Study On The Well-Logging Method Of Interpretation Of Water-Flooded Zones In Fuyu Oil-field

Fuyu oil-field development for several years, has went into the stage of the high water-flooded stage. The injected water has changed the original distribution of the oil-water reservoir in the state, resulting in the chang of its physical property, lithologic and oil saturation, due to the various well logging response. When the amplitude information for the curves are close in that many of reservoir, water-flooding characteristics on logging curve varies, which causes great difficulty for water flooded layers logging interpretation. This also makes it difficult to improve interpretation accuracy of poor thin layer of water-flooded zone, bringing lots of effect for oilfield water injection development, infilling adjustment and remaining oil description work etc, and and posing a bottleneck problem for reservoir management. Therefore it is of critical significance to increase the accuracy of logging interpretation for thinner poor pays which have been water flooded in developing high water cut oil field.In view of this condition,this dissertation focuses on log interpretation methods in high water cut stage in fuyu oilfield water injection development, taking the pressure coring data and production performance data as base, being based on water gravity shift principle, according to the main reservoir distribution ranges and the logging response characteristics of water-flooded layer, and hense, further qualitatively identifying the degree of water-flooded zone. Reservoir parameters are obtained with dual-formation water resistivity model and argillaceous sandstone volume model. Thus it can provide more accurate and reliable logging data, and overcome the question about oil/water inversion in conventional logging interpretation in Fuyu oil-field. The interpretation results of some wells using the state space model and resistivity model are given, and are compared with test results. It is shown that it can improve the accuracy of the evaluation for the watered flooded zone, and make the quantitative interpretation to be achieved.