Reservoir Parameters Of Putaohua Oil Reservoir And Logging Interpretation Methods Study Of Watered-out Zone In The Sanzhao Area

The eighth field of Daqing oil production is one of earlier waterflood development oil fields. After the rearrangement of the development phase the of basic well pattern and primary infill, now, it enters into the development phase of high water cut stage. As a result of the impact of injected water, many oil fields have been waterflooding and there is a change in formation characteristics:the electrical properties of rocks, pore configuration and hydrodynamic system are all in the process of dynamic change. In order to satisfy the demand for the submission of incremental explored reserves, the check of calculation of reserves, the establishment of geologic model of reservoir, delicate geologic description, in this paper, in view of Putaohua oil layer's reservoir trait in each oil field of Sanzhao region and the characteristics of the existing data, based on the test and the rock core analytical data as well as the reservoir trait under the work area. Using different methods and techniques and aiming at 2 sets of logging suite for six oil fields (block) to establish selectively for region of interest's porosity, permeability, saturation and other reservoir parameters calculation model. And based on the experimental analysis of electric rock and the arithmetic formula of formation water saturation of sand and mud stone profile to select analytical data as test, by means of the comparative analysis, we can found calculation model of water saturation.Directing to the serious reservoir heterogeneity and the variety of the type of sedimentary as well as the different varied regularity of lithologic character and physical property, the postflood waterflooding law of different rhythm layers in oil fields was sumed up. On the one hand, starting from the physical experiments of rock,the experiments of waterflooding and the experiments of facies and penetration, on the other, combinating of sealed coring information and infilling adjustment well production data and using a combination of theory and practice of the method, research to summarize the characteristics and laws of workspace waterflooding and form a method of qualitative calculation and quantitative identification of discriminating the level of waterflooding. Based on the methods of the establishment of two oil fields in the water flooded layer, develop a set of software system which can apply for the well logging interactive interpretation system of the the eighth field. After trial, the effect is obvious.Through research, this article has been made aware of the following:The serious reservoir heterogeneity lead to a serious waterflooding phenomenon of nonuniformity. In general, the high degree of waterflooding lies in High permeability layer and the low permeability layer has the low level of waterflooding. In addition, in thick bed, the level of waterflooding is high and the level of waterflooding is low in the thin bed. Most of the thin beds may be in non-waterflooding or in the low level of waterflooding. The layers with positive rhythm often occur at the lower part of the layer.According to different conductive mechanism, using theory to analogue and analyze the varied law of electric resistivity of the mixed liquid. Prove that the electric resistivity of the mixed liquid have something to do with the electric resistivity of the fossil water and the injected water, irreducible brine saturation, irreducible oil saturation, current water saturation, and with step shaped feature. Use water analysis date, sealed coring data backcalculation and MDT test data and the method of combining to get the date of formation water resistivity at the different level of waterflooding. We can resolve effectively the formation water resistivity value problem of the quantitative evaluation of the water flooded layer. At the same time, research and practice has proved that using natural potential to calculate the formation water resistivity is less effective.