Seismic-to-Well Correlation of Seismic Unconformities at Leg 150 Continental Slope Sites

Lorenzo, Juan M.; Hesselbo, Stephen P.

doi:10.2973/odp.proc.sr.150.031.1996

Cited by 6 publications

(5 citation statements)

References 42 publications

(34 reference statements)

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“…ODP Leg-150 sites were located on lines 1005 and 1027 of the Ewing 9009 seismic grid. Synthetic seismograms have been used to tie the reflections to the boreholes (Lorenzo and Hesselbo, 1996) where they have been dated (Mountain et al, 1994;Mountain et al, 1996b;Miller et al, 1996). These correlations have been traced to line 1003 and the rest of the Ewing 9009 seismic grid.…”

Section: Database For the New Jersey Marginmentioning

confidence: 99%

Reconstruction of Tertiary progradation and clinoform development on the New Jersey passive margin by 2-D backstripping

et al. 1999

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We have reconstructed the Oligocene to Middle Miocene paleobathymetry and stratigraphy of the New Jersey margin using a modified backstripping technique. By analyzing the geometry of the margin through time, we investigate its response to fluctuating sea level, changing climate, and variable sediment supply during the Tertiary. The reconstructions reveal a change in the margin morphology from a more steeply dipping (1 : 300 to 1 : 500) carbonate ramp in the Eocene to a flatter shelf with a sharp shelf edge at present. This was accomplished by an increase in the terrigenous sediment supply that filled available accommodation and caused progradation across the margin. We link the increase in sediment flux with climatic cooling rather than tectonic processes. The progradation is evidenced by a series of clinoforms whose formation was modulated by sea level and which extend over 100 km across the shelf. The height and dip of the clinoforms increased as they extended onto the deeper parts of the earlier ramp. The Miocene clinoform rollovers at the New Jersey margin had water depths of ¾60-130 m and are interpreted as the edge of a new continental shelf built over the older ramp. Sea-level fall was probably insufficient to drive the Miocene shorelines past the shelf breaks. Thus, measurements of sea-level amplitude based upon 'coastal' onlap over the clinoforms are not reliable.

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Section: Database For the New Jersey Marginmentioning

confidence: 99%

Reconstruction of Tertiary progradation and clinoform development on the New Jersey passive margin by 2-D backstripping

et al. 1999

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show abstract

“…In an approach such as this, an actual reflection seismic data will be a single trace taken from a multichannel, stacked, migrated, reflection seismic section intersecting a well or borehole location, as used in many standard seismogram modelling approaches (Lorenzo & Hesselbo 1996;Tandon et al 1998).…”

Section: N U M E R I C a L E X P E R I M E N T Smentioning

confidence: 99%

Simulation-enhanced fracture detection: research and demonstration in U.S. basins

Ortoleva

2005

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“…As the present study concentrates on the development and the robustness of the technique, we used a seismogram from a 30 • C km −1 basin simulation as a proxy for 'observed' data rather than using actual reflection seismic data. In an approach such as this, an actual reflection seismic data will be a single trace taken from a multichannel, stacked, migrated, reflection seismic section intersecting a well or borehole location, as used in many standard seismogram modelling approaches (Lorenzo & Hesselbo 1996;Tandon et al 1998).…”

Section: N U M E R I C a L E X P E R I M E N T Smentioning

confidence: 99%

Estimating tectonic history through basin simulation-enhanced seismic inversion: geoinfomatics for sedimentary basins

Tandon¹,

Tuncay²,

Hubbard³

et al. 2004

Geophysical Journal International

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S U M M A R YA data assimilation approach is demonstrated whereby seismic inversion is both automated and enhanced using a comprehensive numerical sedimentary basin simulator to study the physics and chemistry of sedimentary basin processes in response to geothermal gradient in much greater detail than previously attempted. The approach not only reduces costs by integrating the basin analysis and seismic inversion activities to understand the sedimentary basin evolution with respect to geodynamic parameters-but the technique also has the potential for serving as a geoinfomatics platform for understanding various physical and chemical processes operating at different scales within a sedimentary basin.Tectonic history has a first-order effect on the physical and chemical processes that govern the evolution of sedimentary basins. We demonstrate how such tectonic parameters may be estimated by minimizing the difference between observed seismic reflection data and synthetic ones constructed from the output of a reaction, transport, mechanical (RTM) basin model. We demonstrate the method by reconstructing the geothermal gradient. As thermal history strongly affects the rate of RTM processes operating in a sedimentary basin, variations in geothermal gradient history alter the present-day fluid pressure, effective stress, porosity, fracture statistics and hydrocarbon distribution. All these properties, in turn, affect the mechanical wave velocity and sediment density profiles for a sedimentary basin. The present-day state of the sedimentary basin is imaged by reflection seismology data to a high degree of resolution, but it does not give any indication of the processes that contributed to the evolution of the basin or causes for heterogeneities within the basin that are being imaged. Using texture and fluid properties predicted by our Basin RTM simulator, we generate synthetic seismograms. Linear correlation using power spectra as an error measure and an efficient quadratic optimization technique are found to be most effective in determining the optimal value of the tectonic parameters. Preliminary 1-D studies indicate that one can determine the geothermal gradient even in the presence of observation and numerical uncertainties. The algorithm succeeds even when the synthetic data has detailed information only in a limited depth interval and has a different dominant frequency in the synthetic and observed seismograms. The methodology presented here even works when the basin input data contains only 75 per cent of the stratigraphic layering information compared with the actual basin in a limited depth interval.

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Seismic-to-Well Correlation of Seismic Unconformities at Leg 150 Continental Slope Sites

Cited by 6 publications

References 42 publications

Reconstruction of Tertiary progradation and clinoform development on the New Jersey passive margin by 2-D backstripping

Reconstruction of Tertiary progradation and clinoform development on the New Jersey passive margin by 2-D backstripping

Simulation-enhanced fracture detection: research and demonstration in U.S. basins

Estimating tectonic history through basin simulation-enhanced seismic inversion: geoinfomatics for sedimentary basins

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