THE DEFINITE RESERVOIR CHARACTERIZATION OF THE FOURTH MEMBER OF SHAHEJIE FORMATION OF FAULT BLOCK 81 OF ZHONGYUAN OIL FIELD

Fault block 81 reservoir of Zhongyuan oil field was found in 1980. After many years of development, the production declined due to the declining of the stratum energy. The definite modeling approach is adopted to establish the reservoir geologic model. There are four steps to carry out the definite modeling: to prepare the data, to establish the single well model and stratigraphic framework model, to carry out spatial value assignment and to display the geologic map. The definite reservoir characterization of the fifth parasequence of the second parasequence sets of the fourth member of Shahejie formation of Fault block 81(S425) of Zhongyuan oilfield is carried out. First divide and correlate the strata. Then digitalize and reexplain the well logs. Next assign the explanation value of well logs spatially. And the step is to last establish the reservoir model. The research above lays a foundation for the next project setting of oil production.