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Method and device for obtaining transverse relaxation time distribution of target storage layer

A technology of lateral relaxation and time distribution, which is applied in the detection of electric/magnetic for well logging, analysis by nuclear magnetic resonance, climate sustainability, etc. It can solve the problems of inaccurate reservoir evaluation and other problems

Active Publication Date: 2015-02-04
PETROCHINA CO LTD
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Problems solved by technology

At present, the main method of using NMR technology to obtain reservoir oil and gas pore size distribution information is to set the NMR transverse relaxation time T 2 The distribution is converted to a pore size distribution and must be the NMR transverse relaxation time T in the fully hydrated state 2 distribution can accurately obtain the pore size distribution information, but the direct use of free water NMR transverse relaxation time T 2 distribution, ignoring the fact that oil and gas in the actual reservoir will interact with T 2 The influence of the distribution makes it possible to obtain the NMR transverse relaxation time T 2 Distribution cannot be used for accurate reservoir evaluation

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  • Method and device for obtaining transverse relaxation time distribution of target storage layer
  • Method and device for obtaining transverse relaxation time distribution of target storage layer
  • Method and device for obtaining transverse relaxation time distribution of target storage layer

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[0037] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described The embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

[0038] In the prior art, in order to obtain the NMR transverse relaxation time T in a completely hydrated state 2 Distribution, for accurate reservoir evaluation, free water nuclear magnetic resonance transverse relaxation time T can be used 2 Distribution, but ignoring that the oil and gas in the actual reservoir will affect the NMR lateral relaxation t...

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Abstract

The embodiment of the invention provides a method and a device for obtaining transverse relaxation time distribution of a target storage layer. The method comprises the steps of setting corresponding experiment temperature and pressure according to temperature and pressure information of the target storage layer, and obtaining nuclear magnetic resonance intrinsic transverse relaxation time distribution of free state formation water of the target storage layer, nuclear magnetic resonance intrinsic transverse relaxation time distribution of crude oil of the target storage layer and nuclear magnetic resonance intrinsic transverse relaxation time distribution of formation water of the target storage layer; and calculating a hydrogen-containing index of the crude oil, a hydrogen-containing index of formation water, a diffusion coefficient of the crude oil and a diffusion coefficient of the formation water, then replacing intrinsic relaxation and diffusion relaxation comprehensive contribution of the crude oil by intrinsic relaxation and diffusion relaxation comprehensive contribution of the free state formation water, acquiring a rotating echo signal of the target storage layer under a complete water containing state, and performing inversion on the rotating echo signal to obtain the nuclear magnetic resonance transverse relaxation time distribution of the target storage layer under the complete water containing state.

Description

Technical field [0001] The invention relates to the technical field of petroleum well logging, in particular to a method and a device for obtaining the lateral relaxation time distribution of a target reservoir. Background technique [0002] In the field of petroleum logging technology, nuclear magnetic resonance technology has been widely used, and nuclear magnetic resonance technology is an effective means to determine the distribution of oil and gas pore size of reservoirs and to achieve quantitative evaluation of complex reservoirs. At present, the main method of using nuclear magnetic resonance technology to obtain reservoir oil and gas pore size distribution information is to use the transverse relaxation time of nuclear magnetic resonance T 2 The distribution is converted to the pore size distribution, and it must be the NMR transverse relaxation time T in a completely hydrated state 2 The pore size distribution information can only be obtained accurately through the distri...

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Application Information

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IPC IPC(8): G01N24/08G01V3/32
CPCY02A90/30
Inventor 胡法龙周灿灿李潮流王成蔚徐红军王昌学李长喜
Owner PETROCHINA CO LTD
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