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Understanding Sulfur Speciation And Producibility In Unconventional Plays

Thursday, 07 Nov 2019 @ 6:00 PM Past Event
Understanding Sulfur Speciation and Producibility in Unconventional Plays
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The Colombian Geoscientists Network, CGN would like to invite you to our technical talk for November 2019, a presentation that dives into Exploration for Unconventional resources with examples from South and North American basins.

Cost: $ 35 Price includes dinner & presentation. Seating is limited. Please register and secure your ticket at your earliest convenience by clicking the following link: Registration Walk-ins are also accepted; however, dinner is not guaranteed without a prior reservation. Cash payments from walk ins are also preferred. Price will increase to $40 after November 4th at midnight. For specific questions about the event, contact cgnhouston@gmail.com or Sandra Milson at +1 617-459-9196.

Abstract

The geochemical and petrophysical complexity of source-reservoirs in Liquid-Rich Unconventional plays (LRU) urges for the implementation of alternative analytical protocols for initial play assessment. Organic sulfur content in TOC-rich intervals determines the kinetic behavior of the organic matter, the quality of the oil, and its sour character. Additionally, the production of H2S, which is a toxic and corrosive gas, can pose financial burden on the companies and create hazards to the operators in the field. The amount of H2S could have a direct relationship with the presence of sulfur in productive layers, in addition to the known effects of thermochemical sulfate reduction. There has always been an interest to screen the amount and different forms of sulfur in reservoirs and source rocks. This has become more critical when dealing with unconventional self-sourced, organic rich plays, such as those in the Permian Basin, where source rock and reservoirs are adjacent. However, sulfur speciation is rarely incorporated in play assessment programs, due to the challenge posed by conventional methodologies for separating organic from inorganic sulfur moieties in the rocks.

Similarly, advanced pyrolysis methodologies are rarely part of analytical programs and their relationship with the NMR behavior of the OM in rocks are often ignored. To initially examine both producibility and sulfur species is challenging (and usually ineffective), or requires sophisticated analytical methods like XPS, XANES and/or NMR spectroscopy, etc. In this study, Advanced Rock-Eval pyrolysis methods (multi-heating rate methods, MHR and sulfur speciation) and high frequency-nuclear magnetic resonance (HF-NMR relaxometry)has been utilized to quantitatively separate and measure the different sulfur fractions (e.g., Total Organic Sulfur from mineral sulfur) and the chemical character of the different adsorbed hydrocarbon fractions, from the producibility point of view. Samples from selected source-reservoirs from South America and USA were analyzed by these modified analytical protocols in an attempt to better qualify and quantify different petroleum fractions (mobile, heavy hydrocarbons, viscous, solid bitumen), and thus provide valuable and refined information about producibility of target intervals during appraisal stages. In addition, the benefit of this advanced geochemical screening method is the elimination of the challenging task of dealing with chemicals for removing pyrite.

Dr Humberto Carvajal's Bio

Dr Carvajal is a seasoned geochemist, with diverse experience spanning many areas, including geochemical screening of source-rocks, organic petrology, petroleum geochemistry, and equipment operation/maintenance. He obtained his B.Sc. in Geology in 2004 from Universidad Industrial de Santander in Colombia, a M.Sc. in Geology and Petroleum Geochemistry from Iowa State University in 2007, and his Ph.D. In Geology and Geochemistry from Indiana University in 2012. He is currently the Geochemistry Laboratory Manager at the Core Laboratories Advanced Technology Center in Houston, where he has been since 2012.

Dr. Carvajals research experience spans from Astrobiology (stable isotope and molecular biosignatures in planetary systems) to the evolution of the carbon cycle and petroleum systems. Current research focus is on applications of advanced programmed-pyrolysis methodologies, stable isotope geochemistry of natural gas, and geochemical fingerprinting of fluids. He has several peer-reviewed publications in the fields of organic & petroleum geochemistry, and petroleum geology.

www.cgnhouston.org
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