Study On The Log Interpretation Method Of The Waterflooded Formation Inshuguang Oilfield

Having been developed for four decades, now Shuguang oilfield has entered the stage high water cut, and water injected in the reservoir has greatly changed the relations between water and oil, as well as the four sexual relations, which causes diverse logging response. Many reservoirs have similar changes in the logs, but the flooding situation has big differ ence, which make water flooded layer logging interpretation more difficult, and a thin-poor layer interpretation in water flooded layer always do not reach good effect. As a result of this, the difficulty of oilfield water injection development increases, which becomes a constraint to the development of oil. Therefore, improving the water flooded layer logging interpretation accuracy is a very heavy and urgent problem in a new era.In response to this situation, the paper studies the sealed coring data and logging data response characteristics about the middle-last period layer of Shuguang oilfield. In this paper, we apply a combination of gradient method to successfully realize qualitative evaluation of the reservoir flooding, and apply another double formation water resistively model and shale and sandstone volume model to calculate reservoir parameters, and further complete the Shuguang oilfield flooding interpretation, called "qualitative before, quantitative after‖, which overcomes the problem that clay content and formation water resistivity can not be calculated accurately.In this paper, combination of gradient model and resistivity model are established to deal with the actual well data, and compare with results of core analysis, finally complete flooding formation evaluation and interpretation. The results show that this approach is conducive to the accuracy of water flooded layer interpretation, and achieve qualitative and quantitative interpretation.