In order to solve the problems in Oilfield Q

such as unclear understanding of geological model

strong heterogeneity of reservoir development and complexity of production performance rule

the sedimentary characteristics and the fracture development of carbonate rocks in buried-hills have been summarized by comprehensive application of logging

drilling and coring

rock section

logging and 3 D seismic data. The results show that

the Karst slope and highland are the main development areas of dolomite

where the karstification is intense and the dissolution pores are developed. The fractures are easy to appear so as to form the high-quality reservoirs. Karst depression mainly develops calcareous mudstone or argillaceous limestone

with poor reservoir physical property. The upper oil formation is mainly fractured reservoir with large thickness and developed fractures

while the lower oil formation mainly develops dissolution reservoir. On the basis of this achievements

the geological mode is summarized and the geological model of a dual porosity medium reservoir is established by combination of dynamic and static methods. This achievement has been well applied in the actual development of the oilfield

and has a certain guiding significance for the fine and efficient development of similar fractured reservoirs.