BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CiviCRM//NONSGML CiviEvent iCal//EN X-WR-TIMEZONE:America/Chicago METHOD:PUBLISH BEGIN:VEVENT UID:CiviCRM_EventID_2556_d3319be4f90071e87b81b1178ed41494@www.hgs.org SUMMARY:HGS Luncheon: Tectonics of South Texas and Mexico DESCRIPTION:HGS Zoom Luncheon \n \n Wednesday\, May 22\, 12:00 PM Noon to 1:10 PM\n \n Virtual Meeting Online\n \n Tectonic Setting and Petroleum \;Systems of the Seno Mexicano (South Texas and Northeastern M exico): An Initial Synthesis\n \n Luncheon Speaker : \; Dr. Tom Ewing\, Senior Geologist\, Fronte ra Exploration Consultants\n \n Seno Mexicano (Sou th Texas and the Burgos Basin of Mexico) is a prol ific Cenozoic gas-rich hydrocarbon province\, as s hown by a fresh compilation and estimation of prod uction. The Texas part of the basin (RRC-4) has pr oduced an estimated 107 trillion cubic feet of gas (Tcfg) and 3\,604 million barrels of oil (MMbo) b etween 1920 and 2000\; 76% of the gas and 76% of t he oil has come from major fields greater than 50 Bcfg or 10 MMbo (casinghead gas and condensate not included). The Mexican part (Burgos Basin) has pr oduced 16 Tcfg (12.3 Tcfg in major fields)\, about 15% of total production.\n \n The 183\,000 km2 Se no Mexicano basin (99\,000 km2 onshore) overlies p oorly known\, highly extended continental crust re lated to the Jurassic formation of the Gulf of Mex ico. Salt was likely deposited across much of the basin\, but few onshore salt diapirs are known. Th e area lay east of the Jurassic and Cretaceous she lf margins\, accumulating 1500-3000 m of limestone \, clay\, and organic deposits in deep-water envir onments.\n \n Regional eastward tilting began by t he Paleocene\, forming the Lobo gravity slide and rafting Mesozoic sediments eastward above Jurassic salt\, forming the deep Rosita and Premont trough s and intervening Mesteñ\;a raft. \; Com pensatory compression (fold or thrust belt) must o ccur downdip in the Coastal Zone near the present shoreline\, perhaps pushing salt into the Bravo sa lt diapir. Laramide folding on northwest-southeast axes affected the southern part of the basin in t he Middle Eocene.\n \n Subsequent Oligocene to Mio cene tilting induced the Vicksburg slide (Early Ol igocene)\, progradation of major deltaic units\, a nd the consequent deflation of the long\, broad Br avo diapir\, extrusion of the Sigsbee canopy and c ompression in the Perdido and Port Isabel foldbelt s (Late Oligocene-Early Miocene). Continued Neogen e tilting onshore created a pronounced sub-Goliad unconformity (Late Miocene) and uplifted the Borda s Escarpment (post-Miocene to Recent).\n \n \n \n Production from major fields occurs in four major Cenozoic gas trends and three oil trends: the Lobo trend (Paleocene\, 12.3 Tcfg\, dry gas)\; the Wil cox Fault Zone (FZ) trend (Lower-Middle Eocene\, 1 3.7 Tcfg\, dry gas)\; the Vicksburg FZ trend (Olig ocene\, 27.4 Tcfg with condensate\; plus oil rims for 861 MMbo)\; the Frio FZ trend (Upper Oligocene \, 24.0 Tcfg with slight condensate)\; the Duval o il trend reservoirs (Upper Eocene\, 516 MMbo)\; th e Nueces oil area (Oligocene\, 1062 MMbo)\; and th e deep-water Perdido oil trend (Eocene\, 317 MMbo through 2019). Within each trend\, plays may be de fined by stratigraphic intervals and trap styles.\ n \n The Seno Mexicano contains two world-class Me sozoic oil and gas source rock intervals (Upper Ju rassic and mid-Cretaceous)\; source rocks also are likely to occur in the Paleocene-Eocene slope/bas in sediments. \; The Mesozoic source rocks hav e been deeply buried and are overmature at present . The nearly dry gas in the Lobo and Wilcox trends was probably sourced from the Eagle Ford as it pa ssed through the gas window\, perhaps enhanced by gas from the thick Eocene fill of the Rosita Troug h. \; Gas-condensate of the Vicksburg and Frio reservoirs (Vicksburg FZ and Frio FZ trends) and oil in the Nueces area\, however\, must have been primarily sourced from Paleogene (probably Eocene) strata of the inner Coastal Zone. \; Oils in the Duval trend are gas-poor and degraded\, but in dicate a downdip marine Eocene source in or just b elow the oil window. \; The lack of major Mioc ene production suggests absence of source rock in the outer Coastal Zone and the Bravo trough\, wher e Eocene rocks are probably not present.