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Home My WebLink AboutGMC Data Report No. 172Vitrinite reflectance data of cuttings (800' - 12610') from the Texaco Inc. East Kurupa Unit No. 1 well. See GMC Data Report No. 122. Received 27 September 1990 Total of 14 pages in report · · Alaska Geologic Materials Center Data Report No. 172 0 [:::, c~c~c~c '16- 12' 0 0 '1 C 0 5'1 1 '.2 - 't r. ~, lI bi) I 0 0 0 '1 61 0 O. I >,, I ! -t 'e"c'-" n, Z' J : i · · · · · 'il.I i · Z 0 0 E, K u I" H [::, cl I...I f-ii t:... I , 5 5 S D: O, 1 0 ,.:,.:,.:,.:,.: 16- D e 1'- C:: ® n t-... ~ m ¥ z 6'1 I 0 I N 0 O. I 10- ¥ Z © 61 rooo o I c) L-- d E; '1 0 I r ... t._. ':'J r 1 i f I 1 ~ Fr-I Z Z I N 0 Q. I >. E r i I i r ~ r-r'l CL 16- n ~ 16- 4- !._-.I -t .,-, ,2, Cs, I.i~i I~'l"ll i.,/I .~1 d El '] I f -~ . r IIi .... J i i ' iiiii , i ................. il I 'Irllll II I I ......... ....... . ''~ _ " ' ,. , ~ " 61 :~: 0 I 0 I >. 4 0 ¥ United States Department of the Interior OEOLOOICAL SURVEY BOX 25046 M.S. DENVER FEDERAL CENTER DENVER. COLORADO 80225 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 all 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. My 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 histogram will have some kind of a bell curve shape. Gaps in the histogram, relating to multiple 'populations "~f' organics, are a problem and 'dilute the strength of the mean value asa 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 were 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 know. Thank you for providing the samples, and for your assisstance while I was visiting. GMC Data Report No. 172 Page 14/14 .'.#210-A ..-