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Meeting Location: 
Churrascos - River Oaks
2055 Westheimer Road
Houston, TX 77098

5:30 to 6:00 PM Happy Hour
6:00 to 7:00 PM Dinner
7:00 to 8:00 PM Presentation
8:00 until ...  Networking

Speaker: Mark Longacre, MBL, Inc. 

The Suriname-Guyana margin has a complex tectonic-magmatic evolution. In 2022, a 1-year long basin study project provided an integrated geophysical (potential fields and seismic reflection) and structural geology analysis of the Suriname margin and its impact on hydrocarbon prospectivity. The results provided a new model for the margin evolution, encompassing the complex interplay of Triassic rifting, CAMP magmatism, Jurassic oceanic crust formation, and Cretaceous transform margin development. 

The integration of detailed gravity and magnetic data into the crustal models was key in developing a new model for the margin evolution. Since the initial stage of rifting is Jurassic in age, the gravity and magnetic data was key in identifying the Jurassic crustal structure and stratigraphy on the margin. 

In contrast to some previous interpretations, our results show that the magmatic successions can be divided into older packages that do not have SDR geometries and are most likely CAMP-related. These form magmatic crust under the western Demerara Plateau with no continental crust. This magmatic crust has a complex thickness variation through time that we relate to the orientation and nature of the pre-break up crustal evolution. These older magmatic units are overlain by demonstrable NW- orientated SDRs that have limited extent. Folding of the magmatic, Jurassic, and Early Cretaceous stratigraphy includes the effects of differential subsidence and Aptian- Albian compression and transpression. 

This new interpretation has a profound impact on margin evolution and the conjugate margin restoration.

Speaker Biography: Mark B. Longacre, MBL Inc. 
Mark Longacre has been a professional geophysicist for the past 42 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 University 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 Purdue Earth, Atmospheric, and Planetary Science 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. In 1985 Mark was transferred to Denver and later that year joined Aqua Terra International, a gravity and magnetic consulting firm, as Manager of US Operations. 

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 32 years with MBL, Inc. Mark has traveled to over 65 countries doing a variety of specialized gravity and magnetic acquisition, processing, and interpretation projects for the oil and gas exploration industry.

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