Porous medium water saturation calculation method based on network simulation

Abstract

The invention relates to a porous medium water saturation calculation method based on network simulation, and the method sequentially comprises the following steps that: (1) a selected rock sample is cut into three sections, wherein an A section is used for a rock electrical experiment, a B section is used for wettability measurement, and a C section is used for cast body sheet analysis; (2) a formation factor F is calculated; (3) the normalized standard deviation Sigma r of the pock pore radius is calculated; (4) an average coordination number z is calculated; (5) a porous medium percolation network model is built and a parameter a' is calculated; (6) the number of a' is determined; and (7) water saturation Sw is calculated. According to the porous medium water saturation calculation method based on network simulation, apart from that the rock electrical experiment is carried out, the average coordination number z of the porous medium and the normalized standard deviation Sigma r of the pock pore radius need to be analyzed and calculated through capillary pressure curves and cast body sheets, and a network simulation technology is applied; and consequently, results by adopting the calculation method are more true and reliable, and bases and means are provided for the accurate and quantitative calculation of the water saturation of a reservoir stratum.

Description

technical field [0001] The present invention relates to the calculation method of rock electrical properties and rock water saturation, especially according to rock electrical experiment data and electrical logging data, which can quantitatively calculate the water saturation of oil and gas reservoirs, and is a geophysical electrical logging method. Data Interpretation Methods. Background technique [0002] Porous media widely exists in nature and human society, such as sedimentary rocks, metamorphic rocks, igneous rocks and artificial rock materials in natural rocks. A large amount of oil, gas, and water resources are stored in underground rock formations. These resources are usually detected and evaluated by geophysical methods. The most widely used method is to use electrical logging technology combined with petrophysical experiments to measure oil and gas saturation. Evaluation, this method is applied to all stages of oil and gas reservoir exploration and development. ...

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Problems solved by technology

[0020] Analyzing the existing problems of the original calculation method: the debate on Archie’s formula has a long history, and there are two main views: the first view is that Archie’s formula is just an empirical formula, which is an empirical simulation of the relationship between rock electrical properties and water saturation. Th

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