石油学报 ›› 2009, Vol. 30 ›› Issue (6): 809-815.DOI: 10.7623/syxb200906004

• 地质勘探 • 上一篇    下一篇

柴达木盆地三湖地区第四系生物气运聚成藏的定量研究

李明诚1, 李剑2, 张凤敏2, 张英2   

  1. 1. 中国地质大学能源学院, 北京, 100083;
    2. 中国石油勘探开发研究院廊坊分院, 河北廊坊, 065007
  • 收稿日期:2009-07-10 出版日期:2009-11-25 发布日期:2009-05-25
  • 作者简介:李明诚,男,1935年1月生,1956年毕业于北京地质学院,现为中国地质大学教授,长期从事石油地质和油气运移研究.

Quantitative research on biogas migration-accumulation and pool-forming in the Quaternary of Sanhu area in Qaidam Basin

LI Mingcheng1, LI Jian2, ZHANG Fengmin2, ZHANG Ying2   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. Langfang Branch, PetroChina Exploration and Development Research Institute, Langfang 065007, China
  • Received:2009-07-10 Online:2009-11-25 Published:2009-05-25

摘要:

三湖地区第四系生物气在地下运聚的相态以游离气为主,约占生气量的70%以上,为该区直接形成游离相生物气藏提供了物质基础。生物气在地下的聚集成藏主要受控于同生圈闭,因此只有在下更新统K1同生背斜定型(距今1.35Ma)后排出和析出的游离气量才是可供聚集的有效排气量。压实水动力和浮力是游离气垂向运聚成藏的直接动力,可提供9.72×108m3/km2的有效气量;下渗水动力是含气水流侧向运移的动力,可提供1.08×108m3/km2的有效气量。根据运聚动力、运聚数量和聚集样式的分析,三湖地区第四系生物气可概括为"自生自储、以近源垂向运聚为主、受同生圈闭控制"的成藏模式。在此基础上预测该区第四系生物气的地质资源量为11210×108m3,三级储量为5604×108m3

关键词: 柴达木盆地, 三湖地区, 第四系, 游离相生物气, 同生圈闭, 有效排气量, 成藏模式

Abstract:

The migration and accumulation phase of biogas in the Quaternary of Sanhu area in Qaidam Basin is mainly free-phase gas accounted for more than 70% in total, which can provide the material base for the accumulation of free-phase biogas in this area. Biogas pools underground are mostly controlled by contemporaneous trap. So, the free-phase gas expelled and released after shaping of the syn-sedimentary anticline in the Lower Pleistocene(1.35 Ma before present)is the effective expulsion gas quantity. The compaction hydrodynamic and buoyancy are the direct motivation for the vertical movement of the free-phase gas and can provide 9.72×108m3/km2 of effective expulsion gas quantity. The downward infiltration hydrodynamic is the impetus of lateral migration of the contained gas current and can offer 1.08×108m3/km2 of effective expulsion gas quantity. According to the dynamic,quantity and style features of free-phase gas migration and accumulation, the Quaternary gas accumulation model can be summarized as "self-generation and self-accumulation, dominated by vertical migration-accumulation near the source and controlled by the contemporaneous trap". The geologic resources of biogas count up 11 210×108m3 and the possible reserves are 5 604×108m3 in the Quaternary of Sanhu area.

Key words: Qaidam Basin, Sanhu area, Quaternary, free-phase biogas, contemporaneous trap, effective expulsion gas quantity, gas pool-forming model

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