Abstract: The study on positive inversion tectonics in Jiyang Depression is relatively insufficient, lacking systematic and regular research. Based on high-precision three-dimensional seismic data, combined with regional stress field and unconformity characteristics, the positive inversion tectonics in Jiyang Depression has been comprehensively identified and interpreted, and the relation between development characteristics of positive inversion tectonics and hydrocarbon accumulation has been discussed. The results show that the typical positive inversion tectonics mainly developed in Chengbei 20 Fault in Chengdao Area and the eastern section of Chennan Fault in Dongying Sag. The positive inversion tectonics shows obvious reversed compressional anticline in hanging wall and it formed under the background of regional compressional stress field in Upper Cretaceous and in the end of Dongying stage of Paleogene. The identification of positive inversion tectonics must be fully considered the transition of area stress, the development characteristic of unconformity, difference of tectonic style, stratum and sedimentary facies. The development of positive inversion not only can destroy or reform the existed reservoir, form favorable anticline and unconformity traps, improve reservoir property, but also be favorable to form reservoir of anticline, stratigraphic overlap and unconformity.

Key words: positive inversion tectonics, development characteristic, hydrocarbon accumulation, Jiyang Depression