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Home My WebLink AboutGMC Data Report No. 245 Pyromat kinetic model of coal from cuttings (9,220' - 9,260') of the Norton Sound Exxon Corporation DCS Y-0407-1 (Yellow Pup No.1) well. ~ GEO¿ o 0Q :;; Ç(:) ~ ~6 6° ~ ----- '/ ß: ~¡ALS 6#7 See GMC Data Report No. 242 Received 24 June 1995 Total of 3 pages in report Alaska Geologic Materials Center Data Report No. 245 .) 18 .. 16 - 14 - Norton Sound Coal Exxon #1 9220-60' 12 - 10 - 8 - 6 - 4 - 2 - lIIm_mIlmR_1 o - I ¡ f~ ~ ~~ ~! ~! ~ ~¡ 1J . w ''!!! ij m f~ ;: ~) ~ ~ ~ ~ II r i I I I I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C\J C\J C'I C'I C\J C\J C'I C'I C\J C'I C'I C\J C\J C'I LC? LO LC? LC? LC? LC? LC? LC? LC? It) LC? LC? LC? LC? 0 ; C'I C':) -:t LC? CD ¡-.. co CJ) 0 ,.... C\J C':) -:t -:t -:t -:t -:t -:t -:t -:t -:t LC? LC? LC? LC? E, cal/m 01 o 0 000 000 0 0 C'I C'I C\J C\J C\J C'I C'I C\J C'I C'I LC? LC? LC? LC? LC? LC? LC? LC? Il) Il) -:t LC? CD ¡-.. co CJ) 0 ,.... C'I C':) Il) LC? Il) Il) LC? Il) CD CD CD CD Corrected Pyromat Kinetic Model A = 1 X 1014S·1 1.00.............................................................··...........·...·..........·..............................................................................mm.........m.......................; Fraction cal/mol 0.13 40520 0.36 41520 0.31 42520 0.42 43520 0.56 44520 0.76 45520 0.26 46520 2.12 47520 0 48520 4.26 49520 13.25 50520 16.64 51520 15.32 52520 12.6 53520 5.12 54520 7.58 55520 1.46 56520 5.82 57520 0 58520 3.63 59520 2.66 60520 0 61520 0 62520 6.73 63520 0.90 . O.BO . 0.70 . 0.60 . 0.50 . 0.40 . 0.30 . 0.20 . 0.10 . 0.00 70 GMC Data Report No. 245 3"C/My Heating Rate Kimmeridge Clay Fm. Norton Sound Coal 90 110 130 Tern perllture. ·C Herrin Coal 150 170 190 1/3 ~ Mobil Exploration, and Producing Technical Center FARMERS BRANCH P.O. BOX 819047 DALLAS. TEXAS 75381·9047 Date: May 19, 1995 To: Fred Stone, MEPTEC George Claypool, l\1EPTEC PYROMAT KINETIC MODEL OF COAL FROM NORTON SOUND, EXXON #1 WELL Ve..l 10 t..J f'v.f' .:Ji L JOB NO. BGWOOA o<:_-s Y -... ($4.1· ~:>'~1 As you requested, I have determined a kerogen decomposition kinetic model for the coal from Norton Sound (Exxon #1, 9220-9260 feet) using the Pyromat II micropyrolyzer. This technique was developed by geochemists at the Lawrence Livermore National Laboratory. I Small quantities (l0-100 mg) of rock or kerogen are pyrolyzed at different temperature ramp rates (1 to 56°C/min). The pyrograms are then fitted using a program called KINETICS resulting in a distribution of activation energies (E, kcal/mol) for either a single predetermined or best-fit frequency factor (A, sec·I). The kinetic parameters derived from Pyromat experiments are inaccurate for direct use in basin modeling. When compared to field observations, Pyromat kinetics are "too slow" and will result in lower kerogen conversion than measured. In a tield study of Maracaibo Basin, Venezuela, LLNL researchers found that the Pyromat activation energies should be shifted downwards by ~2 kcal/mol for the modeled results to agree with the field data.2.3 This correction is required because of an experimental artifact associated with the inefficient volati1ization and transport of the pyrolysates at low temperatures « 350°C). We have recently calibrated kinetic models derived from Pyromat, hydrous pyrolysis, and MSSV methodology to a set of field test data on the Kimmeridge Clay Formation and have developed a means of correcting the Pyromat kinetic parameters based on the reactivity of the kerogen.4 I Braun R.L.. Burnham A.K., Reynolds J.O. and Clarkson J.E. (1991) Pyrolysis kinetics for lacustrine and marine source rocks by programmed micropyrolysis. Energy & Fuels 5, 192-204. 2 Sweeney 1., Burnham A., Talukdar S. and Valejos e. (1989) Pyrolysis kinetics applied to prediction of oil generation in the Maracaibo Basin, Venezuela. Org. Geochem.16, 189-196. 3 Burnham A.K., Braun R.L.. Sweeney J.1., Reynolds 1.0., Vallejos G. and Talukdar S. (1992) Kinetic modeling of petroleum formation in the Maracaibo Basin: Final report, Annex XII. US DOE Report No. DOEfBC-92001051, July. 4 Walters e.e., Claypool G.B., Theis N.K.. Acholla F. and Mitchell T.O. (1995) A method to correct Pyromat kinetic models to conform with field observations. MEPTEC Lab. Memorandum. in preparation. GMC Data Report No. 245 2/3 The corrected kinetic model for the Norton Sound Coal is shown and listed below. The distribution of activation energies is typical of other vitrinitic coals that we have analyzed by the Pyromat technique. When a 3°C/My heating rate is applied, the Norton Sound Coal behaves much more like the reference Herrin Coal sample than the Kimmeridge Clay Formation sample. Please contact me (BM 381-8456) if you have any questions concerning the data or their interpretation. ~¿d~ Clifford C. Walters Supervisor, Geochemistry Labs Petroleum Systems cc: B.C. Griffiths S.J. Moncrieff J.W. Stinnett M.B. Toon (Geochemistry Files) Technical Information CCWalters Enclosures GMC Data Report No. 245 3/3