\n \n Abou t the Speaker: Tom Ewing\n \n \n \n Dr. Thomas Ewi ng is a geoscientist with over forty-three years o f experience in hydrocarbon exploration and resear ch. He is a Registered Professional Geoscientist i n the State of Texas (#1320) and the State of Loui siana (#468) and an AAPG/DPA Certified Petroleum G eologist (#4538) and holds certification #1610 fro m SIPES. He can be contacted at tewing@fronteraexp loration.com.\n \n Tom received a B.A. in Geology from Colorado College (1975)\, an M.S. in Geochemi stry from New Mexico Institute of Mining and Techn ology (1977). Ewing earned a Ph.D. in Geological S ciences from the University of British Columbia in 1981. \n \n Dr. Ewing was a research geologist fo r four years at the Texas Bureau of Economic Geolo gy in Austin\, where he served as a co-author of t he Atlas of Texas Oil Reservoirs\, and compiled th e Tectonic Map of Texas. \; Since 1985 he has been an owner of Frontera Exploration Consultants\ , Inc.\, a San Antonio-based geoscience consulting company. He worked with Venus Oil and Venus Explo ration from 1985 to 2005 as a staff consultant and Senior Explorationist\, playing a main role in it s successful exploration in the Yegua Trend of the Gulf Coast Basin and elsewhere in Texas. \n \n Ew ing has served in many offices in AAPG and its Div isions\, He served as Vice-President for Sections of AAPG (2012-14). He received Honorary Membership in the South Texas Geological Society in 2009\, H onorary Membership in the GCAGS in 2010\, AAPG Dis tinguished Service Award\, and BEG Alumnus of the Year in 2011. Most recently he has completed servi ce as President of the GCAGS (2016-2017). In 2018 he was awarded the "\;Don Boyd Medal for Excel lence in Gulf Coast Geology"\; from the GCAGS (Gulf Coast Association of Geological Societies)\, their highest award. In 2021 he received Honorary Membership in AAPG\, and in 2023 the Berg Researc h Award from AAPG. In 2023 he also received the Mo nroe Cheney Science Award from the Southwest Secti on of AAPG. The 2024 GeoGulf Transactions was dedi cated to him.\n \n Tom Ewing has spoken extensivel y at local\, regional\, and national geological me etings and published over 100 papers and abstracts . Among other awards\, he has received the AAPG Le vorsen Award three times\, twice in Gulf Coast Sec tion and once in Southwest Section. He has written articles on Gulf Coast geology and hydrocarbons\, the geology and tectonics of Texas\, and history and urban geology of the San Antonio area. He wrot e the popular guidebook "\;Landscapes\, Water and Man: Geology and Man in the San Antonio Area&q uot\; published by the South Texas Geological Soci ety in 2008. In 2016\, Dr. Ewing completed Texas T hrough Time\, an illustrated book and website on t he geologic history and earth resources of Texas p ublished by the Bureau of Economic Geology. Subseq uently\, he has authored chapters on the tectonic evolution of the Permian Basin (Ruppel volume\; BE G) and on the geological development of the Gulf o f Mexico Basin (Miall volume\, with W.E. Galloway\ ; Elsevier).\n \n In his spare time\, he directs a 30-voice German men'\;s chorus\, the San Anton io Liederkranz\, and a 20-voice womens'\; choru s\, the Beethoven Damenchor.\n \n  \; CATEGORIES:General Lunch CALSCALE:GREGORIAN DTSTAMP;VALUE=DATE-TIME:20240522T120000 DTSTART;VALUE=DATE-TIME:20240522T120000 DTEND;VALUE=DATE-TIME:20240522T131500 URL:https://www.hgs.org/civicrm/event/info?reset=1&id=2556 END:VEVENT END:VCALENDAR