石油技術協会誌
Online ISSN : 1881-4131
Print ISSN : 0370-9868
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24 巻 , 2 号
選択された号の論文の6件中1~6を表示しています
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  • 生 越忠
    24 巻 (1959) 2 号 p. 29-38
    公開日: 2008/06/30
    ジャーナル フリー
    Defferent opinions concerning the geological age and correlation of the Cenozoic strata developed on the Bôsô and Miura Peninsulas, South Kantô, Japan, have hitherto been expres-sed by many Japanese geologists and paleontologists.
    The Cenozoic strata developed on the B ôs ô and Miura Peninsulas are divided lithologically into two groups, the lower, the Miura, and the upper, the Narita.
    In the present paper, the writer deals with some problems concerning the geological age and correlation of the Miura group.
    1) From the viewpoint of the Molluscan faunistic sequence, the Takoegawa sandstone and conglo-merate and Zusi mudstone on the Miura Peninsula may safely be correlated to the Mane mudstone, Motona sandstone and conglomerate, Siroiwa alternation and Kiyosumi sandstone on the B ôs ô Penin-sula, and the Kanazawa superformaton on the Miura Peninsula may be correlated to the Seki subgroup on the B ôs ô Peninsula.
    2) No incontrovertible direct paleontologic evidence is yet known, however, the approximate position of the Miocene-Pliocene boundary in the Bôsô and Miura Peninsulas can be determined by the biochronologic analysis of the Molluscan fossils collected from var;ous horizons in the Miura group.
    According to the recent opinion of K. HATAI, the Miocene-Pliocene boundary in the Bôsô Penin-sula corresponds with the so-called “Kurotaki unconformity” placed at the base of the Kurotaki formation and its correlatives. However, the writer is inclined to consider that this boundary in the Bôsô Peninsula is possibly placed below the Kiyosumi sandstone and its correlatives from which the so-called Dainiti-type Molluscans are collected. In the Miura Peninsula, the Takoegawa sand-stone and conglomerate and Zusi mudstone may be considered as ranging from the Upper Miocene up to the Lower Pliocene. Therefore, no major stratigraphic break is found near the transition stage from Miocene to Pliocene time throughout the B6s6 and Miura Peninsulas.
    3) The position of the Pliocene-Pleistocene boundary in the B ôs ô and Miura Peninsulas is currently one of the most controversial problems in Japanese Cenozoic stratigraphy.
    Although a great number of marine Molluscan fossils have been found in various horizons of the Pliocene and Pleistocene strata in the Bôsô and Miura Peninsulas, it is extremely difficult to determine where the Pliocene-Pleistocene boundary is, and opinions are still conflicting with one another on this problem.
    According to the writer's opinion, however, the Ôtadai alternation of sandstone and mudstone Umegase sandstone and alternation of sandstone and mudstone and their correlatives in the Bôsô Peninsula as well as the Kosiba tuffaceous sand in the Miura Peninsula may be considered to be Lower Pleistocene. The percentages of the living species of Molluscan fossils collected from these formations show tolerably high values.
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  • 藤井 清光
    24 巻 (1959) 2 号 p. 39-42
    公開日: 2008/06/30
    ジャーナル フリー
    石油の産出の減退曲線の分析結果を油田の開発に応用ずることにより次のような結論を得た。(1)連絨しお油層の産出減退曲線を片対数グラフに記ずと,油層の物理的性質が不均一であつても,各曲線は平行となる。これを潮用して油層の連続憧を知ることができる。(2)減退率は産出のみならず,油層の大きさの影懇をうける。(3) 油層の構造と減退の傾向との間にはある関係がある。(4)減退曲線の形は油層のエネルギーの影懇をうける。(5)油層が垂直方向に少し離れていくつか存在する場合には,減退曲線を分析することにより,各層を評価すろことができる。(6)2次回収の応用に対する油層の評価は,その油層に掘られたすべての井戸の減退曲線を分析ずろことにより得られる。
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  • 平川 誠一
    24 巻 (1959) 2 号 p. 43-47
    公開日: 2008/06/30
    ジャーナル フリー
    In this paper are discussed the evaluation of gas-in-place and production behaviors in natural gas reservoir of free gas type, and the properties of gas reservoir fluids such as gas converesion factor, solubility and water formation volume factor. These discussion are chiefly based upon the calculated results which were computed under pre-determined conditions, In these calcu-lation are involved the encroachment effect of water into the gas reservoir and the evolution effect of natural gas from liquid phase within the reservoir.
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  • 上床 国夫
    24 巻 (1959) 2 号 p. 48-54
    公開日: 2008/06/30
    ジャーナル フリー
  • 藤井 清光
    24 巻 (1959) 2 号 p. 55-62
    公開日: 2008/06/30
    ジャーナル フリー
  • 金原 均二訳
    24 巻 (1959) 2 号 p. 63-69
    公開日: 2008/06/30
    ジャーナル フリー
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