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GMC Data Report No. 006
IN REPLY REFER TO: United States Department of the Interior GEOLOGICAL SURVEY Box 25046 Denver Federal Center Denver, Colorado 80225 Office of Energy Resources Branch of Oil and Gas Resources January 5, 1977 Mr. Thomas R. Marshall Chief Petroleum Geologist Division of Oil and Gas 3001 Porcupine Drive Anchorage, Alaska 99501 Dear Mr. Marshall: Enclosed are the results of our analyses of samples from the following wells, furnished to us by your office. Standard Oil Company of California North Fork Unit 41- 35 Sec. 35~ T45, R14W SM Standard Oil Company of California Anchor Point No. 1 Sec. 10~ T5S, R15W SM Our general interpretation of these analyses is that both sections are thermally immature with respect to liquid petroleum hydrocarbon generation. In addition, the organic matter in most of the sediments analyzed does not yield a significant amount of hydrocarbons upon pyrolysis (Pyrolytic HC/ Organic Carbon < 207.)~ suggesting that the sediments are not potential oil source rocks. An exception to this generally unfavorable oil source potential is the deeper part of the North Fork section (i.e., from 11,900 to 12,500 feet). Samples from this interval have very good organic richness (~-27. organic carbon) and undergo relatively high conversion of organic matter to hydrocarbons upon pyrolysis (pyrolytic HC/Organic Carbon > 407.). The organic matter in these sediments is, however, thermally immature at tht~: loca...l~it.y~ and would appear to require further burial metamorphism equivalent to about five thousand feet of additional overburden to be considered effective oil source rocks. The organic-rich (dominantly coaly) Tertiary section is known to be productive of gas. Our investigations are primarily aimed at evaluation of oil source potential. RECEIVED Copy to: L. Sincerely, George E. Claypool, Research Chemist Branch of Oil and Gas Resources SOC]~L-~orth Fork Unit 41-35 - Ditch cuttings Item Depth Organic Pyrolytic HC Volatile HC Pyrol. HC Interval Carbon yield content Org. Carbon (ft.) wt. 1. 1500-30 1.19 0.25 2. 5010-20 16.2 3.00 3. 5530- 40 17.2 3.80 4. 6150-60 3.69 ' 0.53 5. 6610-2- 4.62 0.65 6. 7100-10 36.8 4.60 7. 7740-50 30.2 8. 8220-30 12.9 9. 8890-8900 '14.8 10. 9260-70 15.1 11. 10,240-50 15.2 3.77 1.50 2.90 3.10 2.76 12. 10,540-50 14.8 2.20 13. 10,890-900 4.76 0.45 14. 11,060-70 4.33 0.68 15. 11,340-50 2.28 0.30 16. 11,520-30 1.82 0.38 17. 11,900-10 2.26 1.00 18. 12,060-70 1.87 0.55 19. 12,300-10 2.15 0.89 20. 12,490-500 1.87 0.82 21. 12,780-90 1.40 0.15 Truax oC $10 21.0 460 1830 18.5 464 1380 22.1 458 540 lk. 4 462 · 260 14.1 460 1510 12.5 452' 1330 12.5 458 580 11.6 456 1090 19.6 458 770 20.5 460 790 17.8 462 720 14.9 460 93 9.5 462 225 15.7 462 110 13.2 464 135 20.9 464 430 44.3 462 190 29.4 464 225 4'1.4 464 260 43.9 466 120 10.7 464 · llth Descripti( coal/f.g./clast 5/95/o 20/40~40 40~20/40 10/20/70 15/85/o 7O/lO12O 80110110 60/30110 40/40/20 50/30/20 30/50/20 40/30/30 15/8o/5 15/70/15 5/70/25 5/85/lO 0/90/10 0/95/5 0/90/10 0/90/10 2188/lO SOC~.~.L-~nchor Point No. 1 - Ditch Cuttings Item Depth Organic Pyrolytic HC Interva 1 Carbon yield (ft.) wt.% wt. °/o 1. 5090-5100 21.0 3.08 2. 6050-'50 15.0 2.03 3. 7000-10 9.34 1.60 4. 7980-90 6.38 1.22 5. 8840-50 2.30 0.33 6. 9100-10 1.23 0.14 7. 9590- 9600 4.12 O. 50 8. 10,030-40 1.93 0.30 9. 10,220-30 1.41 0.25 10. 10,730-40 1.11 0.10 11. 11,110-20 8.66 1.22 12. 11,350-60 0.95 0.09 13. 11,640-50 1.72 0.24 14. 12,140-50 0.54 0.06 15. 12,340-50 0.45 0.05 16. 12,800-10 8.66 0.90 17. 13,120-30 0.98 0.1'5 18. 13,720-30 1.07 0.18 19. 13,990-14,000 1.94 0.25 20. 14,340-50 0.68 0.10 21. 14,510-00 0.78 0.14 Volatile HC content ppm · 960 770 530 5OO 110 220 220 270 190 140 380 140 2OO 100 100 28O 170 170 190 180 2.0 Pyrol. HC Org. Carbon ?o 14.6 13.5 17.1 19,.1 14.3 11.4 12.1 15.5 17:7 9.0 14.1 9.5 14.0 11.1 11.1 10.4 15.3 16.8 12.9 14.7 17.0 Tmax oC 462 458 462 460 468 468 462 466 464 466 460 464 466 464 468 462 470 472 466 470 470 lith Descripti~ coal/f, g~clas ti, 50/30/20 25/75/0 15/65/2o. 30/30/40 15/8o/5 5/95/0 5/85/lO lO/9O/O 2~58~40 2170128 35/5o/15 219o/8 5/75/20 2~50~48 0~50~50 40/30/30 2/49/49 2~58~40 6/50/50 o/5o/5o 0/70/30
