and Amundsen, 2005, Geophysics Schuster et al., 2006, Geophysics Seismic interferometry by deconvolution target (reservoir) Reflection response R + Upgoing wavefield P - Downgoing wavefield P +

OBC example (1996) Seismic interferometry by deconvolution

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

Correlation approach: Deconvolution approach:

Correlation approach: Deconvolution approach:

Correlation approach: Deconvolution approach:

Correlation approach: Deconvolution approach:

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

van der Neut et al., Thursday 14:55 P272

black = directly modeled red = retrieved Cross-Correlation PP reflection

Deconvolution black = directly modeled red = retrieved PP reflection

Cross-Correlation directly modeled retrieved black = directly modeled red = retrieved PP reflection

directly modeled retrieved Deconvolution black = directly modeled red = retrieved PP reflection

black = directly modeled red = retrieved PS reflection Cross-Correlation

black = directly modeled red = retrieved PS reflection Deconvolution

directly modeled retrieved Cross-Correlation black = directly modeled red = retrieved PS reflection

directly modeled retrieved Deconvolution black = directly modeled red = retrieved PS reflection

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

USArray

Cross-correlation

Deconvolution

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51 with

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51 with

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51 with

▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ 1 … 26 … 51 with

(a) Correlation t (s) Cross-correlation

t (s) (b) Deconvolution Deconvolution

Ground Truth:Cross-correlation:

Ground Truth:Deconvolution:

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

Correlation approach: Deconvolution approach: The correlation function and the deconvolution function are each in a specific way related to the Green’s function

Correlation approach: Deconvolution approach:

Correlation approach: Deconvolution approach:

Review of seismic interferometry by cross-correlation Seismic interferometry by deconvolution Introduction Theory Controlled-source data (‘virtual source’) Passive data (surface wave retrieval) Passive data (transmission-to-reflection) Theory (revisited) Conclusions Contents

Seismic interferometry by cross-correlation Requires no knowledge about sources and medium Trace-by-trace process Seismic interferometry by deconvolution Requires no knowledge about sources and medium Can deal with one-sided illumination Irregular source distribution Dissipation allowed (e.g. CSEM)

59 CSEM by deconvolution (Slob et al.) 2D TM-examples for shallow and deep sea Blue curves: no reservoir Red curves: with reservoir

60 Electric field Magnetic field

61 Down going Up going

62 Deconvolved result not dependent on sea depth

CSEM by deconvolution Solve: and are decomposed diffusion fields. Correlation method not applicable

64 Numerical example: Seabed Logging in shallow sea overburden effect 2D TM-examples for receivers in horizontal well Blue curves: no reservoir Red curves: with reservoir

65 Electric field Magnetic field

66 Down going Up going

67 Deconvolved result not dependent on overburden

Random source distribution 100 sources + 20 in cluster A + 30 in cluster B Center freq of wavelet: 20 Hz Dispersion receivers in array 1 21 receivers in array 2

Correlation approach: Deconvolution approach:

‘Virtual source’ by cross-correlation Evaluate: ‘Virtual source’ by deconvolution Solve: Cross-correlation method is an approximation of deconvolution method

Conclusions Correlation method: trace-by-trace process Deconvolution method: Regular receiver grid Irregular source distribution Dissipation allowed