Abstract:

Panhe fault-block area is located in the western part of central uplift zone in Huimin sag.The pore structure of reservoir in the 3rd member of Shahejie formation can be divided into four types. The reservoir with super-high permeability, super-large pore and coarse throat pore structure has the highest oil displacement efficiency during the high water-cut stage; the simulation test can be as high as 70%～90%.However,the test run in actual rock sample, the oil displacement efficiency seem to be reduced (40%～75%),due to the non-homogeneous structure. The reservoir with high permeability, large pore and coarse throat pore structure has high oil displacement efficiency, which is usually 60%～80%. The reservoir with medium permeability, large pore and medium throat pore structure has relatively low oil displacement efficiency of about 40%～60%; and the reservoir with low-permeability, medium pore and fine throat has the lowest oil displacement efficiency, 30%～50%.However,the pore system in the reservoir does not consist of only one of the above-mentioned 4 pore structures, it is exactly the composition of several types of pore structures.

Key words: reservoir, pore, oil displacement efficiency, Panhe fault-block