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Compound Specific Hydrogen Isotope Composition of Type II and III Kerogen Extracted by Pyrolysis-GC-MS-IRMS
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Author and Affiliation:
Socki, Richard A.(Jacobs Technology, Inc., Houston, TX, United States);
Pernia, Denet(BP America, Inc., Houston, TX, United States);
Evans, Michael(Texas A&M Univ., Dept. of Oceanography, College Station, TX, United States);
Fu, Qi(NASA Johnson Space Center, Houston, TX, United States);
Bissada, Kadry K.(Houston Univ., Petroleum Systems Research Inst., Houston, TX, United States);
Curiale, Joseph A.(Chevron Corp., Houston, TX, United States);
Niles, Paul B.(NASA Johnson Space Center, Houston, TX, United States)
Abstract: The use of Hydrogen (H) isotopes in understanding oil and gas resource plays is in its infancy. Described here is a technique for H isotope analysis of organic compounds pyrolyzed from oil and gas shale-derived kerogen. Application of this technique will progress our understanding. This work complements that of Pernia et al. (2013, this meeting) by providing a novel method for the H isotope analysis of specific compounds in the characterization of kerogen extracted by analytically diverse techniques. Hydrogen isotope analyses were carried out entirely "on-line" utilizing a CDS 5000 Pyroprobe connected to a Thermo Trace GC Ultra interfaced with a Thermo MAT 253 IRMS. Also, a split of GC-separated products was sent to a DSQ II quadrupole MS to make semi-quantitative compositional measurements of the extracted compounds. Kerogen samples from five different basins (type II and III) were dehydrated (heated to 80 C overnight in vacuum) and analyzed for their H isotope compositions by Pyrolysis-GC-MS-TC-IRMS. This technique takes pyrolysis products separated via GC and reacts them in a high temperature conversion furnace (1450 C) which quantitatively forms H2, following a modified method of Burgoyne and Hayes, (1998, Anal. Chem., 70, 5136-5141). Samples ranging from approximately 0.5 to 1.0mg in size, were pyrolyzed at 800 C for 30s. Compounds were separated on a Poraplot Q GC column. Hydrogen isotope data from all kerogen samples typically show enrichment in D from low to high molecular weight compounds. Water (H2O) average deltaD = -215.2 (V-SMOW), ranging from -271.8 for the Marcellus Shale to -51.9 for the Polish Shale. Higher molecular weight compounds like toluene (C7H8) have an average deltaD of -89.7 0/00, ranging from -156.0 for the Barnett Shale to -50.0 for the Monterey Shale. We interpret these data as representative of potential H isotope exchange between hydrocarbons and sediment pore water during formation within each basin. Since hydrocarbon H isotopes readily exchange with water, these data may provide some useful information on gas-water or oil-water interaction in resource plays, and further as a possible indicator of paleo-environmental conditions. Alternatively, our data may be an indication of H isotope exchange with water and/or acid during the kerogen isolation process. Either of these interpretations will prove useful when deciphering H isotope data derived from kerogen analysis. More experiments are planned to discern these two or other possible scenarios.
Publication Date: May 18, 2013
Document ID:
20130013718
(Acquired Jun 21, 2013)
Subject Category: GEOSCIENCES (GENERAL)
Report/Patent Number: JSC-CN-28418
Document Type: Conference Paper
Meeting Information: American Association of Petroleum Geologists (AAPG) Annual Convention; 19-22 May 2013; Pittsburgh, PA; United States
Meeting Sponsor: American Association of Petroleum Geologists, Inc.; Midland, TX, United States
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: HYDROCARBONS; HYDROGEN ISOTOPES; KEROGEN; NATURAL GAS; ORGANIC COMPOUNDS; PYROLYSIS; SHALE OIL; SHALES
Availability Notes: Abstract Only
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