Characteristics Of Reservoir Discription And Remaining Oil Distribution Of Du 84 Fault Block, Shu 1 Area, Western Sag Of Liaohe Depression

This thesis makes profound study of fine reservoir description and remaining oil distribution of block Du 84 by using multi-disciplinary theory and techniques, which contributes to remaining oil evaluation and oil recovery enhancement of the block in future.The main topics of this thesis are as follows. Firstly, we discussed tectonic background, sedimentary evolution, fluid property and fracture characteristics of block Du 84 by using the information of seismic, logging, geological and dynamic production data; secondly, we subdivided this reservoir into small layers and carried on strata correlation, described the characteristics of microfacies and sedimentary facies, analyzed the sedimentary characteristics and heterogeneity of the reservoir; at last, we verified the characteristics and regularity of the block by making use of the method of flow unit division, reservoir simulation technology combined with the oilfield dynamic data, then we know the distribution of remaining oil.Main research methods include geological method, geophysical method, reservoir physical method and reservoir numerical simulation method.Through this research, we know that there are two macro controlling factors for the formation and distribution of the remaining oil in this block. One is reservoir heterogeneity and the other is exploitation heterogeneity. Reservoir heterogeneity includes structure heterogeneity, flow unit heterogeneity and fluid heterogeneity. Flow unit heterogeneity, the most important geological controlling factor for remaining oil distribution, is one kind of areal heterogeneity which is caused by the size, geometric shape, continuity of the flow unit and the variation of the porosity and permeability. Exploitation heterogeneity, the external control factor for the remaining oil distribution, is caused by multiple combination of layer systems, arrangement of wells, perforation positions, injection-production homology and its intensity.This study found that the recoverable reserves of most wells are more than 10,000 tons each. High yielding wells are mainly distribute in the northeast of block Du 84.