| Our research area is located in east of the intermediate belt of the north wing of anticlinal structure which is in the north of Saertu development area of Daqing placanticline. Over a long period of development, the remaining oil is characterized by worse perporities. By means of fine geologic modeling, reservoir description, simulation of reservoir, established a geological model , determined the distribution of oil saturation, analyzed the factors of controlling the distribution of remaining oil, confirmed the division scheme of layer system and technical limits of layer system combination, and Carried out the rearch of rational spacing between wells.Saertu and Putaohua oil layers is dominated by river-delta, consisting of distributary channel, abandoned channel, crevasse splay, subsea distributary channel, mouth bar, sand sheet. By research of reservoir heterogeneity, we make clear that the reservoir is non-homogenous. We establish geological model, including establishing sand skeleton model, porosity model and permeability model, and then on the basis of numerical simulation of the study area, we make clear that the controlling factors of the distribution of remaining oil is geologic factor and development factor.On the basis of the principle of layer system complementation divide Saertu and Putaohua oil layers into three layer systems: PI and PII, S I～SII 9, SII10+11a～SIII. Found by numerical simulation: when compositing the layers in the single well, we should control permeability contrast within the range of 3.On this basis, reperforate 10 production wells and 7 injection wells, development index display: development effect is better after layer system complementation.Meanwhile, use several methods about rational spacing between wells in experimental area, providing the rational spacing between wells in our study area is 159m, the rational spacing between wells of main layer is 157-164m, the rational spacing between wells of poor layer is 162-168m. |
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