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Method for quantitatively evaluating saturation of complex oil and gas reservoir

A technology for quantitative evaluation of oil and gas reservoirs, which is applied in earth-moving drilling, wellbore/well components, etc., can solve problems such as the unfavorable accurate establishment of high-precision cementation index m-value models, and the inability to accurately calculate the saturation of complex oil and gas reservoirs. Achieve the effect of high precision, strong versatility and strong versatility

Active Publication Date: 2013-03-20
CHINA NAT OFFSHORE OIL CORP +1
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AI Technical Summary

Problems solved by technology

This is not conducive to the accurate establishment of the high-precision cementation index m-value model, and it is also impossible to accurately calculate the saturation of complex oil and gas reservoirs

Method used

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  • Method for quantitatively evaluating saturation of complex oil and gas reservoir
  • Method for quantitatively evaluating saturation of complex oil and gas reservoir
  • Method for quantitatively evaluating saturation of complex oil and gas reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Embodiment 1: Taking the dolomite reservoir of well A in a certain oil field as an example

[0100] 1) The formation factor F, cementation index m value and effective porosity of the dolomite reservoir in Well A of an oilfield were measured by rock electric experiment

[0101] 2) According to formula (13)

[0102]

[0103] by is the abscissa, and the effective porosity is the ordinate, and the G value of the dolomite reservoir in Well A of the oilfield is obtained by the slope of the fitting curve;

[0104] 3) According to formula (7)

[0105]

[0106] Calculate the conductive porosity of the dolomite reservoir in well A of the oilfield

[0107] 4) According to formula (14)

[0108]

[0109] Such as figure 1 As shown, the cementation index m value and effective porosity of dolomite reservoirs are established and conductive porosity difference The relationship between:

[0110]

[0111] Such as figure 2 As shown, establishing the effectiv...

Embodiment 2

[0123] Embodiment 2: Taking the limestone reservoir of well B in a certain oil field as an example

[0124] 1) The formation factor F, cementation index m value and effective porosity of the dolomite reservoir in well B of an oilfield were measured by rock electric experiment

[0125] 2) According to formula (13)

[0126]

[0127] by is the abscissa, and the effective porosity is the ordinate, and the G value of the lithology in this area is obtained by the slope of the fitting curve;

[0128] 3) According to formula (7)

[0129]

[0130] Solving for Conductive Porosity

[0131] 4) According to formula (14)

[0132]

[0133] Such as Figure 4 As shown, to establish the cementation index m value and effective porosity of limestone reservoir and conductive porosity difference The relationship between:

[0134]

[0135] Such as Figure 5 As shown, to establish the effective porosity of limestone reservoir with conductive porosity The relationsh...

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Abstract

The invention relates to a method for quantitatively evaluating saturation of a complex oil and gas reservoir. A calculation formula of a rock conductive hole porosity is deduced based on a Maxwell conduction equation; and in combination with a result of the electric petrophysical experiment of 12 rock properties, the relationship among cementation indexes and an effective porosity and a conductive hole porosity difference corresponding to the cementation index can be deduced, so that a high-precision calculation model of the cementation index in an Archie equation can be exactly established. According to the method, the relationship between the effective porosity and the conductive hole porosity is established, so that the calculation model of the cementation index can take the conductive hole porosity as a bridge to deduce a universality expression between the cementation index and the effective porosity in the Archie equation; and the method has strong universality, and can comprehensively reflect conductive mechanisms of the complex reservoir. The invention provides an effective method with high precision and strong universality for quantitatively evaluating the saturation of a complex porosity type reservoir by using the Archie equation; and the method can be widely used for quantitatively evaluating the saturation of various complex porosity type reservoirs.

Description

technical field [0001] The invention relates to a quantitative evaluation method, in particular to a quantitative evaluation method for the saturation of complex oil and gas reservoirs. Background technique [0002] The commonly used quantitative evaluation method for oil and gas reservoir saturation is established based on Archie's formula. Archie's formula includes two formulas, where, [0003] The calculation formula of formation factor F is: [0004] [0005] Where: R 0 is the formation resistivity when 100% saturated with formation water, in Ω m; R w is the resistivity of formation water, the unit is Ω m; a is the proportional coefficient related to lithology, dimensionless; is effective porosity, dimensionless; m is cementation index, dimensionless. [0006] The formula for calculating the resistance increase coefficient I is: [0007] I = R t R 0 ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 李雄炎秦瑞宝刘春成李欣蔡露露
Owner CHINA NAT OFFSHORE OIL CORP
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