The Method Research Of Well Logging Interpretation On Fractured Reservoir

Firstly the thesis introduced geological and geophysical characteristics of fractured reservoirs including fracture definition, classification, and the influence on the reservoir. Based on the analysis to the geological and geophysical characteristics of reservoir, the thesis offered an interpretation way of fractured reservoir by using conventional logging data. Moreover, the thesis applied this method to interpret volcanic rock, sandstone rock and carbonate rock individually .At last, the thesis tested the interpretation results by comparing the interpretation results and the well data which is already confirmed right by the real geological circumstances.Fractures in reservoirs are defined as macroscopic unconnectedness, which existed in rocks naturally and formed by deformation or physical diageneses. Originally they may be open, but they can be filled by minerals at last. So they can both be advantage or disadvantage for the flowing of fluid in rocks. According to the genetic classification, fracture system can be classified as follow: structure fracture, regional fracture and shrinkage fracture. The most important feature which affects reservoir dynamic characteristic in fracture system, is fracture morpholoy. Whether fractures are open or not, whether fractures deform or not, whether fractures are filled or not will influence reservoirs directly.Most interpretation way took homogeneous model as interpretation model for past time .Now since fractured reservoirs have serious nonhomogeneity, they need nonhomogeneous interpretation model to suit them. So the thesis first set up a correct nonhomogeneous model ,then based on the model ,calculate parameters of reservoir such as porosity ,permeability and saturation.During the process of getting reservoir parameters, the thesis adopted multiple curves to calculate parameters comprehensively. Especially for matrix porosity andfracture porosity, the thesis took a way of multiple curves integrated discrimination instead of only using acoustic curve at past.During the period of the thesis research, a project about volcanic rock in Liaohe Basin started. So a lot of volcanic data in Liaohe Basin were gotten .The thesis processed and interpreted 31 volcanic rock wells and test the interpretation results with the well data which is already known. Besides,the thesis also processed and interpretated another 3 sand rock wells and 2 carbonate wells to test the applicability of the method .Generally speaking ,the test results show that the method provided by the thesis has well effection on the fractured reservoirs to a certain degree.