Equivalent characterization method for reservoir stratum cause unit interface

Abstract

The invention discloses an equivalent characterization method for a reservoir stratum cause unit interface. The equivalent characterization method comprises the specific step of tracking a three-dimensional geologic model sand body cause unit interface based on three-well-point data constraint: combining well-point explanation data to smooth sedimentary microfacies data in a three-dimensional geologic model by adopting a low-pass filtering algorithm, tracking cause units, namely the spatial position of each microfacies interface on the basis, and forming three-dimensional spatial dispersion data of an architecture interface. According to the equivalent characterization method, the influence of the grid conductivity equivalent characterization low-seepage architecture interface between the reservoir stratum cause units on the seepage effect is utilized, and the grid conductivity between the reservoir stratum cause units is adjusted, so that the aim that the low-seepage architecture interface is set in numerical reservoir simulation is achieved, the value of the conductivity equivalently characterizes the influence of the architecture interface on the seepage effect, and the obvious effects are achieved for oil field efficient development and remaining oil prediction.

Description

technical field [0001] The invention relates to a quantitative characterization method for the interface of a small-scale genetic unit inside a reservoir. Background technique [0002] Reservoir 3D geological modeling technology and reservoir numerical simulation technology play an important role in supporting the efficient development of oil fields. Require. [0003] When conducting more detailed research on reservoirs, the influence of low-permeability interfaces inside reservoirs on fluid seepage and remaining oil distribution in reservoirs has gradually been paid attention to. Scholars at home and abroad have proposed the concept of architecture to describe reservoir Genetic units of different levels within a stratum. It is also found in the practice of oilfield development that the low-permeability configuration interface inside the reservoir has an important influence on the fluid movement inside the reservoir. However, when performing 3D geological modeling, due to...

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Problems solved by technology

However, when performing 3D geological modeling, due to the large differences in the distribution scale, distribution continuity, and physical properties of configuration interfaces at different scales, there is currently no mature technical solution for describing configurations at various levels. interface

[0004] Deterministic methods can still be used to describe large-scale subsurface reservoir interfaces (such as flood surfaces, etc.), but for small-scale interfaces with unstable distribution (such as point bar lateral accretion beds of fluvial reservoirs, etc.) It is more difficult to realize, if it is described by a fine grid model, it will inevitably result in a huge number of grids in the geological model, and it is difficult to retain when the reservoir numerical simulation model is coarsened.

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