天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地榆林—子洲地区山2气藏成藏特征

赵丹枫,赵靖舟,陈莹   

  1. 西安石油大学地球科学与工程学院,陕西 西安 710065
  • 收稿日期:2012-09-25 修回日期:2012-11-25 出版日期:2013-04-10 发布日期:2013-04-10
  • 通讯作者: 赵丹枫maple.danfeng@yahoo.com.cn. E-mail:maple.danfeng@yahoo.com.cn.
  • 作者简介:赵丹枫(1987-),男,辽宁康平人,硕士研究生,主要从事油气成藏地质学研究. E-mail:maple.danfeng@yahoo.com.cn.
  • 基金资助:

    国家科技重大专项“中国大型气田形成条件、富集规律及目标评价”(编号:2011ZX05007-004)资助.

An Analysis on the Charateristics of the Shan-2 FormationGas Pools in Yulin-Zizhou Area of Ordos Basin

ZHAO Dan-feng,ZHAO Jing-zhou,CHEN Ying   

  1. School of Earth Science and Engineering,Xi′an Shiyou University,Xi′an 710065,China
  • Received:2012-09-25 Revised:2012-11-25 Online:2013-04-10 Published:2013-04-10

摘要:

榆林气田和子洲气田是位于鄂尔多斯盆地东部的2个地质储量均超过1 000×108m3的上古生界大气田,二叠系山西组2段是榆林—子洲气田的主力产层。鄂尔多斯盆地榆林—子洲地区山2气藏烃源岩在区域上呈广覆式分布,成熟度高;储层致密,源储近邻,生储盖组合关系良好;存在众多小型岩性圈闭群,圈闭界限不明显,很难判断气藏的边界;全区大面积含气,区域上没有明显的气水倒置现象,砂体连通性差,非均质性强,不存在明显的边底水;气水分布复杂、分异不明显,现今构造对于气水分布及产出基本不起控制作用;气藏的成藏富集主要受烃源岩的生烃强度,储层物性及有效砂体厚度联合控制。通过研究气藏的成藏特征、天然气成藏富集规律,表明鄂尔多斯盆地榆林—子洲地区山2气藏符合准连续型气藏“储层致密,主要为源外成藏、近源储集,天然气呈准连续分布,圈闭介于有形与无形之间”的特征。

关键词: 鄂尔多斯盆地, 榆林气田, 子洲气田, 上古生界, 致密砂岩气, 成藏特征

Abstract:

Yulin and Zizhou gas fields are two upper Paleozoic large gas fields,and locate in the east of the Ordos basin.Both gas fields have geological reserves more than 1000×108m3.The Permian Shan-2 Formation is the main reservoir for these two gas fields.Source rocks of the gas pools in the Shan-2 Formation are widely distributed and have high maturity.The reservoir is tight and near to the source,the source-reservoir-seal combination of which is rather good.A lot of lithologic trap groups exist,and the boundary of the gas pools is hard to judge.Gas generally exist in the whole area,but the gas-water inversion phenomena is unobvious.Sand bodies have bad conjunction and high heterogeneity.The distribution of gas and water is complicated,and the differentiation is not obvious,and the current tectonics play little role in the gas-water distribution.The accumulation of gas reservoirs is mainly controlled by hydrocarbon-generation intensity of source rocks,reservoir property and effective sand body thickness.In view of the accumulation characteristics and mode,it suggests that the gas reservoirs in Shan-2 Formation of Yulin-Zizhou area in the Ordos basin conform to the characteristics of quasi-continuous gas reservoirs,as is characterized by that the reservoir is tight,and accumulate outside but is maintained near to the source,and the gas is distributed in quasi-continuous pattern,while the trap is between visible and invisible. 

Key words: Ordos basin, Yulin gas reservoirs, Zizhou gas reservoirs, The upper Paleozoic, Tight sandstone gas, Accumulation characteristics

中图分类号: 

  • TE122.3+1
 

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