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.