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GMC Data Report No. 052
Mobil Exploration and Producing Services January 7, 1981 DALLAS, TEXAS 75221 Dr. William Van Alen Alaska Oil & Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501 Dear Dr. Alen' ESC REQUEST NO. 311A78 BIOSTRATIGRAPHY, VISUAL KEROGEN ANALYSIS , AND THERMAI MATURATION STUDIES , PAN AI~.IERiCAN NAPATUK CREEK #] BETHEL EASIN, ALASKA This report describes the biostratigraphy, visual kerogen analysis and thermal maturation studies of the Pan American Napatuk Creek #1 well, Bethel Basin, Alaska. Diatom age-determinations and paleoecological interpretations were made on 13 ditch samples taken between 120' and 2100' Palynological studies and visual kerogen analysis are based on 68 ditch samples taken between 120' and 14890' (TD). Vitrinite reflectance is based on 51 ditch samples taken at 300' intervals between 60' and 14870'. A plot of the low-gray Ro means (figure 1), kero§en analysis sheets (table I from palynological analysis, and table 2 from vitrinite analysis), a summary of the thermal maturity and hydrocarbon potential (table 3), and histogram plots are included with the report. Following is a summary of the biostratigraphy of the Pan American Napatuk Creek #1: 120' to 760': 760' to 920': 920' to 1240': 1240' to 1560': 1560' to 2040': 2040' to 5100': 5100' to 14890': P1 ei stocene P1 i ocene Early Pliocene Late Miocene/Early Pliocene Indeterminate Barremian to Turonian Indeterminate Detailed results and conclusions are as follows. 120' to 760'; Pleistocene: The diatoms Melosira sp., Actinoptychus senarius, Actinocyclus ehrenbergi~, Rhapho'n'eis surirella, Calon'eis sp Stauroneis sp. and · Par~'lia su.cata indica'te a pro'ba"61e' Pleistocene'age a'nd deposition in a coastal environment. Alaska Oil & Gas -2- January 7, 1982 760' to 920'; Pl iocene: The top of this interval is defined by the occurrence of the diatoms Paralia sulcata, Melosira granulata, Eunotia sp., Rhaphoneis sp. cf. R. fucus and Delphineis sp. This is a coastal assemblage of probable Pliocene age. 920' to 1240'; Early Pl iocene' The assemblage of diatoms occurring in this interval is comprised of Paralia sulcata, Coscinodiscus marginatus, Cosmiodiscus insi~nis, Thalassionema nitzschoides, Actinoptychus splendens, A. senarius, Rhaph'oneis su~i'rel'la, Acti.n. ocyclus sp. cf. A. ochotensi's, Thalassiosira usachevii, T. oestrup.ii, and Bacterosira.fra§ilis. This assemblage indicates an Early Pliocene age and deposition in a shallow, inner shelf environment. 1240' to 1560'; Late Miocene/Early Pl iocene: This interval contains the diatoms Cosmiodiscus insi~nis, Coscinodiscus marginatus, Thalassiosira sp. 1, Paralia sulcata, Actinopthchus senarius, and miscellaneous brackish forms indicating a Late Miocene/Early Pliocene age and deposition in an inner shelf environment. 1560' to 2040'; Indeterminate: Samples in this interval are barren of palynomorphs although the interval from 1720' to 1780' contains several species of diatoms indicating a marine environment. The interval from 1880' to 1940' contains several non-marine diatom species. Both of these diatom assemblages are indeterminate in age. 2040' to 5100'; Barremian to Turonian- The top of the Cretaceous is placed at 2040' because of the abundance of Cretaceous spore taxa encountered. The overlying Tertiary section was barren of palynomorphs except for several reworked Cretaceous spores. The spore assemblage encountered in this interval includes Aequitriradites spinulosus, Cicatricosisporites pseudotripartitus, Appendicisporites bilateralis, Concavissimisporites variverrucatus, Microreticulatisporites uniformis, Acanthotriletes varispinosus, Distaltriangulisplrites perplexu.s, and Rouseisporites reticulatus. longer ranging non-age diagnoStic forms are also prese~-~ Dinoflagellates are very rare and too poorly preserved to identify. Fungal palynomorphs are abundant throughout this interval suggesting a moist terrestrial environment. Those palynomorphs below 5000' are most probably cavings because their TAI values are in conflict with the higher maturity interpretations evidenced by the vitrinite reflectance measurements. Alaska Oil & Gas -3- January 7, 1982 5100' to 14890' (TD); Indeterminate: The samples below 5100' are barren of palynomorphs. Maturation Analysis Results from TAI analysis of the Pan American ~Napatuk Creek #1 indicate that the section penetrated between 120' and 2040' is transitionally mature, that the interval between 2040' and 6030' is slightly mature, and that the interval between 6030' and 14890' (TD) is moderately mature to mature. Since the 5000' to 5300' interval contains igneous lithologies, and because the vitrinite interpretations indicate overmaturity below this interval, those palynomorphs occurring below 5000' are probably cavings as their TAI values are in conflict with the vitrinite readings. Results from the palynological visual kerogen analysis of Pan American Napatuk Creek #1 are listed on the attached kerogen analysis sheet (table 1). Note that all of the samples analyzed from this well are dominated by cellulosic (gas type) kerogens. Results from fluorescence analysis of the palynology kerogen slides shows weak fluorescence from 5870' to 6250' (table 1). This zone of fluorescence is not present in the vitrinite kerogen slides (table 2), and is probably only a contaminant in the palynology kerogen slides. Results from vitrinite reflectance studies indicate that the section penetrated from 60' to 2130' is thermally immature; that the interval between 2130' and 2700' is transitionally mature; that the interval from 2700' to 5100' is mature, and that the interval from 5100' to 14870' (TD) is overmature. A slight increase in thermal maturity is observed at the Tertiary-Cretaceous unconformity (2040'). The break in the plot of the low-gray Ro readings (figure 1) at 5100' is due to lithologies of welded tuffs from 5000' to 5300'. A summary of the thermal maturity and hydrocarbon potential of the Pan American napatuk Creek #1 samples is included with the report (table 3). Histogram plots of the Ro readings from each sample, grouped into .05 class intervals, are attached. The reflectance measurements used in this study were made by R. R. Taylor. Time requirements for this job were charged to ESC Request No. 311A78. If you have any questions concerning our results or interpretations, please do not hesitate to contact us. · A. Ti mcke ~ _~' W. H. Abbott TAT/jg Attachments FIGURE 1 Plot of Low-Gray Ro Means Pan American Napatuk Creek #1 Bethel Basin, Alaska M-048 (5-78) suFF'ICIENT FOR TOO MILD INCREASING OIL SEVERE ENOUGH TO SEVERE ENOUGH TO FOR OIL GENERATION ,... CAUSE INCREASING CRACK HYDROCARBONS CRACKING OF TO METHANE GENERATION (/~ GEOCHEMICAL Z~ HYDROCARBONS z PARAMETERS n.- FAVORABLE 0.5 0.7 0.8 1.2 1.35 2.0 2.5 3.0% I000. 3000. 4000- DEPTH 6000. IN FEET 7000. 8OOO 9000- I0 I 1,000' 12,0OO ' 13~000 TABLE l'(Palynological Analysis) · ORGANIC RESIDUE (KEROGEN)ANALYS~$ ~-oo~ , , i i i, ,, SCALE' T : TRACE I<1%1 TYPE OF POLLEN COLOR, DEPOSITIONAL 1 : 1- lO% 6 : 51-6o% ORGANIC FLUOR. TAI AND PRESRV ENVIRONMENT 2 : 11- 20% ? : 61-70% 3 : 21 - 30% 8 : 71- 80% MATTER MATURATION 4 : 31-40% 9 : 81- 90% .... , , / - ' P R 0 J E C T: ~/~/~/~ . . ANALYST: ~ , ~. :~,0 'T ~ ~ ~ 5 '~ / i ' L/ / ?.D.'/O ~,;~. T ~ ~ -/ ~ 'T'T~ / / / / / Zz6~. - :&tap · - ~' g / c,~. i'h~? ~t') ,' '~'> q T T'~O '3 TABLE 1. (continued) ORGANIC RESIDUE (KEROGEN)ANALYSIS , {Rev,, 01-~OJ ,,., q i ~ i [ i SCALE' T : TRACE l<1%1 TYPE OF POLLEN COLOR, DEPOSITIONAL 1 : I- 10% 6 : 51- 60% ORGANIC FLUOR TAI AND PRESRV! ENVIRONMENT 2 : 11- 20% 7 = 61-70% ' 3 : 21 - 30% 8 : 7~ - ~o% MATTER MATURATION , ,~3~.