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51 巻 , 3 号
選択された号の論文の7件中1~7を表示しています
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  • 山路 敦
    51 巻 (1986) 3 号 p. 197-204
    公開日: 2008/03/27
    ジャーナル フリー
    有機熟成は1次反応と考えられており, これにより反応速度式が導かれる。従来は, この式を差分法で解くことにとって熟成度の予測が行われていた。しかし差分法は一般に方程式系の構造について良い見通しを与えるとはいえない。この点については反応速度式を直接に積分する方法が優れている。埋没史•熱史が時間の簡単な関数に帰着できる場合には, 積分を解析的に解くことができることがその理由である。
    本論文では, 4通りの基本的なテクトニック•モデルについてビトリナイト反射率と埋没深度との関係を解析する。
    このモデル計算の結果のうち重要なものを述べる。従来, ビトリナイト反射率の対数と深度は直線関係を示すことが強調されて来た。しかしこの関係は造構運動の終息した古い堆積積盆でしか成立しないことが明らかになった。
    温度と時間の熟成度への影響を調べるにあたり, 従来は中生代あるいは第三紀の古地温を推定せざるを得なかった。しかし直接積分法は現在も堆積が続行している地域に適用可能であるから, 第四系•上部第三系のデータをこの方法で処理することにより, 温度•時間•熟成度関係を調べることができる。堆積盆ごとにこの関係を解析することも原理的には可能である。
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  • 佐藤 時幸
    51 巻 (1986) 3 号 p. 205-208
    公開日: 2008/03/27
    ジャーナル フリー
  • 榎本 兵治, 洪 承燮, 田中 正三, 幾世橋 広
    51 巻 (1986) 3 号 p. 209-217
    公開日: 2008/03/27
    ジャーナル フリー
    Because of the high interfacial tension between water and oil, the injection pressure of water in water flooding is fairly high and the subsequent oil displacement efficiency is rather low. Then the improvement was aimed for the reduction of injection pressure and the efficient displacement by adding a small amount of surfactant into the injection water. Surfactants used were Polyoxyethylenenonylphenylether HLB=17.1 and 12.6 as nonionic, and SDBS as anionic. These were separately used as water solutions of 300ppm in concentration without any additives like alcohols as co-surfactants.
    Results are summarized as follows.
    (1) Adding a surfactant into the injection water can reduce the injection pressure surprisingly even if the concentration of the surfactant is as low as 300ppm, which is 1/50 to 1/100 of that in the low concentration surfactant flooding. Results were correlated with the capillary number as shown in Fig. 10.
    (2) 300ppm surfactant-water solution was able to increase the oil recovery. This may be caused by the snap-off mechanism proposed by ARRIOLA et al.
    (3) krw/kro decreases with decreasing the interfacial tension, that is to say, the oil gets to flow easily compared to the water as the interfacial tension decreases. This effect was related to the shift of residual oil saturation with the interfacial tension.
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  • 佐々木 詔雄
    51 巻 (1986) 3 号 p. 218-227
    公開日: 2008/03/27
    ジャーナル フリー
    In this paper, the distribution of carbon dioxide in natural gases recovered from the Platong gas field and its origin are discussed on the basis of geological evidences.
    Carbon dioxide content in gases of this field is average 15% and partly more than 40%.
    Gas bearing Tertiary sediments are dominated by gas-prone woody-coaly organic matters. Main east-dipping faults in the western flank of this structure cut basement complex. Gas reservoirs containing rich carbon dioxide, more than 40%, are locally distributed in the northwestern part of this field. The spatial spread is clearly oblique to stratigraphic markers and is like “conical mass”. This mass is characterized by high density shale more than 2.70gm/cc and very low Cl- content in formation water.
    The above marked features suggest that carbon dioxide has been generated from woody-coaly kerogen in sediments during thermal diagenesis, and also has been supplied from “magmatic origin” through the faults, and/or formed by oxidation of hydrocarbons through contact with mineralized waters, which have ascended into Tertiary sediments along fractures and fault zones.
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  • 坂田 将, 高橋 誠, 星野 一男
    51 巻 (1986) 3 号 p. 228-237
    公開日: 2008/03/27
    ジャーナル フリー
    Chemical and isotopic analyses were applied to characterize genesis of natural gases commercially produced in north-east Japan, so called “Green Tuff” region. Concentrations of He and N2, isotopic ratios of 3He/4He and 4He/20Ne, δ13C values of CH4 showed positive correlations with stratigraphy of gas reservoirs. Especially isotopic values of He included in the deepest gases from volcaniclastic rocks in Nanatani and Nishikurosawa Formations were almost equivalent to those of volcanic fumaroles in the Japanese Islands, suggesting high contribution of mantle materials.
    On the other hand the genetic diagram of hydrocarbon compositions versus δ13C values of methane attributed hydrocarbon compounds exactly to pyrolysis products of organic matters in sedimentary rocks regardless of their reservoir rock types.
    No more than 1% of methane seems to be derived from upper mantle, whose contribution may be estimated by comparing CH4/3He values of Green Tuff gases with those of hydrothermal fluids according to studies of EPR.
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  • 秋林 智, 軽部 幸一, 原 淳治
    51 巻 (1986) 3 号 p. 238-244
    公開日: 2008/03/27
    ジャーナル フリー
    The spatial distribution of transmissivity in the water-dissolved gas field (G6 formation) in the Nishikanbara district, Niigata prefecture, was estimated using time histories of the groundwater heads which were calculated from the production data such as flow rate, gas-water ratio and wellhead pressure etc. at a number of wells. A quasi-linear approach was used to estimate the transmissivity.
    The estimated values of transmissivity were in the region of 2.0×10-4-7.8×10-2m2/s, and in the same accuracy as the values of transmissivity which were estimated using time histries of the groundwater heads including the errors which were expressed by random numbers of normal distribution N (0, 4.92).
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  • 矢津 修示
    51 巻 (1986) 3 号 p. 245-255
    公開日: 2008/03/27
    ジャーナル フリー
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