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Method of obtaining tight sandstone stratum factors

A technology of formation factors and rock samples, which is applied in earth cube drilling, special data processing applications, instruments, etc., can solve problems such as the unsatisfactory correlation with Archie's formula, etc., and achieve the effect of simple and practical operation and good application effect

Active Publication Date: 2018-03-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, in recent years, with the increase of petrophysical experimental research on tight sandstone, a large number of experimental data show that: under the log-logarithmic coordinates, the relationship between formation factors and porosity of tight sandstone is not ideally in line with the Archie formula
Whether Archie's formula is suitable for logging interpretation of tight sandstone reservoirs is controversial

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  • Method of obtaining tight sandstone stratum factors
  • Method of obtaining tight sandstone stratum factors
  • Method of obtaining tight sandstone stratum factors

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Embodiment Construction

[0036] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so that implementers of the present invention can fully understand how the present invention uses technical means to solve technical problems, and achieve the realization process of technical effects and according to the above-mentioned realization process The present invention is implemented concretely. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0037] In the prior art, Archie's formula is usually used to determine formation factors. However, in recent years, with the increase of petrophysical experimental research on tight sandstone, a large number of experimental data show that: under the log-logarithmic coordin...

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Abstract

The invention discloses a method of obtaining tight sandstone stratum factors. The method comprises the steps of determining a mathematic model among an Archie formula calculation value, measured dataand irreducible water saturation of a rock sample of which porosity is smaller than a porosity threshold value based on experiment data; correcting the Archie formula calculation value of a measuringtarget of which porosity is smaller than a porosity threshold value based on the mathematic model according to logging information to obtain the stratum factors of the measuring target. The method and procedure obtaining the stratum factors based on the irreducible water saturation are established for the difficulty of obtaining the stratum factors in tight sandstone logging interpretation. Compared with the prior art, the method is easy to operate and practical and has a good application effect in actual logging interpretation.

Description

technical field [0001] The invention relates to the field of geological development, in particular to a method for obtaining factors of tight sandstone formations. Background technique [0002] Determining formation factors is an important content in saturation evaluation of petroleum logging interpretation. For a long time, the formation factors have been determined using the results published by American logging engineer G.E.Archie in 1942 (called Archie’s formula). G.E.Archie found through the analysis of a large number of rock-electricity experiment data: under the double-logarithmic coordinates, “pure” sandstone Formation factors have a linear relationship with porosity, expressed as the following formula: [0003] [0004] Among them: F is formation factor, dimensionless; R 0 is the resistivity of the rock sample when it contains 100% water, ohm m; R w is the pore water resistivity, ohm m; φ is the rock porosity, decimal; a, m are constants related to rock proper...

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Application Information

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IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 张军李军刘志远苏俊磊南泽宇王晓畅胡瑶
Owner CHINA PETROLEUM & CHEM CORP
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