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CPS/SEG 2004 International Geophysical Conference

作者： John Bain Stephen Williams Shawn Mulcahy John Ceron Fugro-LCT Houston Texas USA Fugro-LCT Houston Texas USA Fugro-LCT Houston Texas USA ecopetrol Bogota. Columbia

＜正＞ Gravity and magnetic methods remain powerful exploration tools. In fact, applications of gravity and magnetics are expanding: from regional investigation to the prospect-level. We present in this work two case histories. The first study involved an airborne gravity and magnetic exploration application in the Upper Magdalena Valley, an oil-prolific basin in the mountainous Andean Cordillera, Columbia. The second used gravity and magnetics to help seismic solve the complex salt problem in the U.S. deepwater Gulf of Mexico. Overall, we demonstrate that integration of different, independent methods such as gravity, magnetic, and seismic is a cost-effective, viable, and powerful solution to problems encountered in complex exploration environments.

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Fetkin-hydro,a new thermo-hydrological algorithm for low-temperature thermochronological modeling

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Geoscience Frontiers 2021年第3期12卷 186-200页

作者： Francisco Sánchez Andres Barrea Federico M.Dávila Andres Mora Centro de Investigaciones en Ciencias de la Tierra(CICTERRA) CONICET-UNCFCEFyNCiudad UniversitariaAv.Vélez Sarsfield 16115000 CórdobaArgentina Facultad de Matemática AstronomíaFísica y Computación(FAMAF)Ciudad UniversitariaAv.Medida Allende 21445000 CórdobaArgentina ecopetrol BotafogoRio de JaneiroBrazil

Despite two decades of major advances in the field of thermochronological modeling,state-of-the-art numerical implementations still rely mostly on burial and exhumation processes to explain radiometric *** though such an approach has proved valuable,failing to account for other first-order geological variables has led to misinterpretations and therefore,calls for a *** this study a new version of the Fetkin(finite element temperature kinematics,ecopetrol)program is *** new algorithm couples time-dependent hydrological and thermal calculations,thus rendering thermochronological ages that,instead of being solely dependent on the kinematical evolution of a system,conditioning by the fluid flow is also *** contrast with previous thermochronological models,this work considers the influence of effective stress on rock properties(porosity and permeability)and therefore,in thermal *** analyses addressing relevant geological questions show not only the versatility of the code but also,new perspectives on forward low-temperature thermochronological *** circulation through pure-sandstone settings produce colder thermal architectures than those obtained in impermeable *** in cooling ages from models with and without fluid circulation are up to 5 Myr.A 4-fold variation in thrusting rates(0.5 km/Myr to 2 km/Myr)produces a 15-Myr difference in cooling ages in models with fluid flow,which contrasts to much lower differences,only 2 Myr,in domains without(or minimal)fluid circulation.2D thermal solutions in fold-bend-fold thrust belts composed of sandstones remain static despite substantial relief development by kinematic folding.A case-study from Western Argentina,in the Andean Precordillera,confirms the plausibility of the numerical algorithm here posed and raises new questions on the first-order thermal controls in settings under deformation.

关键词： Thermochronology Hydrogeology Fluid flow Numerical modeling

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