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Home My WebLink AboutGMC Data Report No. 167Vitrinite reflectance data of cuttings (6160' - 11030') from the Arco Alaska Inc. W. Mikkelsen Unit No. 2 Well. Received 27 September 1990 o- Total of 11 pages in report -. Alaska Geologic Materials Center Data Report No. 167 0 13. I I~i 0 13. I 18- 1 '."2. - ! r' ~000 0~ c; "'9. - -- =l-- I .~.l '"J Ii,._.lI i I J i I I '1 I F! ~ F' C: ® F'I f.. F,'. r]'-i Z r~0o o 16- Ill,.,~I ! I 1 J -i 'l I I 1 I o ~oo o 0 '~ J o. I 00--0 0 0 --,-- 0 0 I ..~ 18- I-I P e F ,:il:: ® ri t.. ;, , ', ,.. ., ,,,, , t~ Z 0 I I T I 0 d 0 Cl. I 1 ¥ 0 0 I N 2 , C,] O 12- ',-' O. 0 0 Om,, 0 I N 0 I ,-' C~--- 0 0 ~ I I I I I t c~ J o 0 o. I N 0 I i I I T I I ! I o o o ~o0o 0 '' ! 0 I 16- 1 'Z - F,?. r"r-i IN II[I~I.Y II~..l,'~.n United States Department of the Interior GEOLOGICAL SURVEY BOX 25046 M.S. r-ZlqO DENVER FEDERAL CENTER DENVER, COLORADO 80225 I I 17 September, 1990 John Reeder P.O. Box 772116 Eagle River, AK 99577-2116 · John: I am returning the prepared samples I borrowed from the state back in January. Enclosed, also, you will find data and histogram sheets for almost ail the samples. Some samples did have organic material I deemed good enough to measure. For the most part, the samples were good and the results are evident, at least individually. Taken on a well-by-well basis several were difficult to make good sense out of from an organic petrology point of view. The shape of the histograms is a good general indicator of consistency of the organics contained within and in the confidence I had while examining the samples. ~iy technique was to measure, at.least 50 organic grains, while, trying to stay within a_narrow range'. This becomes difficult with increased vitrinite reflectance, and the histogram spread-increases. With adequate material and consistent rank (contamination from uphole carings can. introduce diverse groups of organics) the histogra~ ~ill have some kind of a bell curve shape. Gaps in the histogram, relating, to multiple :populations 'of 'organics~-are a*-problem and 'dilute the strength of the mean value as a good measure of the thermal maturity. These gaps are more common at the higher ranks, (> 1.5~ reflectance), but occur at lower ranks when insufficient material exists or there is contamination in the sample. I admit to certain biases against samples prepared by people other than myself, and these samples ~ere made by several different companies. I feel I lose too much control over the processing of the cuttings and do not have the confidence in other people's dedication to the work. I hope these data can be of some use to you. If I can help by providing - additional information, please let me kno~. Thank you for providing the samples, and for Four assisstance while I was - ~ visiting. :-\ GMC Data Report No. 167 - .Page 11/11 ~ i".. .... : ' '""' ' ' '"': :" ' ~.. :'::'::": ..... "'" 'i ; i -: .. :: :':-- :'- ' ...... ,. ~' , '"- - , · . . :. .. .......:. ..,- : - : ._:.-_*.--~