Stratum anisotropy information extracting and correcting method and system

An anisotropy and correction method technology, applied in earthwork drilling, wellbore/well components, etc., can solve problems such as inaccurate anisotropy information

Active Publication Date: 2015-07-15
CHINA NAT OFFSHORE OIL CORP +1
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[0006] 3) When there are errors in the inversion of the array induction measurement data, it will directly lead to inaccu

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  • Stratum anisotropy information extracting and correcting method and system
  • Stratum anisotropy information extracting and correcting method and system
  • Stratum anisotropy information extracting and correcting method and system

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[0170] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention.

[0171] The array laterolog tool has four different backflow modes, and can detect four different radial detection depth measurement curves, and formation anisotropy information, namely vertical resistivity and horizontal resistivity, influences the four detection modes There are certain differences, the shallower the detection mode is, the more seriously it is affected by the anisotropy of the formation, and the anisotropy information of the formation can be extracted according to this difference. Therefore, we propose a method of extracting formation anisotropy information and correcting it only through the measured data of the array laterolog tool, which can not only reduce the complexity of program design, but also obtain ...

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Abstract

The invention provides a stratum anisotropy information extracting and correcting method and system. The method comprises the following steps that an array lateral logging response chart and an anisotropy correcting chart are built through a plurality of different stratum models in a simulation way; four apparent resistivity curves of different radial detecting depths are obtained through underground measuring data measured by an underground array lateral logging instrument; the storehouse checking inversion is carried out by adopting the obtained apparent resistivity and the built logging response chart, and the stratum horizontal resistivity and the anisotropy coefficient are extracted; the stratum vertical resistivity is calculated according to the extracted stratum horizontal resistivity and the anisotropy coefficient; the apparent resistivity curves of different radial detecting depths are respectively corrected according to the extracted anisotropy coefficient and the built anisotropy correcting chart, and four corrected apparent resistivity curves are obtained. The method and the system adopting the scheme have the advantages that the complexity of the program design can be reduced, more precise stratum resistivity information is obtained, and the evaluation precision of oil and gas saturability is improved.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method and system for extracting and correcting formation anisotropy information. Background technique [0002] In actual logging, many reservoir rocks show resistivity anisotropy, especially in oil-saturated reservoirs. Resistivity anisotropy is one of the specific manifestations of formation anisotropy, that is, the vertical resistivity of the formation is different from the horizontal resistivity. The anisotropy of resistivity is caused by the inconsistency between horizontal resistivity and vertical resistivity caused by stratum thickness less than measuring instrument resolution or stratum inclination. The formation resistivity used in conventional wireline logging evaluation usually refers to the horizontal resistivity, but lateral logging has a certain sensitivity to the vertical component of formation resistivity. The well curve will deviate from the hor...

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 张志刚马欢波张全文张中庆
Owner CHINA NAT OFFSHORE OIL CORP
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