Architecture Of Meandeing River Point Par, The Displacement Experiment And Analyse Of Residual Oil

Now many oil fields have went into high water-cut period. Especially the Daqing oil field has went into later development stage of extra-high water-cut period. The distribution of remaining oil in space is highly scattered. How remaining oil was produced has become a great difficult problem of increasing recovery efficiency. The point bar of meandering stream channel accounted for a substantial proportion of reservoirs with containing remaining oil. Many problems, including distribution of internal filtration field, distribution mechanism of remaining oil and producing approaches, are great topics of development geologist. Although many experts domestic and abroad have carried out relevant study from outcrop, modern fluvial sediment and fine dissecting underground monosandstone, but, they haven't completely revealed control of internal architecture of the point bar to field of filtration and how distribution mechanism of remaining oil was affected so far.On the basis of domestic and abroad research and technical literature and results of study, considering of Pâ… 3 3 meandering stream sedimentary reservoirs in Xing6 areas of southern of Daqing oilfield, applying horizontal well and logging information of close-space-wells, the divisibility of Pâ… 33 was demonstrated and further subdivided two sedimentary units(Pâ… 33a, Pâ… 3 3b ). At the same time, internal architecture of the point bar in Pâ… 33a was fine dissected and 3D property modeling of the point bar sand was built. Referred to classic theoretic model, combined internal architecture model of the point bar in the study area, and based on sedimentary dynamics, two physical models and relevant methods of displacement experiment were developed. the internal architecture of point bar in meandering stream channel and its control to the heterogeneity of reservoirs was systematically analyzed. Then 3D distribution model of filtration field was proposed.Four control models about formation and distribution of remaining oil were scientific demonstrated and summarized, and its producing approaches were proposed. The self-innovative technologies mainly are: the recognized methods of single point bar of meandering stream channel and extracted technologies of its relevant parameters; Based on sedimentary dynamics, development of two physical models and relevant methods of displacement experiment; swept height of injecting material is 1.3/3 of reservoirs, it parallel to lateral direction and is step-shaped; combined fine dissection of internal architecture of the point bar in with experimental results, systematically demonstrated distribution characteristics of filtration field in development in the point bar, and 3D distribution model of filtration field in the point bar was proposed; the proposal of internal architecture of the point bar controlling formation and distribution model of remaining oil.The outcomes of this text demonstrated it, which internal architecture of monosandstone have important controlling action to the heterogeneity of reservoirs, and remaining oil mainly distribute the middle and upper of reservoirs, because of the architecture of internal interlayer in space, the steric change of permeability in single lateral bedding, the choking of 3-level interface and so on. The outcome of this text provided full geological references for exploration of remaining oil in the point bar of meandering stream channel and had geological direction to selection of producing methods. At the same time, the outcome of this text can play an important role for further study of numerical simulation of the point bar reservoirs.