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Quality control and risk assessment of seismic profiles using area-depth-strain analysis

Richard H. Groshong
Quality control and risk assessment of seismic profiles using area-depth-strain analysis (in Balancing, restoration, and palinspastic reconstruction, Oskar Vidal-Royo (prefacer), Thomas E. Hearon (prefacer), Christopher D. Connors (prefacer), Stuart Bland (prefacer), Frauke Schaefer (prefacer), Oriol Ferrer (prefacer), Andres Mora (prefacer), Jose de Vera (prefacer), Chris A. Guzofski (prefacer), Fernando Rodriguez (prefacer), Eric Jean-Philippe Blanc (prefacer) and Alan Vaughan (prefacer))
Interpretation (Tulsa) (November 2015) 3 (4): SAA1-SAA15

Abstract

Area-depth-strain (ADS) analysis is a method for quantifying the structural style, balance, boundary displacement, detachment locations, and subseismic strain from a seismic profile, information that is particularly useful for quality control and risk analysis. The method is based on measurements of excess area, width, depth, and bed length of multiple horizons in a structure. A balanced structure is indicated by a well-defined line or lines on an area-depth graph. The structural uncertainty or risk of the interpretation is quantified using the fit of the data to the least-squares line(s), the match between the ADS detachment values and the interpreted geometry, and the magnitudes of the calculated strains. The method also clearly separates syntectonic (growth) units from nontectonic (pregrowth and no-growth) units. Different area-depth graph styles represent (1) classic detachment folds, fault-propagation folds, and ramp anticlines; (2) buckle-style detachment folds; and (3) fault-bend folds. The focus here is on the first two. Numerical models of the detachment fold styles show the similarities and differences between their geometries and ADS interpretations. Both styles are evaluated with seismic profiles across oilfield-scale structures. The Alpha/Bobo field, Nigeria, is a classic detachment fold, and an Angolan anticline is of the buckle style. Profiles across the Alpha/Bobo field before and after the first well was drilled demonstrate the improvement in the ADS interpretation of the lower detachment location and the reduction of layer-parallel strains in the revised profile. The Alpha/Bobo field and the Angola fold illustrate the distinction between growth and no-growth intervals and the interpretation of growth strata. Both fields show the use of predicted versus observed ADS results to suggest possible improvements to the interpretation.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 4
Title: Quality control and risk assessment of seismic profiles using area-depth-strain analysis
Title: Balancing, restoration, and palinspastic reconstruction
Author(s): Groshong, Richard H., Jr.
Author(s): Vidal-Royo, Oskarprefacer
Author(s): Hearon, Thomas E., IVprefacer
Author(s): Connors, Christopher D.prefacer
Author(s): Bland, Stuartprefacer
Author(s): Schaefer, Fraukeprefacer
Author(s): Ferrer, Oriolprefacer
Author(s): Mora, Andresprefacer
Author(s): de Vera, Joseprefacer
Author(s): Guzofski, Chris A.prefacer
Author(s): Rodriguez, Fernandoprefacer
Author(s): Blanc, Eric Jean-Philippeprefacer
Author(s): Vaughan, Alanprefacer
Affiliation: Consultant, Tuscaloosa, AL, United States
Affiliation: Midland Valley Exploration, Glasgow, United Kingdom
Pages: SAA1-SAA15
Published: 201511
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
Accession Number: 2016-007510
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: sects.
N04°15'00" - N05°00'00", E05°00'00" - E07°30'00"
Secondary Affiliation: ConocoPhillips, USA, United StatesWashington and Lee University, USA, United StatesCairn Energy, GBR, United KingdomWintershall, DEU, GermanyUniversitat de Barcelona, ESP, SpainInstituto Columbiano de del Petroleo, COL, ColombiaShell, USA, United StatesChevron, USA, United StatesBHP Billiton, USA, United StatesStatoil, NOR, Norway
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201604
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