鄂尔多斯盆地西缘构造分区及其特征

Structural division and characteristics in western edge of Ordos basin

赵红格 刘池洋 王峰 王建强

Zhao Hongge Liu Chiyang Wang Feng Wang Jianqiang

鄂尔多斯盆地西缘受秦岭-祁连山构造带和阿拉善地块长期活动的影响,地质构造复杂。通过重力、航磁、遥感和地震等多种资料的综合分析,鄂尔多斯盆地西缘由于中区横向构造带表现明显,可以将其分为北区、中区和南区。根据各区内分布的次级隐伏构造或明显的东西向断裂,北区分为桌子山段和横山堡段;中区由转换带和马家滩段组成;南区进一步分为沙井子北段、固原段和华亭南段;区段之间构造特征差异显著。目前发现的天然气多集中分布在横山堡段的逆冲断块和背斜中,石油多分布于马家滩段及其邻近的逆冲推覆构造中。

The geologic structures in the western edge of Ordos basin are complicated due to the long active movements of Qinling-Qilian tectonic belt and Alashan massif. Based on comprehensive analysis of gravity,aeromagnetic,remote sensing,seismic and other data,the middle sector of the western edge of Ordos basin can be divided into the northern,middle and southern zones,according to the distinct characteristics of latitudinal structural zones.The northern structural zone can be further divided into Zhuozishan and Hengshanpu segments,the middle zone can be further divided into transform zone and Majiatan segment,while the southern zone can be further divided into Shazijing north,Guyuan and Huating south segments,with each segment having remarkably different structural features.Most of the gas reserves have been discovered in the thrust blocks and anticlines in the Hengshanpu segment,while most oil are commonly distributed in Majiatan segment and in the adjacent thrust nappe structures.

10.11743/ogg20060206