Research On The Method Of Determining The Water Flooded Level Of Thick Sand Bodies In Daqing Area

Along with the continuously development oilfield,Daqing oilfield has entered high water cut period,and most of the region water is serious,caused the reservoir resistivity logging response characteristics such as amplitude,shape on the curve,there was a certain amount of change makes the oil field water flooded qualitative interpretation work becomes very complex,and water flooded layer interpretation from volume,high degree of professional,characteristics of empirical,makes the qualitative interpretation of water flooded layer.Reservoir after water flooding,the movement rule of injected water,the scope,the effect of displacement is with reservoir lithology,physical property,wetting characteristics of sand body is closely related to the factors such as,under the different sedimentary environment was the inevitable formation sedimentary unit is controlled by sedimentary rhythm.Therefore,in view of such problems,according to the current technical problems of water flooded layer in qualitative interpretation proposed sedimentary units are the main factors control channel sand body distribution of flood levels and flooded law between different sedimentary units independent of each other,within the same sedimentary unit water laws were highly correlated,and sedimentary units correctly is the key to qualitative interpretation for water flooded.Geology sedimentary units on the map to the logging on,proposed to explain the basic concept of using stability boundaries of mudstone interlayer to separate interpretation unit symbol,the resistivity curve automatic interpretation methods and procedures.On this basis,log into and interpretation of sedimentary rhythm corresponds to one by one unit.According to deep(shallow)resistivity and density log curves,with thick sand resistivity curves of the average slope and density curve relative to the center of gravity for the discriminating parameters by computer automatically determine each unit contained in the interpretation of the original sedimentary rhythm type.And with every single standard rhythm is contrast in the middle layer,other parts of the rhythm of each layer,physical properties,and comparison,combined with the relative position of each layer and standard layer automatically determine each water level.In Daqing oilfield reservoir lithology,electrical,physical property and oil migration characteristics are studied,and combined with the feature of different water level logging parameter nodes,build all kinds of watered-out mode under different water level and the mapping relationship between well logging curve characteristics,extract the characteristic parameters and classifying different water level logging method,formation waters flooded under the level of logging characteristic parameter set,flooding pattern library is established.We use two sealed coring wells in the study area a total of 59,the computer automatically determine water level on each floor,and artificial interpretation of results compare with field experts,explained that the results were in line with layers for 50,overall accuracy reached 84.7%,shows that the man-machine interactive flood-level discriminant method is effective.And apply this method to a fault to the North East regional class of 36 wells in water-level qualitative Division.