新疆石油地质 ›› 2011, Vol. 32 ›› Issue (6): 597-599.

• 油气勘探 • 上一篇    下一篇

三湖坳陷第四系地层水在生物气运聚中的作用

程付启1a, 林会喜1b,2   

  1. 1.中国石化胜利油田有限责任公司a.地质科学研究院;b.西部新区研究中心,山东东营 257015;
    2.中国矿业大学博士后流动站,北京 100083
  • 收稿日期:2011-02-13 出版日期:2011-12-01 发布日期:2020-08-20
  • 作者简介:程付启(1978-),男,河南杞县人,高级工程师,博士,石油地质,(Tel)13561056211(E-mail)chengfq9804@yahoo.com.cn.
  • 基金资助:
    中国博士后科学基金(20090451345)和国家专项(2008ZX05006)

Effect of Quaternary Formation Water in Sanhu Depression on Biogas Migration and Accumulation

CHENG Fu-qi1a, LIN Hui-xi1b,2   

  1. 1. Shengli Oilfield Company Ltd., Sinopec, a. Research Institute of Geological Sciences, b. Research Center of Western New Areas, Dongying, Shandong 257015, China;
    2. Post-Doctoral Work Station, China University of Mining and Technology, Beijing 100083, China
  • Received:2011-02-13 Online:2011-12-01 Published:2020-08-20

摘要: 为了揭示三湖坳陷第四系地层水在生物气运移、聚集中的作用,分析了地层水动力学、水化学特征,并通过生物气运移方式及聚集特征分析,明确了地层水对生物气运聚的控制作用。研究发现,三湖坳陷地层水水势南高北低,使溶解态运移的生物气从南向北运移,并在北部斜坡带富集。横向上,地层水矿化度总体边缘低、中部高,在此背景下发育3 个高值区,这些矿化度高值区是生物气析出成藏的有利位置,如台南和涩北气田的形成;纵向上,地层水矿化度总体向下升高并存在多个“增高-降低”旋回,从而使生物气在高矿化度段析出、低矿化度段溶解,形成多组合叠置的气藏,且矿化度旋回变化幅度与生物气富集程度成正比。

关键词: 柴达木盆地, 三湖坳陷, 第四纪, 地层水, 生物气运聚

Abstract: The kinetics and geochemistry characteristics of formation water in Sanhu area are investigated in order to reveal the effect of Quaternary formation water in Sanhu depression on biogas migration and accumulation, and the effect of formation water on biogas migration and accumulation is determined clearly by the features of biogas migration and accumulation. The study shows that the potential energy of the formation water in Sanhu depression in south is greater than that in north. Laterally, the salinity of formation water is lower in depression margin than in center, and 3 high-salinity districts appear. These high-salinity districts should be the favorable places for biogas precipitation and accumulation, for instance, the formation of Tainan and Sebei gas fields. Vertically, the salinity of formation water is increasing from the top down, with up and down multi-cycle variation. Such a "south-high and north-low" potential energy of formation water allows the biogas dissolved in water to migrate from the south to the north and accumulate toward slope zone in the north. And the multi-cycle variation results in the biogas precipitation at high-salinity section and dissolution at low-salinity segment, shaping multi-group superposed gas reservoirs. Also, the amplitude of multi-cycle variation of the formation water salinity is proportional to the biogas enriched extent.

Key words: Qaidam basin, Sanhu depression, Quaternary, formation water, biogas immigration and accumulation

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