Various data including core description

conventional thin sections

casting thin sections and SEM

in combination with conventional physical properties of reservoirs and exploration results

were used to systemically analyze reservoir poroperm characteristics

reservoir space types and influencing factors of reservoir properties of the 2

nd

member of Shahejie Formation.The study indicates that Shahejie Formation reservoirs are mixed carbonate/siliciclastic rocks dominated by bioclastic dolostone with thin sandy conglomerate interbeds.The poroperm characteristics are very good

with average porosity of 27.6% and permeability of 442×10

-3

μm

2

.The reservoir spaces are dominated by primary pores(mostly intergranular pores and skeletal pores)and secondary pores.Sed- imentation and diagenesis are the two key factors controlling the physical properties of reservoirs.Dissolution and dolomitization contribute to high quality reservoir spaces.In addition

the distribution of high quality reservoirs is also delineated.It is believed that dolostone reservoirs are favorable for hydrocarbon accumulation

thus are potential exploration targets in the future.