Shengtuo Oilfield Fluvial Facies Reservoir Architectural-Elements Analysis And Remaining Oil Research

Nowadays, Shengtuo oilfield has already been in high water-cut stage. During the period of production , many problems such as high composite water cut, high degree of reserve recovery, too fast production rate, low reserve and production ratio and low recovery ratio has happened. It is very difficult to find the distribution of remainder oil. The development object has already been changed from oil layer groups to single layer. The main contradiction between formation and formation has already been changed to the contradiction among architectural-elements. The geological models which were established by simple ways has already not fitted the require of production. It is cry for finding more accurate geological models to guide the production.Take 34 layer in Es2 of No.2 area in Shengtuo oilfield for example, we establish fluvial facies reservoir architectural-elements 3D distribution model, confirm the identify standard of architectural-elements, find the way which architectural-elements affect the distribution of remaining oil. All of these works can provide theory support for improving recovery ratio.On the basis of fluvial sedimentology and modern sediment facies study, applying computer technology, log interpretation, stochastic simulation, numerical reservoir simulation and core analysis technology we can establish fine architectural-elements 3D distribution model and remaining oil distribution model. By the way of analyzing architectural-elements 3D distribution model, we can find the remaining oil distribution rule.On the basis of 15 coring holes'analysis and assay and taking many factors such as lithology, sediment feature, electrical feature into account, 9 lithofacies types, 7 rank interfaces and 7 architectural-elements are established. 7 architectural-elements are consist of channel charge, channel bar, natural levee, crevasse splay, channel lag deposit, floodplain fine grain and interlayer. The architectural-element 3-D spatial distribution model was founded by the way of stochastic simulation. The new method that establish reservoir property models(which include porosity permeability oil saturation) was controlled by architectural-element 3-D spatial distribution model. Another model that only less a few wells was established to test the accuracy of architectural-element model. The result of the test reveales that the architectural-element 3-D spatial distribution model is more accuracy and more reliable. How architectural-elements assemble, what characters they have and in which way the architectural-elements combination control the distribution of remaining oil are also interpreted in this paper. According to the distribution of architectural-elements, we adjust reservoir dynamic parameters. This paper used Eclipse software for reservoir numerical simulation and history match, then the remaining oil distribution model was established and the areas which remaining oil gathered were pointed out. This paper took a new way for fluvial facies reservoir remaining oil researching.