Abstract: Interlayer can seriously affect the bottom water coning shape,remaining oil distribution,production water characteristic curve and ultimately affect oilfield development effect.Aiming at the problems,according to the sealed coring data and logging data,the research on the characteristics of ZJ1-5 of Wenchang oilfield and the causes of oil group of calcareous intercalation has been analyzed.Based on the core description and logging response characteristics,by applying the Petrel modeling software,the calcareous intercalation has been identified,which can be applied to the whole oilfield.By ultimately establishing the facies model,the distribution regularity of calcareous layer on the plane and vertical has been made clear and then the distribution regularity of the influence of bottom water reservoir development has been analyzed.The research results indicate the calcareous intercalation has the electrical characteristics of "three low-two high",the calcareous intercalation formation is controlled by diagenesis,and the calcareous intercalation presents continuous distribution.Under the case of incomplete packer,when the calcareous intercalation in oil layer has better distribution continuity,the bottom water coning is slower and the development effect is better.