Abstract:

Lixian Slope is located in the western Raoyang Sag,overall,the slope dips towards south-east,strikes north-east and is a monoclinic structure.Faults are well developed on the slope,most of the faults strikes the NE or NEE,and are at right angle with the slope.Fault pattern is mainly made up of ladder en echelon faults and secondary faults and the main fault of the Y-shaped composition,anti-Y-shaped,dendritic fault combinations which reflects it suffered stronger extensive stress and tensional-shear stress.Slope is mainly made up of Gaoyang,Yanling and Xiliu structure belts,Yanling structure belt develops with many small fault blocks and the nose-shaped structures and Gaoyang structure with large-scale of the fault structure nose.Xiliu structure develops with small-scale of the grabbed-type fault trough structure,block and small-scale fault structure development of the nose.The slope was mainly developed in Shahejie of Dongying period，the early Himalayan tectonic movement plays an important role in the development of the slope,during the period of midde and late Shahejie periods,sedimentary phase belonged to the next one of deep sedimentary paleo-uplift tectonic setting up of the succession of developmental stages of drape.In Xiliu and Yanling tectonic belt,there is the distribution of a certain size fault block traps where has not yet been drilled,and oil and gas accumulation is in a favorable position with a certain degree of explorative potential.

Key words: Raoyang Sag, Lixian Slope, Shahejie Formation, fault, structural characteristic, evolution analysis