Hangjinqi area is one of the major gas exploration targets in Ordos Basin.Analyses of occurrence characteristics

composition and homogenization temperature of fluid inclusions from Hangjinqi area were carried out to identify the main gas reservoiring stages and timing.The results show that fluid inclusions from the Upper Paleozoic Hangjinqi area are mostly distributed in quartz overgrowth or healed fractures of pebbly sandstone

medium-grained and fine sandstones.Two stages can be identified with gas/liquid hydrocarbon inclusions and gas/liquid brine inclusions dominated.They can be oval

sub-prismatic

long strip

semicircular

and irregular in shape with carbon dioxide and methane as the dominant gas components.The homogenization temperature distribution of brine inclusions

associated with hydrocarbon inclusions

has a wide range and multiple peaks.Samples from three plays

namely the Shilijiahan

Xinzhao

and Shiguhao

in the area

show a remarkable disparity in their homogenization temperature distributions.By projecting the homogenization temperatures of the inclusions from the plays on the paleo-geothermal field evolution history of the area and analyzing the thermal evolution history of source rocks

we suggest that the primary reservoiring stage of Shilijiahan play is from the Eocene to the present.The Xinzhao play also has its primary reservoiring period from the Eocene to the present

but there is the possibility of a secondary reservoiring stage ranging from late Early Jurassic to middle Late Jurassic.The reservoiring stage in the Shiguhao play is still from the Eocene to the present based on inclusion temperature data and gas migration characters.