Study Of Reservoir Architecture Of Gudao Oil Field, Bohai Bay Basin

The study area locates at wellblock-28-8 of the centre of Gudao oil field,Bohai Bay Basin. It is structurally southern Gudao drape anticline. The typical crowd-well area of wellblock-28-8 was selected as the main project, and the up segment of Guantao Formation as the study target. The stratigraphic model have been set up to research the sedimentary facies and high resolution sequences stratigraphy, in order to make sure the reservoir characteristic using the basic information, such as the cores, seismic and log. And then, the reservoir attributes could be identified, and the knowledge base of reservoir geology were set up. By making use of all kinds of interpolation and simulation methords of geo-statistics, selecting the suitable stochastic simulation approaches, the structural models could be formed. And then, the reliability and practicability of the models were inspected by means of cross check and fractal analysis. On basis of all the forward steps, gridding could be done, and last 3D- visualization were realized.In this dissertation, delicate comparison and classfication of the sublayers have been done, by combining the quiescent research and dynamic productivity, taking the comparison of sediment cycle-sediment time cells as the main methord, and following many other comparison orders. On the basis of the delicate comparison of sublayers, hole deviation correction and K.B. correction, the mini-structure of the upsurface and subsurace of main reservoir sublayers of Guantao Formation were studyed, which had been dentified as river faces. Three mini-structure in the area were identified: forward direction structure, negative direction structure and sloping direction structure.Following the guide of structural model of river facies, three subfacies and six microfacies were identifyed, as well as three interbedded strata and four barrier beds, by making use of the way of combination of static and dynamic, and the combination of microscope and macroscopic characteristics. And then, the patterns of all kinds of the layers could be known. Making use of the methord -"facies-controlling modelling"in the research, the sedimentary face models were setup by equential denotation simulation, and then, the 3D visualization were found by equential gauss simulation.After finishing the reservoir model, the agreement degree of the model was inspected with actual data, and the results were good. At last, on the base of the model, the reserve in the target area was prodicted.