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Formation fluid saturation degree evaluating method

A technology of formation fluid and evaluation method, applied in the field of well logging exploration, can solve problems such as difficult evaluation of reservoir oil and gas content, leakage of oil and gas layers, waste of production costs, etc.

Inactive Publication Date: 2008-03-05
CHINA UNIV OF PETROLEUM (BEIJING)
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AI Technical Summary

Problems solved by technology

The non-Archie phenomenon is a very important phenomenon, which has a crucial impact on the quantitative evaluation of the oil and gas content of the reservoir. The existence of the non-Archie phenomenon makes it difficult to use the Archie formula to accurately evaluate the oil and gas content of the reservoir.
For example, for reservoirs with the first type of non-Archie phenomenon, if the Archie formula is used to evaluate the oil and gas content, the interpretation result of the oil and gas saturation under the same conditions will be low, which will cause many oil and gas layers to be For the reservoirs with the second non-Archie phenomenon, if the Archie formula is used to evaluate the oil and gas content, the interpretation result of the oil and gas saturation under the same conditions will be higher, so that some low-production oil layers will be misunderstood. Think high-yielding reservoirs, resulting in waste of production costs

Method used

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Experimental program
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Effect test

Embodiment 1

[0083] Firstly, the resistivity data Ro of the core is obtained when the core is completely saturated with water by rock electric experiment measurement, and then the resistivity data Rt of the core at different water saturations (Sw, and Sw+So=1) is obtained, and the value of Rt and Ro is used Ratio calculates the resistivity increase coefficient I, in order to make the applicable effect of the present invention better, when measuring, the distribution range of saturation should obtain wider, can be about 0.1 and should carry out corresponding measurement when water saturation.

[0084] For example: take a piece of core, its shale content Vsh=0, porosity φ=0.09.

[0085] The resistivity when it is fully saturated with water is measured as:

[0086] Ro=147.5Ω.m

[0087] Then according to the resistivity data Rt of the rock core at different water saturations (Sw, and Sw+So=1), the ratio of Rt and Ro is used to calculate the resistivity increase coefficient I, and table 2 is t...

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Abstract

The method uses the relational model between the rock and the electricity to evaluate the saturation of the stratum fluid. In the method, I is a resistivity augmenting factor; R0 is a resistivity when the stratum contents 100% water, it unit is ohm.m; Rt is a stratum resistivity, its unit is ohm.m; SW is a water saturation of stratum; Phi is porosity; Vsh is shale content; U is wettability index; Y is parameter; C is constant.

Description

technical field [0001] The invention relates to well logging exploration technology, in particular to a method for evaluating formation fluid saturation, specifically a method for quantitatively evaluating the oil and gas content of reservoirs by using well logging data. Background technique [0002] Oil is an important strategic resource. From an economic and technical point of view, whether it is foreign cooperation, purchasing foreign oil fields through international bidding, or conducting domestic exploration to find new oil and gas areas and re-evaluating old oil fields, reservoir reserve evaluation is an important key technology to improve Reserve evaluation technology is of great significance not only for the development of national economy, but also for the reasonable determination of oil reserves. [0003] The reserve evaluation of the reservoir mainly refers to the quantitative evaluation of the oil-gas content of the reservoir, and it is an important method to us...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 岳文正陶果
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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