Study On Remaining Oil Distribution And Development Adjustment Scheme In The Second Section Of The Second Stage Oilfield Ⅰ Fault Block

H2section of Fault block I in Xiaermen oilfield is a layered reservoir with gas cap gas. The high part of structure is gas, the outer-ring is oil, and the low part is water. The distribution of oil/gas/water in Group Ⅰ and Ⅱ of H2is complex, and the energy of edge water is strong, so the migration of oil/gas/water is complicated during waterflooding. In addition, heterogeneity of the reservoir is severe. All of these lead to bad effect of development. This paper uses3D geologic modeling and numerical simulation methods to study the law of remaining oil distribution and characteristic of waterflooding, which provides the support for the efficient development plan and enhanced oil recovery.In this paper, according to the geological and well logging data of fault block I in H2section, the deterministic modeling method is applied to build tectonic model. On the basis of well attribute, random function and Sequential Gaussian Simulation method which is stable on arithmetic is used to build the attribute (permeability, porosity) model. Parameter comparison and vacuate test are used to verify the geological model to obtain the reasonable model. Combined with the reservoir physical property parameters and production performance data, a reservoir numerical model is built. The remaining oil saturation distribution maps and the reserves abundance distribution maps of the nine simulation layers is acquired through the high precision history matching of geological reserves, oil production, water cut etc. The influencing factors for remaining oil distribution of every layer are studied from geological and development aspects. Distribution control type and distribution characteristics of remaining oil in horizontal and vertical direction are analyzed in macroscopic perspective. Remaining oil of specific type in horizontal direction is counted quantitatively in microscopic perspective. Meanwhile, waterflooding thickness, waterflooding area, and waterflooding reserves of every layer are calculated according to the water saturation data. Waterflooding situation and remaining oil potential are further analyzed.Aimed at the strong interlayer contradictions, according to the principle of similar reservoir property, similar development situation and similar countermeasures, and better superimposition, the development unit is redesigned. It is divided into four units, and adjusted carefully. On the basis of characteristics of remaining oil distribution and waterflooding, several schemes for remaining oil recovery are proposed. Combined with rational well spacing and new well’s recoverable reserves within economic limit, three development schemes of adjustment are designed. Numerical simulation methods are used to calculate the rational length and the liquid output of horizontal well. Finally, according to the simulative development indices of different schemes, Scheme F4is the best one. Its oil recovery is35.07%, which is31.03%greater than that in standard scheme, and its effect of development is best.