关键词: 库车坳陷, 构造特征, 层序, 盐构造, 油气勘探

Abstract: During Yanshan and Himalayan orogeny,various types of deformation and their assemblages in the Kuche depression,which lies in the northern edge of the Tarim Basin,was formed in deep middle and shallow layers and controlled by Tertiary wriggling salt rock and Jurassic sliding coal.These layers styled in distinct deformation,combination and different distributing characteristic in the plane.According to the mechanism and characteristic of the deformation,the structural deformations are classified into three sets of sequences:1 Shallow sequence.Its boundary is the bottom of Tertiary salt rock.The deformation is due to the combined effect of wriggling salt and structure squeezing.The structural highs migrate violently.2.Middle sequence is dominated by the strata between Tertiary salt and Jurassic coal,which is controlled by structure sliding and often forms structural zones.3.Deep sequence is weakly deformed.The middle sequence bellow salt can accumulate hydrocarbon migration through the faults.Besides,it has integrated and belting structures which are sealed by salt rock.It has the most favorable condition for forming reservoir and is the key strata for hydrocarbon exploration.

Key words: Kuche depression, structural feature, sequence, salt structure, oil-gas exploration