The Study Of Fluids Distribution In Karst Reservoir Of Ordovician In Salt Coverd Area, Southern Tahe Oilfield

Based on the reservoir characteristic, identifying of the fluids type, the origin of the oil water and the relationship of water and oil in diffenent fault belts, studies the distribution of different fluids in the salt covered area, southern Tahe oilfield.Based on the former studies, using the neural network which is trained by the data from well testing, identify the fluid type of the studying area.Reveal the origin and characteristic of the oilfield water correctly by the the following maps: the scatter diagram of hydrochemistry, the diagram of hydrochemistry parameter varying with depth, the chorisogram of hydrochemistry. It is concoluded that the oilfield water in the studying area also contains three types: atmospheric water descending flow in karst stage, sedimentary buried water from compacted mudstone centrifugal flow in nonexposure stage, and the mixture fluids of the above two. At the same time, the vertical zonation and planar division of the oil water are studied.As to the relationship between water and oil, combined the data of geology, production dynamics, hydrochemistry, the well have big differences in different fault belts and the different place in the same fault belt. The relationship in single well fracture-cavity unit contains: water style, oil style, the ordinary style and compound style. And the relationship in several wells fracture-cavity unit is complicated. There is no united water-oil interface and one or several water bodys provide energy to the fracture-cavity unit.According to data of the covery of upper Ordovician, the migration of oil and gas, characteristic of faults and the main migration path of oil and gas, it is concluded that the covery of the upper Ordovician controls the longitudinal distribution of oil and gas and the oil migration of the Himalayan stage and the main migration path is a dominated factor in plane surface disbribution. Based on the former studies, the realationship between fault belt and hydrocarbon kitchen, the match of different faults and the distribution of oil and water, identify seven main paths. The areas surrounded the main path is a hopeful area for oil and gas explation and these areas far away from the main path usually not very good.