秋田・山形地域油・ガス田の地層水の地球化学  [in Japanese] Geochemistry of formation waters from oil and gas fields in Akita and Yamagata Prefectures, northeastern Japan  [in Japanese]

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Abstract

Geochemical studies on formation waters collected from oil and gas fields in Akita and Yamagata Prefectures, northeastern Japan, were carried out in order to clarify chemical characteristics, origin and alteration processes of them.<br>The formation waters are chemically characterized by depleted Cl<sup>-</sup>, SO<sub>4</sub><sup>2-</sup> and Mg<sup>2+</sup>, and enriched HCO<sub>3</sub><sup>-</sup> I<sup>-</sup>, HBO<sub>3</sub><sup>2-</sup> and NH<sub>4</sub><sup>+</sup> compared with the sea water.<br>They have a relatively narrow range of δD values between -10 and +1‰ and a large variation of δ<sup>18</sup>O values from -3.6 to +2.5‰, which are similar to formation waters in Niigata.<br>The measured Sr<sup>2+</sup> contents of them range from 4.1 to 51.8 mg/l. The formation waters have Sr isotopic values ranging from 0.70622 to 0.70764, which are less than those of the sea waters from Miocene.<br>These chemical and isotopic data show that the formation waters were originated from the sea water entrapped during deposition and subsequently altered due to the interaction with rocks, organic matters and so on.

Journal

  • Journal of the Japanese Association for Petroleum Technology

    Journal of the Japanese Association for Petroleum Technology 65(3), 229-237, 2000-05-01

    The Japanese Association for Petroleum Technology

References:  37

Cited by:  5

Codes

  • NII Article ID (NAID)
    10008852491
  • NII NACSIS-CAT ID (NCID)
    AN00130976
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03709868
  • NDL Article ID
    5392412
  • NDL Source Classification
    ZP29(科学技術--化学・化学工業--燃料--石油)
  • NDL Call No.
    Z17-178
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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