Method for quickly detecting saturation exponent n in laboratory

A technology of saturation and measurement method, which is applied in the field of rapid determination of reservoir saturation index n in the laboratory, and can solve problems such as non-compliance and long test period

A technology of saturation and measurement method, which is applied in the field of rapid determination of reservoir saturation index n in the laboratory, and can solve problems such as non-compliance and long test period

CN102243196AActive Publication Date: 2011-11-16CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Method for quickly detecting saturation exponent n in laboratory
  • Method for quickly detecting saturation exponent n in laboratory
  • Method for quickly detecting saturation exponent n in laboratory

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Embodiment Construction

[0058] The technical way to specifically realize the purpose of the invention is to reduce the number of rock core saturation controls, and shorten the time for capillary force and resistivity balance. Main technical basis: 1) If you want to judge whether the relationship between rock resistance increase rate and water saturation follows the Archie relationship, you can observe the relationship between the resistance increase rate and water saturation by only measuring the resistivity of the core in three uniformly distributed saturation states. Whether there is a "linear" relationship between the water saturation; 2) When the water saturation of the core is 100%, there is only a single-phase fluid in the pores—brine, and the capillary pressure and resistivity are stable; the irreducible water saturation Swi, residual oil and gas saturation The Sor state corresponds to the brine state and the non-flowing state of oil and gas, respectively, and the capillary pressure and resisti...

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Abstract

The invention provides a method (three-point method) for quickly detecting a saturation exponent n in a laboratory. The method realizes the following three particular targets: (1) on the premise that capillary force and resistivity balance are ensured, the water saturation and resistivity of a core can be measured accurately; (2) the experiment testing period is shortened to 2 weeks from 2 months; and (3) whether the relationship between the resistance increase and the water saturation of rock conforms to the Archie relationship or not can be judged, and the saturation exponent n is given if the relationship between the resistance increase and the water saturation of rock conforms to the Archie relationship. The three-point method can efficiently detect reservoir saturation without risk.

Description

technical field [0001] The invention relates to a method for measuring rock electrical parameters in the field of exploration geophysics, in particular to a method for quickly measuring reservoir saturation index n in a laboratory. Background technique [0002] Archie established the resistivity increase rate (R I ) and water saturation (Sw) and formation factors (F F ) and porosity (φ), namely the Archie formula: [0003] R I =Rt / Ro=1 / S n W (1) [0004] f F = R 0 / Rw=1 / φ m (2) [0005] In the formula, Rt is the true resistivity of the core saturated with formation water and hydrocarbons, Ro is the resistivity of fully water-bearing sandstone, Rw is the resistivity of formation water, m is the cementation index, and n is the saturation index. Archie's formula establishes a link between porosity measurement and resistivity measurement, and constitutes the theoretical basis for quantitatively evaluating the original oil (gas) saturation of "pure formations" u...

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Application Information

Patent Timeline
16 Nov 2011
Publication
CN102243196A
IPC
G01N27/04
Inventors
韩学辉; 李峰弼