Marine magnetotellurics for base salt mapping: Gulf of Mexico field‐test at the Gemini structure

Marine Magnetotellurics for Base Salt Mapping - a Gulf of Mexico Field Test

61st EAGE Conference and Exhibition ◽

10.3997/2214-4609.201407644 ◽

1999 ◽

Author(s):

G. M. Hoversten ◽

S. Constable ◽

H. F. Morrison

Keyword(s):

Gulf Of Mexico ◽

Field Test ◽

Marine Magnetotellurics ◽

Base Salt

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Salt mapping in the Gulf of Mexico using marine magnetotellurics

First Break ◽

10.3997/1365-2397.26.1288.28409 ◽

2008 ◽

Vol 26 (6) ◽

Author(s):

S.K. Sandberg ◽

X. Wu ◽

T. Roper

Keyword(s):

Gulf Of Mexico ◽

Marine Magnetotellurics

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Subsea Mudlift Drilling: Planning and Preparation for the First Subsea Field Test of a Full-Scale Dual Gradient Drilling System at Green Canyon 136, Gulf of Mexico

10.2118/71358-ms ◽

2001 ◽

Cited By ~ 5

Author(s):

J.P. Schumacher ◽

J.D. Dowell ◽

L.R. Ribbeck ◽

J.C. Eggemeyer

Keyword(s):

Gulf Of Mexico ◽

Field Test ◽

Full Scale ◽

Drilling System ◽

Dual Gradient

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The effects of base-salt relief on salt flow and suprasalt deformation patterns — Part 2: Application to the eastern Gulf of Mexico

Interpretation ◽

10.1190/int-2016-0088.1 ◽

2017 ◽

Vol 5 (1) ◽

pp. SD25-SD38 ◽

Cited By ~ 12

Author(s):

Tim P. Dooley ◽

Michael R. Hudec

Keyword(s):

Gulf Of Mexico ◽

Early Stage ◽

Flow Direction ◽

Complex Salt ◽

Complex Model ◽

Physical Models ◽

Eastern Gulf Of Mexico ◽

Fold Belts ◽

Base Salt ◽

Salt Flow

In the eastern Gulf of Mexico, the pattern of early stage salt flow is complicated by basement topography consisting of a series of plunging arches that trend obliquely to the early flow direction. Seismic lines downdip of the Florida Middle Ground Arch reveal a puzzling array of structures. Sections trending roughly north–south (parallel to the regional dip) document predominantly extensional structures; however, east–west sections reveal shortening structures. Both sets of structures occur well updip of the downdip salt pinchout. We designed a physical-modeling study to investigate these puzzling relationships. Models presented in Part 1 of this paper indicate that localized shortening and extension can occur as salt passes over simple base-salt steps. Physical models were run with complex salt isopachs featuring plunging arches oblique to dip and salt flow. Models reveal the formation of shortening belts as the salt and its thin prekinematic overburden are translated across the arches. The complex salt isopachs deflect salt flow to produce convergent and divergent flow, which, along with flow-velocity gradients, results in the rotation of early formed thrust belts. Rotations of up to 70° were recorded in the most complex model, resulting in transported fold belts with trends that were close to dip parallel, similar to those observed on seismic data from the eastern Gulf of Mexico. Additional zones of shortening are found in and around complex salt pinchouts in the updip zones of the gravity-gliding system. The dynamic nature of these salt-related tectonic systems can result in the downdip translation of fold belts far from the basement topography over which they were created.

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