Abstract: Jiaolai basin is a dextral strike-slip pull-apart basin. Its west and east boundaries are delineated by NNE-trending Tanlu faulting and NE-trending Moping-Jimo faulting, both of which developed as Ysheared fractures; its south and north boundaries by NE-trending Wulian-Rongcheng faulting developed as R- sheared fracture, while NEE-EW trending faulting developed as R'-sheared fracture. Its subsidiary basin is of geometry characteristics similar to them. The tectonic evolution and petroleum geology are characterized by that ① Laiyang period is dextral pull-apart rifting stage mainly formed source rocks; ② Late Laiyang-Early Qing- shan period is pulse sinistral transform-compressional stage; ③ Qingshan period is post-rift stage. Structural crack is the main space of reservoir and percolation of oil and gas in Qingshan formation; ④ Late Qingshan-Early Wangshi period is pulse sinistral transform-compressional stage; ⑤ Wangshi period is dextral pull-apart rifting stage, an important hydrocarbon generation stage in Early Laiyang epoch; and (6) its Cenozoic is an up-lift and subduction stage.

Key words: Jiaolai basin, pull-apart basin, dextral shear, structural evolution, Mesozoic