地学前缘 ›› 2012, Vol. 19 ›› Issue (1): 209-220.

• 论文 • 上一篇    下一篇

高频层序格架下的地质地球物理模型与砂体预测

刘豪, 周心怀, 田立新, 赖维成, 郭涛, 李世燕, 张帅   

  1. 1. 中国地质大学（北京） 海洋学院， 北京 100083
    2. 中海石油天津分公司， 天津 300452
  • 收稿日期:2011-10-19 修回日期:2011-11-25 出版日期:2012-01-10 发布日期:2012-01-10
  • 作者简介:刘豪（1974—），男，副教授，矿产普查与勘探专业，主要从事含油气盆地分析、层序地层学、地震储层及隐蔽油气藏预测等方面的研究。E-mail: lhcugb@163.com
  • 基金资助:

    国家科技重大专项（2008ZX05023.002.001.003）

Geologicalgeophysical model in high frequency sequence framework and prediction of sandbody.

  1. 1. School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China
    2. Exploration & Exploitation Research Institute, Tianjin Branch of China National Offshore Oil Corporation, Tianjin 300452, China
  • Received:2011-10-19 Revised:2011-11-25 Online:2012-01-10 Published:2012-01-10

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摘要：

黄河口凹陷位于中国渤海湾盆地的东南部，新近纪发育大型浅水湖泊三角洲沉积体系，为本地区隐蔽油气藏的形成提供了很好的地质条件。论文以渤海盆地黄河口凹陷B34区块晚中新世明下段SQ1层序为例，将该层序划分了10个准层序组。通过对各准层序组详细的岩性统计发现岩性主要为砂岩和泥岩，厚度较大的砂岩主要分布在PSS1和PSS10，其他准层序组内部多发育薄层砂，砂岩的发育特征与其在同一层序中的沉积位置有关。在岩性统计分析的基础上，通过对研究区不同准层序组中均方根振幅与钻井井点位置岩性的统计、7类岩性组合的一维正演模拟等发现岩性及其组合与振幅之间存在如下关系：强振幅对应了较厚的砂体，振幅较弱则砂体不发育，振幅中一般为大套泥岩夹中薄层砂岩。据此以PSS1为例，进行了砂体的精细刻画。尽管建立了岩性和振幅强弱之间的关系，但定量确定砂岩厚度仍是十分困难的，因此只能根据振幅强弱来定性确定砂岩的相对厚薄。

关键词: 高频层序, 均方根振幅, 地质地球物理模型, 黄河口凹陷

Abstract:

The Yellow River Mouth Sag is located in the southeastern part of the Bohai Bay Basin, China. The large scale shallow water lacustrine delta developed in Neogene became profitable geologic conditions for the formation of concealed hydrocarbon reservoirs in this area. The authors take the sequence SQ1 as an example, totally 10 parasequence sets are divided to the sequence SQ1 of lower member of Minghuazhen Formation in Block B34 of the Yellow River Mouth Sag. Lithologic statistics show that the lithology is dominated by sandstone and mudstone. Thick sandstones are mainly distributed in PSS1 and PSS10, while thinbedded sandstones mainly developed in other parasequence sets. The developing character of sandstones is related with where they are developed in the same sequence. The studies include root mean square(RMS) amplitude in different parasequence sets and well lithology, onedimensional forward simulation of 7 kinds of lithology associations. The results indicate that lithology and its association  are correspondent to the amplitude  as follows: strong amplitude corresponds to thick sandbodies, weak amplitude corresponds to nondevelopment of sandbodies, and medium amplitude corresponds to a large set of mudstone intercalated with mediumthinbedded sandstone. The fine description of sandbodies was made taking the PSS1 as an example. It is quite difficult to quantitatively identify the thickness of sandstone although the relationship between lithology and amplitude is established. As a result, the thickness of sandstone is qualitatively determined according to the amplitude.

Key words:  high frequency sequence, root mean square (RMS) amplitude, geologicalgeophysical model, the Yellow River Mouth Sag

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