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Crustal Structure of the Ranger Discovery Based on the Integration of High-Resolution Seismic with 2-1/2 & 3-Dimensional Gravity and Magnetic Modelling

Southeast Caribbean Research Symposium Presentation
AAPG Distinguished Lecture

Author(s): Mark Longacre (presenter), MBL, Inc.

This study, based on the integration of high-resolution long offset seismic data with 2-1/2 and 3-dimensional gravity and magnetic modeling, has revealed the crustal / basement structure of the Ranger discovery offshore deep-water Guyana. Two (2) 2-1/2D and one (1) 3D gravity and magnetic models have been generated showing the unique basement structure underpinning the Ranger discovery. The Central Atlantic opening generated Jurassic aged oceanic crust and resulted in a trans-extensional margin in relationship to the Guyana Craton continental crust. This trans-extensional opening created unique basement structures one of which is associated with the Ranger discovery. Determining the tectonic origin of the Ranger basement structure will help in exploring for other similar features along the Atlantic margin.


Mark Longacre, MBL

Mark earned a BS in Geology from the University of Wisconsin-Milwaukee and a MSc in Geophysics from Purdue University.

With 39 years of experience in the industry, he is President of MBL, Inc., in Denver, Colorado, where he is responsible for detailed Interpretation integrating gravity and magnetics with other geological and geophysical data.

Mark is a member of AAPG, SEG, EAGE, AGU, PESGB, and Fellow at the Geological Society of London.

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