Numerical simulation method of fractured-vug carbonate reservoir

Abstract

The invention provides a numerical simulation method of a fractured-vug carbonate reservoir and belongs to the field of oil-gas field development. The method includes: 1, judging whether a representative region of the fractured-vug reservoir has fractures and caves; if not, performing single-pore medium numerical simulation to obtain a mathematical model, and going to the step 6; if yes, going to the step 2; 2, setting dimensional limits l<v1>, l<v2>, l<f1> and l<f2> of intra-medium fractures and caves of the fractured-vug reservoir; 3, according to the determined dimensional limits, dividing a medium region of the fractured-vug reservoir into small-size fractures, medium-size fractures, large-size fractures, small-size caves, medium-size caves and large-size caves according to the fractured-vug sizes l<v> and l<f>; 4, according to medium modelling rules of the fractured-vug reservoir and experimental results of representative elementary volumes, judging whether the representative elementary volumes REV<f> and REV<v> exit; if yes, going to the step 5, and if not, returning to the step 2.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a numerical simulation method for a fractured-vug carbonate reservoir. Background technique [0002] Reservoir numerical simulation technology research began in the 1930s, was applied in the petroleum industry in the 1950s, and entered the commercialization stage in the 1970s. In the 1980s, the numerical simulation of oil reservoirs became more perfect, supporting, and large-scale multi-functional integration. In the 1990s, the reservoir numerical simulation technology was further improved, the dual-media reservoir numerical simulation technology was developed, and it was developed into a large-scale integrated software. In the 21st century, the development of reservoir numerical simulation tended to be more The description is more accurate, the calculation speed is faster, and the calculation results are more accurate. The multi-media model is further dev...

AI Technical Summary

Problems solved by technology

However, the numerical simulation of fracture-vuggy reservoirs has become a huge challenge for petroleum engineers, which has seriously restricted the efficient development of such reservoirs;

[0006] 2) The multi-media model cannot accurately simulate the larger fractures that control the fluid flow direction and scale in the reservoir, nor can it accurately simulate the fluid flow in large caves;

Fractured-cavity reservoirs have complex media types (including matrix, dissolved pores, dissolved caves, fractures, etc.), large scale changes (including voids of different scales, and the inner diameter of large dissolved caves can reach tens of meters; there are also fractures of different scales, The fracture opening not only exists in the micron level, but also in the centimeter level), and the flow types are diverse (including Darcy seepage, high-speed Darcy seepage, underground free flow, pipe flow, etc.), and the current research is still blank

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