The Permeability Evaluation Model of Bohai Yellow River Estuary Depression Based on Multi-oilfields

Li Peng;Li Dong;Meng Li;Zhang Zhang;Zhang Xin;China Oilfield Services Limited;

poroperm relationship;;regional permeability evaluation model;;graph theory multi-resolution clustering algorithms;;log facies;;lithofacies;;Yellow River estuary depression

In the reserve evaluation stage,the permeability calculation of each oil field mainly depends on the core porosity-permeability relationship model of the oil field,but for the oilfield with poor representation of the coring segment,the permeability error calculated by the porosity-permeability relationship model is large.Based on the similarity of response characteristics of reservoir logging in developed oil fields in the Yellow River estuary depression of Bohai,using graph theory multi-resolution clustering algorithms to make well log facies classification of the logging curves of multiple oilfield coring sections in the area,and combined with logging data,the correlation between logging facies and lithofacies was determined and a regional permeability evaluation model based on logging facies-lithofacies was established.The application results shows that,compared with the permeability calculated by the same exponential relationship model with less core data and poor representativeness,the permeability calculated by the regional permeability evaluation model based on logging facies-lithofacies constraint is more consistent with that calculated by core analysis,which significantly improves the evaluation accuracy of permeability.This model provides a permeability evaluation method for similar oil fields in huanghekou sag without coring,which can save the cost of coring and has certain guiding significance.