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 betw

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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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[0036] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, whereby the practitioners of the present invention can fully understand how the present invention applies technical means to solve technical problems, and achieve the realization process of technical effects and according to the above realization process The present invention is specifically implemented. It should be noted that, as long as there is no conflict, each embodiment of the present invention and each feature of each embodiment can be combined with each other, and the formed technical solutions all fall within the protection scope of the present invention.

[0037] In the prior art, Archie's formula is usually used to determine the formation factor. However, in recent years, with the increase of petrophysical experimental research on tight sandstone, a large number of experimental data show that the relationship between the strati...

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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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