The values of the total amount of C10-C33, C21-C33/C10, C10-C20, CPI, and C10-C33/Corg.** of n-paraffin in terrestrial plant, forest soil, peat, lake and marine sediments were estimated, and then were discussed with regard to the relationship to their original materials. 1) The total amount of C10-C33 comes up to the high range from 6.2 to 1905 in plant and peat, and 1.1 to 20.4 in soil and lake sediments respectively. On the other hand, that of marine sediments ranges from 0.2 to 3.2 and it is lower than that of terrigenous sediments in general. 2) The ratio of C21-C33/C10-C20 ranges from 3.8 to 1085 in plant and peat, and 2.2 to 47.0 in lake sediments respectively and it is largely more than 4.0. On the other hand, marine sediments have the values ranging from 0.3 to 8.1 and about fifty percent of samples have the values less than 1.0. 3) The values of CPI ranges from 2.0 to 3.2 in plant, soil, and peat, and 2.2 to 3.9 in lake sediments respectively, while the values of marine sediments ranges from 0.7 to 4.8 and fifty percent of samples have the values less than 2.0. 4) The ratio of C10-C33/Corg.(×104) ranges from 0.9 to 5.8 in lake sediments and the majority of the samples have the values more than 3.0. On the other hand, the ratios in marine sediments ranges from 0.2 to 4.1 and the most frequent range is from 1.0 to 1.5. 5) The vertical distribution of the values of C21-C33/C10-C20, CPI, C10-C33/Corg.[and] total amount of C10-C33 in peat bog, lake and marine sediments (Quaternary in age) are observed to be controlled by the original organic material.
About 10 years ago, two wells were drilled in northern Hokkaido: MITI Wakkanai well in 1971 and Masuporo SK-1D well in 1973. The informations gotten from these wells strikingly changed the common idea on the stratigraphy of this region by that time. That is, thick Paleogene sediments composed of coal-bearing formation in lower part and argillaceous formation with marine fauna in upper part were encountered in these wells. These were correlated to the Ishikari and Poronai groups respectively based on lithology and fossil evidences. As these Paleogene sediments had not been found on the surface of this region, it had been considered by that time that Paleogene does not exist in this region. However, it is regrettable that the detailed informations of the Paleogene have not been published. Recently the Tertiary in Hokkaido has been studied from many points of view and many different opinions have been proposed mainly based on microfossil evidences. It may be necessary to reexamine the Tertiary. In such a situation the above-noted unpublished informations gotten from the wells become very significant. This is just the reason that the author dares to report this paper now. The author fortunately had a chance to carry out the palynological analytical research on the abovenoted two wells. The results of the research are reported in the present paper, mainly on the Paleogene. The Paleogene is divided into two parts: an upper marine part and a lower shallow marine to non-marine coal-bearing. They are correlated to the Poronai and Ishikari groups respectively also based on the result of pollen analysis. Especially, a pollen floral sequence found in the Paleogene in the Masuporo well is valuable for the Tertiary climatic history as a typical climatic change at the end of the Paleogene time well represented. Sediments called the Magaribuchi or Kiyohama Formation are distributed on the surface in the area for the present study. In 1970 the author reported that the sediments are correlated to the Momi jiyama Formation in the Ishikari region, Paleogene. The sediments are also correlated to the upper part of the Paleogene found in the wells after the result of pollen analysis.
Two kinds of "breccias" can be distinguished on the basis of the foraminiferal fossil content and the lithology in the Shiiya and Nishiyama Formations. The distribution area of the "breccias" and the dominant kind of them shift with the lapse of time. "Disturbed" deposits, which can be discerned by using CLUSTER, are mostly associated with occurrence of "breccias". Characteristics of them indicate that a part of them corresponds to olistostromes. The direction of the paleoslope inferred from dips in the "disturbed" deposits is harmony with the decreasing direction of the sand content and the thickness of "breccias".
In our previous paper (TEZUKA et al., 1980), we proposed characterization of crude oils by the infrared (IR) method combind with proton nuclear magnetic resonance (1HNMR). In this paper, we attempted to adopt the method in order to identify the crude oils, to judge the dissimilarity between the two crude oils, and to make a comparison of oil with its producing zone. IR and NMR spectra of known crude oil samples and unknown were measured, and log I0/I at 1600cm-1 of the IR, CH2/CH3 of the NMR spectra were plotted on the two dimentional diagram, respectively. If these plots were within tolerance limit of the error, two crude oils should be concluded as the same. We took Niibori-3W and 6W crude oils in the Shounai Oil-field, and Asahihara-1 and Koshijihara-2 crude oils in the Minaminagaoka Gas-field to examine whether the crudes were as the same or not. As their plots did not coincide in both cases, they were not estimated as the same. The conclusion agreed with that from the conventional method, such as comparison of distillation curves, specific gravity, etc. Sampling of crude oils was made twice from 12 wells in Abudhabi Oil-field in 20 months' interval. These 12 pairs of Abudhabi crudes were examined by the method. In some wells, IR and NMR specific values of the newer and the older samples were different, but in other wells both values agreed. So far as in the latter wells, it could be said that they were producing crude oils of the same nature at least for 20 months, and the nature of produced oils were kept unchanged in atmospheric condition during the period. The crude oils from such a field as the Yabase whose producing zones are in piles vertically, have a tendency that their aromatics contents are changed unilaterally with the increase of depth. By the use of IR specific values and above the relationship, samples whose sources were unknown, were found to be attributed to the producing zones. This is a rapid and simple and useful method as mentioned above. In addition, many practical uses should be applicable especially when it is not enough for research both in time and in sample amounts.