Tuesday, May 15, 2018 - GSA Luncheon

The End Game of Arc Magmatism: Using Geochronology and Geochemistry to
Understand How Arcs Shut Off

Noon Luncheon 11:30-1:00 pm

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LUNCHEON ABSTRACT

The intrusive rate in magmatic arcs appears to vary over time. Geochronologic data from exhumed arc plutons suggest that many arcs experience periods of high magmatic flux (aka, ‘flare ups’) interspersed with periods of low magmatic flux or complete cessation of magmatism. The cause(s) of these variations in magmatic flux remain a subject of intense debate within the geologic community and have important implications for arc behavior and melt generation. This presentation will discuss new geochemical and isotopic data from the Black Peak intrusive complex, a mid-Cretaceous pluton in the North Cascades of Washington that was emplaced at the end of a major flare up. These new data, when coupled with previously published high-precision U-Pb geochronology on the same samples, suggest a link between the development of a garnet-bearing crustal root and an apparent magmatic lull in the region.

SPEAKER BIOGRAPHY

Erin Shea, University of Alaska Anchorage, Anchorage

Erin Shea is an assistant professor of geological sciences at the University of Alaska Anchorage. Her research interests are focused on magma generation, arc behavior, and high-precision geochronology.


Thursday June 7, 2018 - Special AGS Lecture

Integration of Experimentally Derived Rock Properties into Characterization Workflow

Noon Luncheon 11:30-1:00 pm

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LECTURE ABSTRACT

The integration of plug and log scale characterization is key to generating representative petrophysical and geomechanical models at all stages from exploration and development to production. The importance of plug measurements is especially vital in finely laminated rocks where well-log scale measurements miss mechanical heterogeneities that are required for realistic mechanical models. The presence of mechanical heterogeneity and anisotropy under the well log resolution is commonplace in unconventional plays and can deeply impact geomechanical assessments ranging from wellbore integrity to horizontal stress estimates. Yet, in order to fully realize the value of lab-based geomechanical characterization, it appears critical that laboratory workflows be optimized in terms of both outputs and turnaround times. In this talk, we present an in-house core scanner for fast and non-destructive physical property measurements (not just scanning) of elastic, transport and compositional properties of rocks at a very fine scale (down to mm) as well as a set of workflows to incorporate aforementioned properties in unconventional reservoir characterization.

SPEAKER BIOGRAPHY

Ramil Ahmadov New England Research, Inc., Houston, Texas

Ramil Ahmadov is a Principal Geoscientist at New England Research. Prior to joining NER, Ramil has held various roles at BP and Ikon Science. He has over 10 years of experience in conducting pure and applied research in the area of rock physics, quantitative interpretation and petrophysics. Ramil has considerable experience integrating laboratory, well log, seismic and production data within integrated multidisciplinary teams at all stages from exploration and development to production.

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