Research Of Well Logging Evaluation For Sand-shale Reservoirs In The Jiudong Yinger Sag

The Cretaceous reservoirs rock properties,physical property change significantly in Jiudong Yinger Sag, Also, they are heterogeneity, high salinity formation water, and oil layers and water layers are little differences in resistivity property. These lead to this type of reservoirs are difficult to identify by log information. Based on traditional log interpretation theory, the reservoir identification methods are poor effects, and the compliance rate is low. In this thesis, based on a large number of petrophysical experiments, we carried out deeply the research of reservoir log interpretation and evaluation methods.Through the analysis of regional structural features, sedimentary environment, petrology signs, etc., divided the single well into different microfaces, and pick typical wells, and divided these wells profile into different faces. Through these, we mastered the sedimentary facies of the Jiudong Yinger Sag. Expanded the reservoir four-property relationship study furtherly. Analyzed the reservoir pore structure characteristics in detail, and provide the basis for the reservoir classification in follow-up.For the complex physical characteristics in Jiudong Yinger Sag, we determined the clay content in the area, by the rock physics experiments and the natural gamma log response value; established a porosity model, use of acoustic logging and natural gamma logging; keeping in mind the special characteristics of complex pore structure, established permeability models use of flow zone indicators, and improved the accuracy of the reservoir interpretation and evaluation. On this basis, Combination of logging and testing data, analyzed the reservoir macroscopic heterogeneity characteristics. Selected the appropriate characterization parameters of flow units, and described the parameters quantitatively, then we divided the reservoirs into 6 flow units. on this basis, conducted the reservoir comprehensive classifications, and the effect is fairly.Use of rock electrical properties experimental data under the normal temperature and pressure, analyzed the factors of bond index and saturation index, and determined the rock electrical parameters; Contrasting the Archie model and the clay sandstone model, because of low clay content in the area, there is little difference between the two model results, selected Archie formula to calculate reservoir fluid saturation, since the model is easy to use. In addition, we established the NMR experiment irreducible water and the reservoir quality factor relationship, and got the irreducible water saturation interpretation model.Analysis of the logging information, for different logging environments, researched the sensitive parameters that can reflect the fluid nature. Through with a reasonable of different parameters, enlarge the difference between oil layers and water layers, and quantified the reservoir interpretation standards. high resolution array induction logging can get different probing depth curves and can reflect the nature of reservoir fluid. Therefore, the resistivity value was normalized, and created different types of reservoir fluid identification plates. The effect is fairly. In addition, with testing data, analyzed yield factors in reservoirs, and used multiple parameters to predict the reservoir yield. Finally, keeping in mind the special characteristics of Jiudong basin, we have summed up the logging series which are suited to the geological features, and provided a reliable technical support for the further exploration and development of Jiudong basin.