石油技術協会誌
Online ISSN : 1881-4131
Print ISSN : 0370-9868
ISSN-L : 0370-9868
55 巻, 1 号
選択された号の論文の10件中1~10を表示しています
  • 佐々木 詔雄
    1990 年 55 巻 1 号 p. 1-14
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
    Zeolites found in the Late Cenozoic marine sediments of the Japanese oil producing regions are widely distributed in a vertical zonal arrangement. The zeolitization in these sediments is studied at eleven deep wells drilled in the regions. The strata in these wells have been deposited continuously under the marine environments until the Recent.
    The zeolite and albite zones are present at the various depth, and are oblique to the stratigraphic datums. The subsurface temperature at the top of each zeolite zone ranges from 42°C to 60°C for the clinoptilolite zone, 64°C to 112°C for the analcime zone, and 124°C to 152°C for the albite zone.
    From consideration of burial and thermal histories in these wells, the transformation temperature of the alkali zeolite reaction series decreases gradually with increase in geological time elapsed since sedimentation, and/or with increase in the effective heating time of HOOD and CASTANO (1975). For exsample, clinoptilolite is transformed into analcime at 62°C for the effective heating time of 5Ma, and at 105°C for 0.5Ma, approximately.
    The zeolitization is governed by not only the maximum temperature but also by the geological reaction time under the marine enviroments saturated with the sufficient cations (Na+) in interstitial water.
  • 関口 嘉一
    1990 年 55 巻 1 号 p. 16-22
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
  • その地球化学と地質的背景
    重川 守, 近藤 和也, 早稲田 周
    1990 年 55 巻 1 号 p. 23-36
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
    Northern Ishikari area is one of the markedly distinguished areas for oil and gas fields in Hokkaido. Ishikari, Atsuta and Barato oil fields had been developed and the active exploration since 1983 resulted in the discovery of two gas fields such as Minamikanazawa and Minenobu gas fields.
    This area is divided into 3 tectonic provinces; The Western, Central and Eastern on the basis of its structural characteristics. The While the Western and the Eastern have clear NNE-SSW and N-S trending folds, the Central has undirectional dome structure and pre-neogene basement at shallower depth. The oil fields are situated in the Western and the gas fields in the Central. Oil and gas occur in the Neogene sandstone reservoirs of which the distribution is limited locally.
    The change of palaeobathymetry such as shallow in Ponsubetsu age, deep in Atsuta age and shallow in Bannosawa age is assumed on the basis of well and surface geological data and seismic record sections. In addition to this assumption, it is inferred that the area of oil fields was deeper than that of gas fields at least during the deposition of the formations of the above three ages.
    Source rock characteristics represent a good correlation to the palaeobathymetry. Carbon isotope ratio in kerogen, which reflects the type of organic matter, is particularly concerned with the palaeobathymetry.
    The source rocks in Barato SK-1 are characterized by more oil prone type than that in Minamikanazawa SK-1 on the basis of the data of S2/S3, carbon isotope ratio in kerogen and sterane composition. In Barato oil field, most part of kerogens in sediments are considered to be the source of oil accumulated, on the assumption that isotope ratio of kerogen is heavier than that of oil when oils and kerogens are genetically related.
    On the south of Minamikanazawa gas field, deep depression exist and the type of source rock deposited there is estimated to be oil prone. Nevertheless the hydrocarbon produced in Minamikanazawa gas field is only dry gas. This suggests that the hydrocarbons accumulated in Barato oil field and Minamikanazawa gas field are generated near the sturucture. One of reasons for these phenomena is thought to be due to the local distribution of sandstone reservoirs as pathways for generated hydrocarbon.
  • 平井 明夫, 佐藤 時幸, 高島 司
    1990 年 55 巻 1 号 p. 37-47
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
    The authors studied on the generation, migration and accumulation of oils in the Yabase Oil Field from the geochemical and geological view points.
    The Yabase oils reveal a wide range of gravity varying between 19°and 39°API. Heavier oils are considered to be biodegraded because they are relatively abundant in asphaltenes and relatively lack in gasoline range hydrocarbons and normal alkanes. All oils containing a relatively high quantities of alkanes are considered as paraffinic oils except for biodegraded oils. They have similar alkane distributions ranging from n-C10 to n-C35 with fair quantities of n-alkanes above n-C25 and pristane/phytane ratios below 2. It indicates that the oils have been generated from a similar source including predominantly sapropelic material deposited in an anoxic environment at low to middle maturity. On the basis of gas chromatography/mass spectrometry (GC/MS) analysis, the oils have very similar sterane and triterpane compositions. It suggests that they have been generated from very similar marine source at low to middle maturity. Carbon isotope data confirm the conclusions from GC/MS analysis.
    Effective oil source rocks are probably argillaceous rocks of the Onnagawa and the Nishikurosawa formations at depths greater than 2, 000m in this area. The Yabase oils have not generated from the Funakawa and the Onnagawa formations around the reservoirs, because they are at immature stage.
