地学前缘 ›› 2009, Vol. 16 ›› Issue (5): 251-263.

• 论文 • 上一篇    下一篇


空间数据库技术实现定量古地理研究——以鄂尔多斯盆地中奥陶统一个三级层序的形成时间为例

李斌 程长青   

  1. 1中国石油大学(北京) 资源与信息学院, 北京 102249
    2中国地质大学(北京) 地球科学与资源学院, 北京 100083
  • 出版日期:2009-09-10 发布日期:2009-09-10
  • 作者简介:李斌(1970—),男,博士，古生物学与地层学专业。Email: libin9600@sohu.com
  • 基金资助:

    国家自然科学基金创新群体项目(40621002); 中石化海相油气勘探前瞻性项目(G080006ZS319)

Application of spatial database in quantitative study of lithopalaeogeography—A case study of a Middle Ordovician sequence interval in Ordos Basin.

LI Bin CHENG Chang-Jing   

  1. 1School of Resource and Information Technology, China University of Petroleum(Beijing), Beijing 102249, China
    2School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
  • Online:2009-09-10 Published:2009-09-10

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摘要：

以沉积层序为时间单位进行岩相古地理研究需要对野外剖面、测井、录井、地震、岩心等海量数据进行定量分析对比,而传统的人工方法往往难以有效地管理并利用这些资料。文中使用空间数据库技术将基础地质数据以自然层为单位,按统一标准定量化处理;并以层序为单位计算、统计、分析,提取厚度、白云岩含量、灰泥含量、陆源碎屑含量等反映沉积环境特征的多种单因素,定量绘制各单因素等值线图。在区域地质背景分析的基础上,将各单因素等值线图叠加分析,并探索定量古地理研究方法——通过单因素复合公式计算值划分古地理单元的边界,最终绘制出古地理图。以鄂尔多斯奥陶系马五组上部一个层序时段(464~466 Ma)为例,运用上述方法自动识别出古陆、山丘高地、潮上带、潮间带、潮下带等古地理单元。研究表明,空间数据库技术是实现定量古地理的有效手段。

关键词: 关键词：空间数据库;单因素分析;鄂尔多斯盆地;奥陶系;层序地层;岩相古地理

Abstract:

 In the study of sequence lithopalaeogeography, the quantitative analysis, precise calculation and detailed comparison of tremendous geological data, such as field profiles, logging records and seismic curves from different areas, are the basic requirements. In order to obtain a more reliable and precise result, we have developed a method, by using the spatial database to manage effectively the data that cannot be treated by traditional ways. Various attributes of the basic stratigraphic units and their characteristics, such as sequence thickness, penecontemporaneous dolostone content, shallow water plaster content, and terrigenous material content, can be fully utilized statistically in facies analysis and in mapping. Based on this analysis, we have exerted singlefactor isopachous mapping quantitatively for each of the Ordovician sequences in the basin, and we used a single factor formula to delineate the borders of facies units. Finally synthesis multiple factors have to be used to reconstruct the lithopalaeogeography for each of the sequence intervals. The study shows that the proposed method is quite effective and has a much higher resolution in recognizing lithopaleogeographic subunits than traditional ways. For example, in one of the Middle Ordovician sequence interval (444446 Ma) of the Ordos Basin, we have successfully mapped the precise distribution of various facies units, such as old land, submarine uplift, up tidal flat, middle tidal flat and down tidal flat.

Key words: Key words: spatial database; singlefactor analysis; Ordos Basin; Ordovician; sequence stratigraphy; lithopalaeogeography

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