Study On Microcosmic Pore Structure And Seepage Character Of Chang-8₂ Of Zhuang 19 Area In Xifeng Oilfield

By using the theory and methods of sedimentology, reservoir geology, mineralogy, exploitation geology, reservoir engineering and reservoir chemistry, taking Chang-82 Layer of Zhuang 19 Area in Xifeng Oilfield as examples, with natural sandstone micromodels oil-water displacement experiment and CT scan technology, emphasised on studing the microcosmic pore structure and seepage character of Chang-82 of Zhuang 19 Area in Xifeng Oilfield. By micromodels oil-water displacement experiment ascertained the difference of displacement efficiency in vary displacement pressure and vary water multiple, analysed and fond out the major factors affecting reservoir displacement efficiency. The micro and macro, dynamic and static, and theory and practice were combined in the study . There are many theory value for making scientific and reasonable project to improve the displacement efficiency. The mainly fruits are as follows:1. Studied the characters of the sedimentary microfacise, analysed the characters of different geneses type of each sandstone. There are underwater distributive river curse of fan delta front, river mouth bars and distributive bay, at the same time analysed the character of the distributing of sandstone, physical properties and oil saturation, made the study combined with oilfield exploitation.2. By using the cluster analysis mathematical method, the reservoirs formation can be classified three different flow units, and analysed the distributing and permeability character of different type in lengthways and horizontal.3. Studied the characters of reservoir geology, include the character of microcosmic pore structure,deagenesis. Analysed the character of inner-heterogeneity and inter-heterogeneity of the reservoir in study area.4. Used the natural sandstone micromodels oil-water displacement experiment to study seepage mechanism of the area .validated by CT scan technology at one time, made the conclusion to be true. The research represents that reservoir heterogeneous quality affected displacement efficiency seriously, round pressure influenced the effect of injected water, especially for fractured porous media. Keeping stratum pressure can restrain the overspread of latent and clearfracture .Choose reasonable inject pressure is important to improve the displacement efficiency.