    Correlation between oils and several candidates of source rocks indicates that the Yabase oils have been derived from the argillacecous rocks of the Onnagawa and the Nishikurosawa formations placed in early to middle mature zone.
    These source rocks have entered the oil window in the latest Pliocene (Sasaoka age). Most of the oils have migrated and accumlated in the Quaternary to Recent.
  • 坂田 将, 金子 信行, 鈴木 徳行
    1990 年 55 巻 1 号 p. 48-53
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
    Crude oils and condensates from two sedimentary basins in Northeast Japan were analyzed for steroid and triterpenoid hydrocarbon biomarkers. Based on the biomarker parameters, the following conclusions were drawn concerning their maturities and sources:
    (1) The condensates are distinctly more mature than the crude oils. Some crude oils from the Akita-Yamagata basin are more immature than any of the oils from the Niigata basin. The stage of primary migration of petroleum in the former basin was possibly earlier than in the latter.
    (2) The source material for the oils from the Niigata basin is more terrigenous than that for the oils from the Akita-Yamagata basin. No systematic difference exists between the source material for the oils and that for the condensates from the Niigata basin.
  • 伊藤 雄一, 田口 徹二
    1990 年 55 巻 1 号 p. 54-65
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
    Mahakam delta, located in Tertiary Kutei basin, is one of the most prolific oil and gas producing area in Indonesia. Many oil and gas fields have been discovered and developed in this area so far.
    Sediments in Mahakam delta is composed of Middle Miocene to recent deltaic sediments. Maximum thickness of these deltaic sediments so far drilled is ca. 4, 500m in the central part of the present day Mahakam delta.
    Oil and gas fields are located on NNE-SSW trending anticlinal trends formed by Late Miocene to Pliocene compression. Main reservoirs are deltaic sands of Middle to Upper Miocene. Both oil and gas fields are located on same anticlinal trends. On BADAK-HANDIL and ATTAKA-BEKAPAI anticlinal trends, anticlines forming oil fields are always associated with large scale normal faults whereas anticlines forming gas fields are not.
    Coals, lignites and shales in Middle to Late Miocene deltaic sediments are recognized as potential oil source rocks in this area. These sediments have high TOC and high hydrocarbon potential yield values with kerogens being type III.
    Studies on extracted hydrocarbons (C1-C35) from source rocks at HANDIL oil field suggests that HANDIL oil must have been generated from these Miocene source rocks. Tmax value of 435°C (R0 0.6% equivalent) corresponds to top of oil window and Tmax of more than 445°C (R0 of more than 0.75% equivalent) corresponds to peak oil generation at HANDIL field.
    Based on various geological and geochmical aspects, it is possible to say that BEKAPAI oil might also have been generated from the same source rocks as HANDIL oil.
    Primary migration pathways are not yet well defined in Mahakam delta. However, as oil accumulations are associated with large scale normal faults and gas accumulations are not, these faults may have acted as important oil migration pathways.
    Future geochemical studies in Mahakam delta shall be directed to solve the questions on the origin of oils in different fields, primary migration pathways as well as effects of high pressure zones, commonly recognized in the area, on migration mechanisms.
  • 上西 敏郎, 稲場 土誌典, 田中 隆, 谷口 正靖
    1990 年 55 巻 1 号 p. 66-75
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
    Oil fields in the offshore Zaire area are located along the central Atlantic coast of Africa within the so-called Salt Basin. These oil fields have been producing approximately 20, 000 BOPD since 1975. All except the LUKAMI field produce crude oil from the Pinda Formation (post-salt), but the LUKAMI only produces oil from the Lucula Formation (pre-salt).
    Source-rock evaluation of cuttings samples was carried out by means of organic-carbon analysis, Rock-Eval pyrolysis, and vitrinite-reflectance measurement. Oil-source correlations between the produced oils and the cuttings extracts from a LUKAMI well were attempted on the basis of distributions of steranes and triterpanes. Mudstones in the pre-salt sequence, mainly in the organic-rich Bucomazi Formation, have excellent source-rock potential, and their extracts have biomarker patterns similar to those of all the oils. Mudstones in the post-salt sequence, however, have poor potential and different biomarker patterns from those of the oils.
    As a result, the produced oils are considered to be derived mainly from the pre-salt sequence (Bucomazi Formation), and not from the post-salt sequence (Pinda Formation).
  • 要旨
    平井 真, 林田 進男
    1990 年 55 巻 1 号 p. 76-77
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
  • 1990 年 55 巻 1 号 p. 78-84
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
  • 特に琉球列島およびマリアナ諸島を例として
    茅根 創
    1990 年 55 巻 1 号 p. 85-86
    発行日: 1990年
    公開日: 2008/03/27
    ジャーナル フリー
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