The Complex Lithology Reservoir Parameter Calculation And Application In Changqing Oilfield Zhou Jiawan Region Chang 6 Formation

The Changqing oilfield in ordos basin in the JiYuan and Bai Bao areas,and ansai ZhiDan areas were found a large amount of high-level radioactive anomaly of sandstone reservoirs,such abnormal sandstone tend to have relatively high natural gamma,it is difficult to differentiate between mudstone and argillaceous rock in log interpretation,and it is difficult to guarantee the evaluation of oil-bearing property due to the complex characteristics of resistivity change.It is found that high-gamma sandstone can be used as an effective reservoir for fluids,and some high-gamma-grade sandstones with higher oil-bearing grades are of value in production and development,and some high-gamma reservoirs After the development and testing to obtain a stable industrial oil flow.As the Changqing Oilfield does not have a well logging interpretation model for high-gamma-sandstone reservoirs,the loss of high-gamma-sandstone reservoirs or the underestimation of production capacity make the interpretation of high-gamma reservoirs not consistent.In this paper,the study of the Chang 6 strata in Zhoujiawan area has been carried out on the basis of the mercury injection experiment,the cation exchange experiment and the rock electric experiment.Based on the pore structure and reservoir type,pore-throat distribution,conductivity mechanism and petrophysical properties of high-gamma sandstone and normal sandstone are analyzed in detail.Based on the experimental results,a well logging interpretation model is established for the reservoir parameters of porosity,permeability,oil saturation,bound water saturation and clay content of high-gamma sandstone.Based on the well logging interpretation model and the well logging data,the high gamma reservoir in the exploration wells in Zhoujiawan area is interpreted.Based on the test data and oil production data,the fluid properties of the high gamma sandstone reservoirs in Zhoujiawan area are established the interpretation method of this area is improved and the technical problem of the interpretation and evaluation of the high gamma sandstone reservoir in the area is solved.