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OCT Structure, COB Location and Crustal Type at Rifted Marins from Integrated Quantitative Analysis: Maximising the Value of Deep Long-offset Seismic Reflection Data

Author(s): Nick J. Kusznir Badley Geoscience, Hundleby, Lincolnshire, PE23 5NB, United Kingdom
Leanne Cowie Badley Geoscience, Hundleby, Lincolnshire, PE23 5NB, United Kingdom
Alan Roberts Badley Geoscience, Hundleby, Lincolnshire, PE23 5NB, United Kingdom
Paul Bellingham ION Geophysical, Egham, Surrey, United Kingdom
Brian Horn ION Geophysical Houston, TX, U.S.A.

The composition and thickness of crustal basement are critical to frontier hydrocarbon exploration in deep-water rifted continental margin settings. We apply a set a quantitative geodynamic analysis techniques based on interpretations of ION BasinSPAN seismic reflection data to investigate the structure and tectonics of deepwater rifted margins. These quantitative analytical techniques consist of:

(i) Gravity inversion, incorporating a lithosphere thermal gravity anomaly correction, to give Moho depth, crustal basement thickness, continental lithosphere thinning and remaining continental radiogenic crustal thickness (ii) RDA (residual depth anomaly) analysis, to give departures from oceanic bathymetry corrected for sediment loading using flexural backstripping. (iii) Subsidence analysis using 2D and 3D flexural backstripping to give the distribution of continental lithosphere thinning. (iv) Joint inversion of PSTM deep seismic reflection and gravity data to give lateral variations in basement density and seismic velocity.

The combined interpretation of these independent quantitative measurements are used together to determine OCT structure, COB location and crustal type. This integrated approach has been validated on the Iberian margin where ODP drilling provides ground-truth of ocean-continenttransition crustal structure, continent-ocean-boundary location and crustal type. Superposition of the 3D Moho surface determined from gravity inversion onto PSDM and PSTM seismic sections provides assistance to, and validation of, deep seismic reflection interpretation.

Examples of the application of the quantitative analysis of ION BasinSPAN deep long-offset seismic data are presented for the Black Sea Basin, NW shelf of Australia and offshore Uruguay & northern Argentina.


Title:
OCT Structure, COB Location and Crustal Type at Rifted Marins from Integrated Quantitative Analysis: Maximising the Value of Deep Long-offset Seismic Reflection Data
Type:
Oral
Origin:
Academia
Day:
2
Session:
1
Daily sequence no.:
02
Lead author last name:
Kusznir
Lead author first name:
Nick J.
Affiliation(s):
Badley Geoscience, Hundleby, Lincolnshire, PE23 5NB
Country:
United Kingdom
Abstract status:
All ok
UID:
35