鄂尔多斯盆地北部晚古生代物源区分析及其地质意义  

ANALYSIS OF PROVENANCE OF LATE PALEOZOIC IN THE NORTHERN ORDOS BASIN AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：刘锐娥[1] 黄月明[2] 卫孝锋[2] 孙粉锦[2] 蔺洁[2] 

机构地区：[1]西北大学,陕西西安710069 [2]中国石油天然气总公司石油勘探开发科学研究院廊坊分院,河北廊坊065007

出　　处：《矿物岩石》2003年第3期82-86,共5页Mineralogy and Petrology

摘　　要：从构造演化、古地理变迁、源区母岩性质、陆源碎屑组分标型特征等方面对鄂尔多斯盆地北部晚古生代物源区进行研究发现 :区域上的南北隆起、中部坳陷的古地理格局决定了晚古生代鄂尔多斯盆地北部物源主要来自于北缘的阴山古陆 ,二叠纪呈 NNE向自北而南展布的河流三角洲及古流向 ,反映出陆源碎屑物质主要来自北部古陆 ,鄂尔多斯盆地内部及其北部的结晶基底以太古界和元古界地层为主 ,在盆地北部基岩分布及类型具有明显的分区特征并导致了东西部地区砂岩储集体岩性的差异 ,物源与有利储层的发育密切相关。Through analysis of the tectonic evolution, paleogeography, characteristics of the source rocks and the terrigenous clastic debris, the sedimentary provenance of the Northern Ordos basin was identified.In the Late Paleozoic period, the north and the sourth area of the Ordos basin were uplifted and the central area of the basin was depressed,indicating that the main sedimentary provenance of the Northern Ordos basin was from the Yingshan paleocontinent. The NNE distribution of the river-delta deposits in the Permian period showed that the terrigenous clastic debris was from the north paleocontinent. In the inner area and the north area of the Ordos basin, the main crystalline basement rocks belong to Archeozoic or Proterozoic era. The regional differentiation of the rock types and the distribution of basement rocks of the Northern Ordos basin were responsible for the east-west difference of the sandstone reservoir of the study area, and thus the distribution of the favourable sandstone reservoir was closely related with the sedimentary provenance.

关 键 词：物源 陆源碎屑 河流三角洲 晚古生代 鄂尔多斯盆地 构造演化 碎屑岩 

分 类 号：P588.21[天文地球—岩石学] P588.292[天文地球—地质学]