Evaluation Method Research Of Reservoir Wettability And Phase Permeability Logging

Reservoir wettability and phase permeability, which are important factors that affect oilfield development and oil-bearing sand watered degree, play an important role in the development, the integrated management and stimulation of the oilfield.The reservoir phase permeability and wettability logging evaluation is still one of the major research tasks in the geophysical research field both at home and abroad. Progress in some areas has been made by science and technology personnel, but most of the research results are gained merely through core analysis in the laboratory, so there is't a good evaluation model that can be widely used in the practical interpretation now.At present, one of the most important problems that must be faced to enhance oil recovery ratio is to improve reservoir static and dynamic description level, to establish elaborate geology describing model, to estimate oil-bearing sand watered degree accurately and to identify the distribution of the remaining oil.Reservoir parameters, in particular the interpretation accuracy of the permeability is the key element to reservoir description and residual oil quantitative calculation.Therefore, it is important to the exploration and development of oil field to develop new logging evaluation methods to judge reservoir wettability accurately and calculate permeability with higher accuracy.In this paper, we first analyzed lithology character and physical character of the low-permeability reservoir on the basis of reservoir physics of the research of reservoir wettability and phase permeability, then enumerated the determing methods and the research situation of reservoir wettability and we presented the measuring method and application of the existing capillary pressure curve and the measuring method and application of the relative permeability curve.Through analysis and comparison we can draw a conclusion: most of the existing logging evaluation methods of reservoir wettability are mainly qualitative evaluations, and there are some limitations to them, so it is very difficult for them to be widely uesd in the wettability evaluation of reservoir.At present, the core analysis methods of applying nuclear magnetic resonance relaxation time to evaluate wettability of reservoir quantitatively have been relatively well developed, the laboratory studies by applying the relation between complex resistance frequency dissemination,dielectric measurements and wettability have indicated a better applying prospect. Evaluating wettability of reservoir continuously and quantitatively by using nuclear magnetic resonance logging, complex resistivity logging and dielectric logging information both alone and combined will be the very meaningful trend of research.