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Volume 47 (1982)
- Issue 6 Pages 367-
- Issue 5 Pages 267-
- Issue 4 Pages 207-
- Issue 3 Pages 151-
- Issue 2 Pages 77-
- Issue 1 Pages 1-
Volume 47, Issue 3
Displaying 1-5 of 5 articles from this issue
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Kanji KATO, Kunio NAGAHAMA, Mitsuo HIRATA1982 Volume 47 Issue 3 Pages 151-157
Published: 1982
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSGeneralized interaction parameters for the Peng-Robinson equation of state were applied to the multicomponent system which contains CO2 and normal paraffins. The Minimum Variable Newton Raphson method was employed for the bubble point pressure calculation. The effective estimation of the initial values for it was presented. As results of prediction, good correspondence was observed for the bubble point pressure but rather poor result was observed for the density, which could be inherent in the Peng-Robinson equation. The convergence property was also studied and it showed that both the Minimum Variable Newton-Raphson method and the initial value estimation method were quite efficient.View full abstractDownload PDF (623K) -
Akio SASAKI, Nobuyoshi FUJIOKA, Kazuo HUZIOKA1982 Volume 47 Issue 3 Pages 158-167
Published: 1982
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSThe authigenic minerals in sedimentary rocks commonly consist of zeolites, silica minerals and clay minerals as shown in Fig. 2. These minerals are mainly formed by burial diagenesis. The reaction temperatures to form these minerals are particularly affected by physical factors; heating time and geothermal gradient. The transformation of the authigenic minerals is similar to the progress of maturation of organic matters in sediments.
From this study, the variations of the authigenic mineral zones in the Cretaceous and Tertiary sediments of Hokkaido, Akita and Niigata oil fields are correlative with the various parameters for determining maturation levels in organic matter. The parameters include vitrinite reflectance, elemental analysis and colouration of kerogen, the ratio of extractable hydrocarbon to organic carbon and carbon preference index. For example, the first occurrences of clinoptilolite, analcime, albite and montmorillonite-illite mixed layer mineral are 0.35, 0.53, 0.68 and 0.50% in vitrinite reflectance, respectively.
The "oil generation zone", which corresponds to vitrinite reflectance of 0.5 to 1.3% and is defined by a large ratio of extractable hydrocarbon to organic carbon, approximately belongs to the analcime zone to the albite zone or the mixed layer mineral zone to the illite zone. The maximum of the "oil generation zone" is distributed in the albite zone and/or the illite zone.
The authigenic minerals are considered to be an important parameter to indicate the maturation levels of organic matter in sediments.View full abstractDownload PDF (1182K) -
Osamu FUKUTA, Matsuzo NAGATA1982 Volume 47 Issue 3 Pages 168-185
Published: 1982
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSAll of the iodine produced in the world, excluding that from "caliche" in Chile and sea weed, is collected from subsurface brines. The iodine in subsurface brines may be classified into the following two types; one of them is the iodine dissolved in brines accompanied by dry gas, and the other is gaseous brine occurring in the oil field region. The former is represented by iodine in Japan, which occurs in brine directly derived from sea water probably. The iodine content of this type brine is 143.5mg/l in maximum. A typical one of the latter type is iodine produced in Oklahoma, U.S.A. The iodine-bearing brines occur in the upper Paleozoic formations. The brines are characterized by their outstandingly high iodine contents.View full abstractDownload PDF (1782K) -
Yoshiki KIKUCHI1982 Volume 47 Issue 3 Pages 186-194
Published: 1982
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSThe evolution of Tethys had been the result of activity of plates between Europe and Africa. The Tethys and concurrent alpine orogeny were the big events in Mesozoie history. Petroleum explorationists have experiences and knowledges of the prolific ocean for generation of oil since long ago. The stratigraphy and depositional environment of source rock in lower Cretaceous was proven by DSDP in the present ocean.
In this report, the writer would like to describe petroleum geology in the main oil belt from Lybia to Iran-Iraq via Turkey where lower Cretaceous is main producing horizon and also heavy oil is derived through migration from basinal to marginal structures with connate water.
The Syrian arch from north Egypt toward north-east direction is probably paralel with shore of Tethys.In relation with Sarir field in Lybia, the extensive exploration work in the Levant basin will bring us a clue to lower Cretaceous oil by the Tethys.View full abstractDownload PDF (1034K) -
Takashi MIKI1982 Volume 47 Issue 3 Pages 195-196
Published: 1982
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSHeavy mineral assemblages of sandstones of the Miocene Yaeyama Group were examined using core samples from a borehole of MITI Miyakojima-Oki drilled at the sea floor off Miyako-jima, Ryukyu Islands.
Identified heavy mineral species are garnet, zircon, tourmaline, amphibole, epidote, rutile, pyroxene, glauconite, chlorite, monazite, staurolite and anatase, and among them, garnet appears in highest frequency in all specimens. Characteristic mineral as staurolite is found in many samples inspite of its low frequency. These minerals are presumed to have been supplied from the source area consisting of granitic rocks and metamorphic ones. Such assemblages resemble to those of the same group and its equivalents distributed in small islands such as Iriomote-jima, Yonaguni-jima and also in Formosa. This fact may suggest a paleogeographical relevancy between a source land near Miyako-jima and that adjacent eastward to Formosa which were named as the East China Old Land (LIEW and LIN, 1974).View full abstractDownload PDF (231K)
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