The Logging Reservoir Evaluation Of 2rd Member Of Shahejie Formation In Daluhu Oilfield

The porosity, permeability and saturation are important parameters which are used to evaluate hydrocarbon reservoir and calculate reserves.The geological condition is very complex in the second member Shahejie formation in Daluhu oilfield. The lithology and physical property changed because of the invasion of diabase in part of the reservoir. Accurate physical property parameters, propel interpretation models and identifying favorable reservoirs are specially important because of the low porosity, low permeability, anisotropy and heterogeneity of the reservoir. Moreover, it is also important to describe the logging characteristics of reservoir in details for rational development。The research begins with the geology characteristics of sandstone in the region, by means of well log standardization and core experimental research, and a set of interpretation models (such as porosity, permeability, saturation, net pay and so on) are obtained after experimental researches on the basis of the study of the lithology, physical property, electrical property and oil-bearing property. The classification standard are redivided by the study of the response characteristics of reservoir in logging and combined with the formation testing data, The new log interpretation model and the crossplots were used to establish the new explanation plots and interpretation standards for the oil, water and dry layers of this field. The invasion conditions and the influence for the reservoir of the two intrusion rocks are traced by linked-well section technology, The lithology and physical property changed because of the invasion is one of reasons that effects the mistaken interpretation beds, which were not in accordance with oil test results.Based on the local geological structure and response characteristics of in logging, the distribution of target strata and oil-water relationship of the sandstone body No9 and No10, and the analysis of the influence of the two intrusion rocks for the reservoir are described in details,and the new interpretation mode is incorporated with oil-test and geological data were used to re-evaluate the reservoir and describe the logging characteristics of the reservoir,and the distribution diagram of the oil layers of the No.9 and No.10 sandstone body in this field, the contour maps of the porosity, permeability and saturation of the No.10 sandstone body are plotted, and the logging response characteristics are explicitly described, which can provide accurate data to fully develop the reservoir.