NEW LOCATION

The Black Lab Pub
4100 Montrose
Houston, TX  77006

NOTE: You Must Be Logged in to Register

Speaker: Mark Longacre, MBL, Inc.

This study, based on the integration of high-resolution long offset seismic and 2D gravity modeling, has determined the crustal structure and depth to Moho for the Guyana Basin offshore Guyana. Three (3) gravity models have been generated showing the different crustal types associated with the two tectonic phases, Jurassic and Cretaceous, for opening of the basin. Previous interpretations suggested the NW-SE Central Atlantic opening generated Jurassic aged oceanic crust and resulted in a transform margin in relation to the Guyana Craton continental crust. However, this study shows there was an initial period of extension on the margin before translational movement. That Jurassic aged crust transitions from a typical oceanic crust near the border with Venezuela to a “transitional” crust near the border with Suriname. A second transform margin exists between the Jurassic oceanic crust and the Cretaceous oceanic crust that formed during the opening of the Equatorial Atlantic. Mapping the crustal thickness, crustal type, crustal boundaries, and depth to Moho is extremely important to understanding the tectonic evolution of the basin and its impact on hydrocarbon generation. 

Speaker Biography: Mark Longacre, MBL, Inc.
Mark Longacre has been a professional geophysicist for the past 37 years working exclusively as a gravity and magnetic specialist for the oil and gas exploration industry.

Mark graduated from the University of Wisconsin – Milwaukee in 1978 with a Bachelor of Science degree in geology. He then attended Purdue and graduated with a Master of Science degree in Geophysicist in 1981. His thesis advisor was Professor William Hinze, now a Professor Emeritus in the EAPS department.

Mark started his career in San Francisco with Sohio Petroleum in 1981 as a potential field geophysicist in the Special Projects Group. In 1982 Mark was transferred to Dallas, where he earned an MBA degree in Technical Management from the University of Dallas, and then to Denver. In 1985 Mark joined Aqua Terra International, a gravity and magnetic consulting firm, as Manager of US Operations in Denver.

Then in 1991, Mark started MBL, Inc., a gravity and magnetics consulting company in Denver. MBL, Inc. specializes in the acquisition, processing, and integrated interpretation of gravity and magnetic data for the oil and gas exploration industry. In 1999, Mark opened a second office in London, England.

Over the past 27 years with MBL, Inc. Mark has traveled to over 60 countries doing a variety of specialized gravity and magnetic projects for the oil and gas exploration industry.

**This year, there is no registration fee for our SIG meetings. Dinner and drinks are available from the establishment's menu. We ask that you continue to pre-register, to prepare meeting room set up.

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