Hangjinqi Block is located in northern Ordos Basin and has three unconformities including the Upper Paleozoic-Lower Paleozoic

Upper Paleozoic-Paleozoic and Upper Paleozoic-Archean.Logging data

core data and cutting logging data were integrated to study the characteristics of unconformity space structure in detail.In addition

hydrocarbon migration characteristics of various types of unconformity structure were also analyzed in combination with the carriers above and below the conformities and distribution of gas reservoir.It also figured out the distribution area of advantageous migration pathways.The research shows that there are nine unconformity configuration types in Hangjinqi Block

namely sand-mud-sand

sand-mud-limestone

sand-mud-metamorphic rock

sand-metamorphic rock

sand-limestone

mud-mud-sand

mud-mud-limestone

mud-mud-metamorphic rock and sand-mud-mud.And there are three kinds of migration pathways

namely double migration pathway I-type

single migration pathway Ⅱ

1

-type and single migration pathway Ⅱ

2

-type

among which the double migration pathway I-type is the primary pathway and is mainly distributed in three areas.The largest area is in the central-eastern part of the block

and its target traps are Shilijiahan in the south of fault and ShiguhaoYin the north of fault.And the second area lies in the western block and its target trap is Xinzhao.The smallest area lies in the eastern block and its target trap is Azhen.Double migration pathway is poorly developed in Shilijiahan trap and is favorable for the in-situ enrichement and accumulation of gas.