~ .. ~ .~- ~0 ~ A N A L Y S T: ///,?d - /;~') 'Tl~'z~o / -/ ., i~:30~- ~&'O .~q,~:o // /~ ,. 1'7. O~/~ .- I ~0 'T '~ ~ ~ ~ ~ / / " ~ HID - - , ..... , .... TABLE 2,(Vitrinite Kerogen Analysis) ORGANIC RESIDUE (KEROGEN) ANALYSIS M-oos !,~,,, o!-~Ol SCALE' T : TRACE I<~%~ TYPE OF POLLEN COLOR, DEPOSITIONAL 1 : 1-10% 6 : St-60% ORGANIC FLUOR. TAI AND PRESRV ENVIRONMENT 2 : 11 - 20% 7 ; 61 - 70% 3 : 21 - 30% 8 : 71 - 80% MATTER MATURATION DATE: / ANALYST:' ~oo z~ o / / ,leo ~ i ~ ~ / /~ / l~eo q 3.~ o / / W~O ~ ~33 0 / / Sqoo ~z~ To / / .,, sWoo ~ 3 -~T 0 / / f~oeo ~1'~3 o [/ /i ~,~:,oo ~ ~ ~ 0 / / q~'O ~ ~ '~O 0 t ~ 0 :/ /~ , ~1 oeo ~ ~ qOt) q a q 0 ~' / IZooo 5 I ~ 0 ~) / ~ 7. Goo ~ 5 3 o / / r'3~O 4 Zq ~0 / / - ~q !oo ~ '5L 0 / / ~q 7oc 5t 7 ~o / / DEPTH OR SPL. NO. 60' 300' 600' 900' 1210' 1500' 1800' 2130' 2400' 2700' 3000' 3300' 3600' 3900' 4200' '4500' 4800' LOW-GRAY Ro MEAN m -- 0.38 O'60 0.60 0.78 0.79 0.83 0.90 0.94 0.89 0.92 0.93 0.95 0.92 % POP. 49 32 82 60 87 76 81 44 67 24 11 38 15 Pan Ro American FIRST HIGH-GRAY Ro MEAN 1.61 1.40 1.65 1.25 1.29 1.35 1.58 1.43 1.36 1.97 2.10 2.44 1.65 TABLE 3 Means, TAI, and Kerogen Napatuk Creek #1, Bethel Type Basin, % POP. TAI 42 63 14 36 11 20 17 39 32 76 89 61 67 2+,3- 2+,3- 2+,3- 2+,3- THERMAL MATURITY -- Immature Immature Immature Trans.mature Trans.mature Mature Mature Mature Mature Mature Mature Mature Ma tu re Alaska KEROGEN TYPE -- Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic HYDROCARBON POTENT I AL/REMARKS Barren of kerogen Barren of kerogen No In Situ vitrinitE No In Situ vitrinitE Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen TABLE 3 Ro Means, TAI, and Kerogen Pan American Napatuk Creek #1, Bethel Type Basin, Alaska DEPTH OR SPL. NO. 5100' 5400' 5730' 6000' 6300' 6600' 6910' 7200' 7510' 7800' 8100' 8400' 8700' 9000' 9300' 9600' 9900' LOW-GRAY Ro MEAN 2.25 1.95 1.86 1.44 1.48 1.49 1.66 1.66 1.63 1.71 1.80 1.86 1.93 1.93 1.88 1.99 2.06 % POP. 89 45 63 43 86 84 82 84 60 68 63 79 65 62 8O 69 68 FIRST HIGH-GRAY % Ro MEAN POP. 2.62 28 2.60 27 2.34 -23 2.05 8 1.90 5 2.43 16 2.21 6 2.21 30 2.10 22 2.12 16 2.18 9 2.30 20 2.33 29 2.32 7 2.46 16 2.47 25 TAI m 3 3- ,3+ THERMAL MATURITY Ovemature Overmature Ov e rrna tu re Overmature Overmature Overmature Overmature Overmature Overmature Overmature Overmatu re Overmature Ov e rma tu re Overmature Ov e rma tu re Overmature Overmature KEROGEN TYPE Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic HYDROCARBON POTENTIAL/REMARKS Igneous interval Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Pan Ro American TABLE 3 Means, TAI, and Kerogen Type Napatuk Creek #1, Bethel Basin, Alaska DEPTH OR SPL. NO. 10200' 10500' 10800' 11000' 11400' 11700' 12000' 12300' 12600' 12900' 13200' 13500' 13800' 14100' 14400' 14700' 14870' LOW-GRAY Ro MEAN 2.13 2.18 2.27 2.39 2.31 2.33 2.34 2.28 2.34 2.28 2.34 2.39 2.37 2.45 2.57 2.72 2.85 % POP. 74 40 46 52 60 63 84 65 57 66 57 48 45 36 28 28 62 FIRST HIGH-GRAY Ro MEAN 2.49 2.54 2.63 2.66 2.63 2.68 2.83 2.81 3.24 3.07 2.89 2.92 3.00 3.00 3.09 3.20 3.46 % THERMAL POP. TAI MATURITY 18 Ovemature 55 Overmature 39 Overmature 42 Overmature 30 Overmature 25 Overmature - Overmatu re 7 Overmature I Overmatu re 5 Overmature 10 Overmature 23 3+ Overmature 16 Ov e rma tu re 16 Ove rma ture 21 Overmature 30 Overmature 12 Overmature KEROGEN TYPE Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic Cellulosic HYDROCARBON POTENT I AL/REMARKS Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen Gas type kerogen , ... . , · . · · , , · .. · , 1" : --.... ( - .~ . ,.. O "· e- ,, · . ., OOO 0~$ 050 ~75 100 1~ 150 . . ~:~, ",~;~-/;<4i' .... .... -~;r' ' "~:. ..- ,.,. ,~ ~o .. :TI'. I'EV. = PCT.. 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