A Method for Selecting Physical Model of Carbonate Reservoir

Abstract

The invention provides a carbonate reservoir physical model selection method. The method provided by the invention comprises the steps of: firstly, carrying out a physical simulation test on each double-phase medium model in different frequency ranges and under different permeability ratios to obtain a first test result; then carrying out a physical test on a carbonate reservoir to obtain a secondtest result, and according to the second test result, carrying out partitioning on a reservoir category of the carbonate reservoir; and finally, according to the first test result and the reservoir category, selecting an optimal double-phase medium model for the carbonate reservoir. The carbonate reservoir physical model selection method has the beneficial effects that a carbonate reservoir rockphysical model selection means is given out according to the reservoir category of the carbonate reservoir, and a selection method of rock physical models for different types of reservoirs on different frequency bands are optimized.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a method for selecting a physical model of a carbonate reservoir. Background technique [0002] With the development of oil and gas geology and geophysical exploration technology and the maturity of oil and gas field development technology, the objects of reservoir exploration and development have gradually expanded from conventional reservoirs to more complex lithologic reservoirs. The diversity of reservoir types makes reservoir numerical simulation increasingly difficult. Underground rock is a two-phase medium composed of porous rock solid matrix and pore fluid, containing various mineral components, pores of different shapes and sizes, and fluids of different properties filled in the pores, which has the characteristics of heterogeneity; The rock skeleton composed of pores can be homogeneous or heterogeneous relative to the wavelength. When elastic waves propagate in th...

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Problems solved by technology

[0003] At present, some fluid-solid dual-phase medium rock physics models have been applied to reservoir physical simulation. The applicability conditions of these models are very different and the derivation process is complicated. For carbonate formations with strong heterogeneity, rock physics The difference in properties makes it very difficult to choose a petrophysical model that is more in line with the characteristics of actual oil and gas reservoirs; in addition, the acoustic dispersion and attenuation characteristics of different frequencies have an important impact on the effectiveness of reservoir prediction. Physical and experimental test data (seismic data is 10 1 ~10 2 Hz; logging data is 10 4 Hz; Ultrasonic test data is 10 5 ~10 7 Hz) in the process of reservoir rock physics simulation, it is very difficult to optimize the rock physics model related to frequency

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