Method for determining stratum water saturation

A technology of water saturation and formation, which is applied in earth-moving drilling, wellbore/well components, etc., can solve problems such as errors and large changes in reservoir water saturation, and achieve accurate calculation results and good application effects.
CN101649738AInactive Publication Date: 2010-02-17BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2010-02-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to petroleum well-logging technology, in particular to a method for determining stratum water saturation. The method comprises the following steps: selecting a serial core of geologic feature; obtaining porosity Phi of the core and saturated core stratum water specific resistance Rw; and solving and substituting cementation index m(Rw, Phi) and saturation index n(Rw, Phi) ina common Archie water saturation computation model to calculate accurate stratum water saturation Sw. The method realizes corresponding change along with different physical properties of reservoir stratums and changes in stratum water specific resistance to ensure more accurate and reliable results, thereby having better application effect.
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Description

technical field

[0001] The invention relates to petroleum logging technology, in particular to a method for determining the water saturation of formations. Background technique

[0002] Accurate calculation of formation water saturation is the basis of logging formation evaluation. The most classic and commonly used method to determine formation water saturation in formation evaluation is the Archie water saturation calculation model method. This method later derived some other logging evaluation methods, and these methods were also developed on the basis of Archie's water saturation calculation model. The classic Archie water saturation interpretation model is established on the basis of pure sandstone lithoelectric experiments under the condition of high salinity solution, which is the theoretical basis for quantitative interpretation of logging data.

[0003] The classic Archie formation water saturation formula is: S w = ...

Claims

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