Madeleine Strum EPA OAQPS strummadeleineepagov VOC SPECIATION Transforms inventory species VOC into Air Quality model species to support the chemistry of the model VOC speciation feeds into the ozone and secondary organic aerosol chemistry ID: 602484
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Slide1
EPA Oil and Gas VOC Speciation Improvement Efforts
Madeleine Strum, EPA, OAQPS (
strum.madeleine@epa.gov
) Slide2
VOC SPECIATION
Transforms inventory species (VOC) into Air Quality model species to
support the chemistry of the
model VOC speciation feeds into the ozone and secondary organic aerosol chemistrySPECIATE is EPA’s repository of speciation profiles SPECIATE4.5 update slated for Sept 2016Speciation could also be used to estimate HAPs from VOCs
VOC
Assign
Speciation Profile based on Process (SCC)
Apply Profile to compute emissions of chemical compounds
Map chemical compounds to Air Quality model speciesSlide3
Oil and Gas Profiles Added to SPECIATE4.5
All location-specific, All Uncontrolled
WRAP Profiles – Modeling contractor
D-J, Piceance, Powder River, Permian Basin, South San Juan, SW Wyoming, Uinta, Wind RiverUnita Basin Tribal Minor Source Registration (TMSR) –From Region 8D-J Condensate Tanks – From ORD/Region 8, published paper, measurement studySan Joaquin – From SPECIATE contractor – 2 studies (measurements)
East Texas – From SPECIATE contractor – measurementsCA- Bakersfield – From SPECIATE contractor - measurements/adjustmentsSlide4
WRAP Profiles
D-J
,
Piceance, Powder River, Permian Basin, South San Juan, SW Wyoming, Uinta, Wind RiverProcessesFlashing – condensate tanks, oil tanks (Uinta)Produced Gas – non-CBM, CBM (some basins)Already widely used in modelingVintage ~2006, based on measurements of gas composition and models (tanks), composited across operators (ranging from 1-28 samples)http://
www.wrapair2.org/pdf/WRAP_P3_OG_speciation_rev27Aug2015.pdf Slide5
Uinta TMSR Profiles
Uinta basin
Processes
Condensate Tanks and Oil TanksUntreated natural gas (leaks, pneumatic devices)Glycol dehydratorOperator Specific (~40) and production-weighted compositesVintage ~2013, based on measurements of gas composition and models (TANKS, GLYCALC)Slide6
D-J Condensate Tank Profiles
Measurements-
Samples were acquired from condensate tank thief hatch leaks or other emission point prior to the control device
27 sample specific and one composite based on meanHalley L. Brantley, Eben D. Thoma & Adam P. Eisele (2015): Assessment of VOC and HAP Emissions from Oil and Natural Gas Well Pads Using Mobile Remote and Onsite Direct Measurements, Journal of the Air & Waste Management Association, DOI: 10.1080/10962247. Slide7
San Juaquin
Censullo
– added 3 composites of SPECIATE4.4 profiles
Tests from 1989 Oil field wells, Oil field tanks, Oil field Vapor recoveryA. Censullo, California Polytechnic State University, San Luis Obispo, "Development of Species Profiles for Selected Organic Emission Sources; Volume I: Oil Field Fugitive Emissions", ARB Contract A832-059, April 30, 1991. USGS – added sample specific and compositesTests from ~ 200377 sample specific. Sites described as “Oil well” “gas and condensate well” ; some are more detailed “gas well separator”
6 composites: gas wells, oil wells, oil and gas separators, oil well tanks, oil well casings, gas and oil condensate wellsOverlap with Censullo data; Less compounds than Censullo (10 vs 59)U.S. Geological Survey, Professional Paper 1713, Petroleum Systems and Geologic Assessment of Oil and Gas in the San Joaquin Basin Province, California, 2007, http://pubs.usgs.gov/pp/pp1713/
7Slide8
Bakersfield, CA
Petroleum operations - extraction, processing,
transmission
Reflects ambient data (not source)Combined of observed data w/regressionsEmissions of organic carbon and methane from petroleum and dairy operations in California’s San Joaquin Valley, Atmos. Chem. Phys., 14, 4955–4978, 2014 8Slide9
Next Steps
Assign these new profiles to inventory sources (GSREF) for use in SMOKE
Update flare profile (next version of SPECIATE)
9Slide10
Opportunities for Improvements
More data for more sources/basins
Standard terminology/naming system
Consistency in estimation of HAPs in NEI vs speciation where possibleHow do SCCs reflect sources of data in SPECIATE? – e.g., Liquid vs gas serviceHow to handle speciation of controlled streams10