Method for constructing pseudo nuclear magnetic T2 spectrum by using conventional logging data

A conventional logging data and nuclear magnetic technology, applied in the field of constructing pseudo nuclear magnetic T2 spectrum, can solve the problems of expensive nuclear magnetic logging and inability to accurately evaluate pore structure parameters, etc.

Active Publication Date: 2011-05-04
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

Therefore, conventional logging technology cannot accurately evaluate pore structure parameters, and nucl

Method used

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  • Method for constructing pseudo nuclear magnetic T2 spectrum by using conventional logging data
  • Method for constructing pseudo nuclear magnetic T2 spectrum by using conventional logging data
  • Method for constructing pseudo nuclear magnetic T2 spectrum by using conventional logging data

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Embodiment Construction

[0038] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 shown in the process.

[0040] The first step is to optimize the sample layer:

[0041] The selection of the sample layer is based on the following principles:

[0042] a. The conventional logging data of the sample layer can truly reflect the formation information;

[0043] b. The sample layer covers different types of formations;

[0044] c. The sample layer data does not contain oil and gas information.

[0045] Such as figure 2 Shown is the conventional logging curve and NMR logging T of the sample layer 2 Spectrum. NMR logging T 2 Spectral response characteristics are obvious, and the mudstone layer T 2 The main peak of the spectrum is mainly concentrated before 30 milliseconds, and the pure water layer T 2 The spectrum amplitude is large and the main peak is after 30 milliseconds, the dry interval T 2...

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Abstract

The invention discloses a method for constructing a pseudo nuclear magnetic T2 spectrum by using conventional logging data, which solves the technical problems that the conventional logging technology cannot accurately evaluate hole structure parameters and the nuclear magnetic logging price is high. The method comprises the following steps of: splitting two-dimensional information of a nuclear magnetic T2 spectrum for reflecting a hole structure into one-dimensional information according to the composition, establishing an empirical relationship between the one-dimensional information and the conventional logging data, and then assembling the one-dimensional information and the conventional logging data into corresponding two-dimensional information so as to realize transformation of the logging data from the one-dimensional information to the two-dimensional information, namely construct the two-dimensional nuclear magnetic logging T2 spectrum by using the one-dimensional conventional logging data. The method has remarkable actual application effect; the pseudo nuclear magnetic logging T2 spectrum is remarkably similar to the actually measured nuclear magnetic logging T2 spectrum on morphology, succeeds the advantage that the resolution rate of the conventional logging technology is higher than that of the nuclear magnetic resonance technology, and can evaluate the physical property of a reservoir, evaluate the hole structure of the reservoir and perform comprehensive evaluation of the complex reservoir as the actually measured nuclear magnetic T2 spectrum; and the method has great popularization value.

Description

technical field [0001] The invention relates to a comprehensive evaluation method used in the field of well logging, in particular to a method for constructing pseudo nuclear magnetic T 2 spectrum method. Background technique [0002] NMR logging is the only contemporary logging method that can directly measure the free fluid porosity of reservoirs (oil layers, gas layers, water layers). The measurement results are less affected by mud, mud cake and intrusion, and will not destroy the dynamic balance and pore structure, and can provide porosity independent of rock lithology, water saturation, pore size distribution, and permeability independent of formation water fluid salinity It is intuitive and easy to understand, and it is a valuable logging method. The nuclear magnetic resonance logging technology has realized the advancement of petrophysical analysis from the laboratory to the drilling site, and extended the analysis object to cuttings, which has the characteristics ...

Claims

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Application Information

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IPC IPC(8): E21B49/00G01V3/32G01V3/38
Inventor 张晋言孙建孟张德峰
Owner CHINA PETROCHEMICAL CORP
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