Method for correcting electrical experiment parameter m and n of undersaturated core

An experimental and core technology, applied in electrical digital data processing, special data processing applications, measuring devices, etc., can solve problems such as the increase of the cementation index m value and the decrease of the saturation index n value, and achieve the effect of obvious correction effect.

Inactive Publication Date: 2009-02-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0007] The purpose of the present invention is in order to solve the low porosity and low permeability rock core under the undersaturated state to carry out experiment and calculation according to " rock resistivity parameter laboratory measurement and calculati

Method used

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  • Method for correcting electrical experiment parameter m and n of undersaturated core
  • Method for correcting electrical experiment parameter m and n of undersaturated core
  • Method for correcting electrical experiment parameter m and n of undersaturated core

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Embodiment Construction

[0023] Select 13 core samples (porosity between 4% and 18%) in the undersaturated state (core water saturation S w Under the condition of 85%~98%), the experiment and calculation are carried out according to the standard procedure of "Laboratory Measurement and Calculation Method of Rock Resistivity Parameters (SY / T 5385-1991)", and the cementation index in the undersaturated state is obtained respectively m' value and saturation index n' value.

[0024] The correcting formulas provided by the present invention are used to correct the rock electric experiment parameters m' and n' in the undersaturated state, so as to obtain the real cementation index m and saturation index n of the rock.

[0025] Using the Archie saturation model formula, substituting the m′ and n′ calculated under the undersaturated state into the Archie saturation model formula, and calculating the water saturation S of the core under the undersaturated state w '.

[0026] Using the Archie saturation model...

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Abstract

The present invention relates to a correction method of experiment parameters m and n of rock electricity of the unsaturated low-porosity low-permeability rock core. When the rock core is unsaturated, the experiment and the calculation are completed according to the standard process of the Rock Resistivity Laboratory Parameters Measurement and Calculation Method(SY/T 5385-1991), to acquire the values of the saturation index n' and the cementation index m' of the unsaturated rock core; the correction formula (1) is adopted to calculate the value of the saturation index n of the saturated rock core; the correction formula (2) is adopted to calculate the value of the cementation index m of the saturated rock core; n is equal to n' plus (lg(R0/R0'))/lg(Mu)(1); m is equal to m' minus (lg(R0/R0'))/lg(Phi)(2); the values of the corrected cementation index m and the corrected saturation index n are closer to the real values of the cementation index m and the saturation index n of the rock core; and the correction effects are more obvious.

Description

technical field [0001] The invention relates to a method for correcting rock electric experiment parameters m and n of low porosity and low permeability rock cores in an undersaturated state. Background technique [0002] Lithoelectric experiments firstly require the core to be fully saturated with formation water. However, for low porosity and low permeability cores, due to the limitation of experimental methods, experimental equipment and experimental period, the cores often cannot be completely saturated, and the experiment can only be performed under certain conditions. approximation, so there will be some error. [0003] Among these errors, core undersaturation is one of them, which has a significant impact on the experimental measurement results of formation factor F and resistance increase rate I, and then affects the calculation of saturation index n and cementation index m. Especially for the cores of low-porosity and low-permeability formations, if they cannot be ...

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Application Information

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IPC IPC(8): G01N27/04G01N33/00G06F19/00
Inventor 万金彬杜环虹孙宝佃李新罗燕颖
Owner BC P INC CHINA NAT PETROLEUM CORP
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