Abstract: The fault in southern margin of Junggar basin is divided into three fracture patterns based on theory of fault-fold correlation, the structural model and typical structural studies, such as piedmont thrust faulting pattern, shallow slippage-thrust faulting pattern and deep slippage-thrust faulting pattern, including analyses of their mechanisms and faulted styles. This paper suggests that the hydrocarbon source in southern margin of Junggar basin originates from deep Permian and Jurassic strata, and that good configuration of the faulted styles is the key factor for hydrocarbon accumulation. Also, the correlation of fault configuration and the mechanism for hydrocarbon accumulation are analyzed in detail by taking its typical structures as example here.

Key words: Junggar basin, fault, fracture, oil source, cap rock