The Study On Finely Modeling Method Of Reservoir Geology Abstract And Distribution Laws Of Remaining Oil In The Fluvial Facies Reservoir

This paper researches water-flooded fluvial facier sandstone reservoir with severe heterogeneity as major object with the cases of Guantao member in west Qiqu of Gudong Oilfield of Shengli petroliferous province according to the properties of the terrestrial developed reservoirs in Mesozoic and Caenozoic era in China. under the guide of high resolution sequence strtigraphy theory, building the cycle sequences of different levels and the framework models of single sandbody based on the cycle theory of base level and sedimentary dynamics of the strtigraphic responcing process; integrating well logging and seismic date to forecast the reservoir thickness and attributes based on reservoir relative stability and stochastic seismic inversion; through analyzing dense spaced data, and and comparing the database with similar sedimentary microfaces and building the varigram model integrating geological, well logging and seimic data; finally, using geostatistics and stochastic modeling method to predict reservoir attributes.On the basis of fine study of the reservoir geological model by combining dynamic state and static state, a method of predicting the distribution of the remaining oil in this kind of reservoir in extra-high water-cut period was provided for determining the relative enrichment place, distribution law and controlling factors correctly. It will present the scientific basis for the proposing of the development regulating program and the exploiting goal so as to control the water cut and enhanced oil recovery. Main research achievements have been obtained in this paper as following:1. Using the isochronous correlation techniques of high resolution stratigraphic sequence, building the high resolution isochronous strtigraphic framework of the braided river reservoir and dividing the cycle sequences into the levels of single sandbody based on sequence structure and stacking pattern.2. With the advantages that the production performance and static data in the close spacing wells are very abundant, the accurate and real communicated width and thickness of sandbody are achieved and the reservoir finely modeling with constraints are carried out.3, on the basis of fine study of reservoir geological model, a integrated methodology and technology was provided in this paper to predict the formation and the distribution of the remaining oil precisely by utilizing reservoir exploitation geology, logging evaluation in water-flooded formation, production performance analysis, reservoir simulation and reservoir engineering. In the methods mentioned above, the reservoir simulation and the logging evaluation within the limited of flow unit were two new technologies in the prediction of remaining oil distribution.Fourth, the formation conditions, distribution laws and controlling factors were clarified in this paper. A new viewpoint was provided that the remaining oil reserves in fluvial facies sandstone reservoir with high heterogeneous and water-cut were mostly enriched in point bar micro facies of the main facies, not in subordinate facies that was thought before. Fifth, good economic and social benefit have been got by utilizing the methodology and technology presented in this paper about the distribution and prediction of the remaining oil. The fruits of the study were verified to be effective, helpful and advanced.