Lixian Slope was a key block of oil exploration in Huabei Oilfield,because of carbonate cementation,complex pore structure,high changes of water salinity in the block,there existed coexistence of low resistance oil reservoirs and low porosity and low permeability reservoirs.Based on systematic analysis of experimental data,the main control factors of reservoir influence were studied,analyzed and determined.Aiming at the specific characteristics,the method of reservoir evaluation was studied,the interpretation method and model suitable for this block are determined.Through the data processing,the feasibility and usability of the method is verified.
With Block Yangerzhuang in Dagang Oilfield as an object of study,a quantitative interpreting model for water-out reservoir interpretation of the block is established by using the relative resistirity method on the basis of integral analysis of geologic,logging, well-testing and formation testing data. The model is used to process the data from 5 wells with coincidence rate of 82. 9%.
Water flooded layer interpretation model is established using relative value of the electronic resistivity.And from this model,these parameter,such as the porosity,water saturation,irreducible water saturation,clay content,residual water saturation,oil relative permeablity for oil,water relative permeablity for oil,water productivity are formulated.After date processing of the 16 layers in 5 logs of the lower Es2 in Pucheng Oilfield,the coincidence rate reaches 87.5%.
A method is proposed for qualitatively diagnosing water-out zones, which is simple with less calculation. The level of water-out reservoir would be diagnosed based on logging curves and related parameters. The method is proven to be of good performance with coincidence rate of 83.8% after it is used for data processing in 12 wells in Dagang Oilfield, thus the method would be widely used in oilfields.
This paper does simple linear regressions between COD in the water body of the point of Hei River-Luo Deng bridge (COD_H) and COD in the water body of heavy polluted source by using Hei River′s and four polluted source (Luohe City ) monitoring data in step,and so to find the correlations between COD in the water body of the point of Hei River-Luo Deng bridge and COD in the polluted water body of Yinge combines(COD_Y) and gets one regression equation: COD_H=0.755COD_Y-15.36.Then it demonstrates that the linear correlations between COD_H and COD_Y is extraordinarily significant at a significance level of 99.9% by means of significance tests on correlation coefficient and regression coefficient.It furnishes technical support for environmental management.
Taking water flooded layer at 8 area of Lower Wuerhe Formation as the research object,based on the experiment,well logging,test oil and geological data,using the relative resistivity technology for support,we established interpretation models of water saturation,bound water saturation,residual oil saturation of water flooded layer at 8 area of Lower Wuerhe Formation,and the actual logging data of objective block were dealt with.The practice proved that this model was good,which layed a foundation for further developing the evaluation method of water flooded layer at 8 area of Lower Wuerhe Formation.
By taking Gangxi Block of Dagang Oilfield as an object of study, a quantitative interpretation model suitable to watered-out reservoir interpretation in the block is established, which combines conventional logging, induced polarization potential logging with complex resistivity logging on the basis of comprehensively analyzing the data of its geology, well logging, logs and formation testing. It is used for data processing for 24 wells with coincidence rate of 81.6%.
The well logging and mud logging are intertwined each other.It is very important to analyze the logging data and its response characteristic of the reservoir.The relationship of the four properties was analyzed by use of the lithologic analysis data and logging data,and the change characteristic of the logging curve was found.The displaying feature of the cutting logging,geochemical logging and gas logging were anlyzed,which provided reliable evidences to the qualitative and quantitative interpretation.
