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Capillary pressure determination method and device based on nuclear magnetic test

A technology of capillary pressure and determination method, which is applied in measurement devices, analysis using nuclear magnetic resonance, instruments, etc., to achieve the effect of improving calculation accuracy and interpretation coincidence rate, solving quantitative evaluation problems, and high precision

Pending Publication Date: 2020-11-27
PETROCHINA CO LTD
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Problems solved by technology

The saturation calculation accuracy and interpretation coincidence rate are greatly improved, so as to achieve the purpose of high-precision calculation of complex reservoir saturation in conventional logging series, and effectively solve the problem of quantitative evaluation of reservoir saturation

Method used

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  • Capillary pressure determination method and device based on nuclear magnetic test
  • Capillary pressure determination method and device based on nuclear magnetic test
  • Capillary pressure determination method and device based on nuclear magnetic test

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Embodiment Construction

[0080] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0081] In view of the problem that the measurement method for capillary pressure in the prior art has poor accuracy and cannot be applied to exploration areas with few cores, an embodiment of the present invention provides a system for determining capillary pressure based on nuclear magnetic testing, see figure 1 , the device can be a server A1, t...

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Abstract

The invention provides a capillary pressure determination method and device based on a nuclear magnetic test. The method comprises the following steps: measuring nuclear magnetic test data of a capillary pressure region to be calculated; and generating the capillary pressure of the capillary pressure region to be calculated by utilizing the nuclear magnetic test data of the capillary pressure region to be calculated and a pre-established capillary pressure calculation model of a plurality of cores with different pore structure categories. The method provided by the invention is high in precision, and the capillary pressure can be obtained without carrying out a rock core capillary pressure test.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to the field of nuclear magnetic technology evaluation of pore structure, and in particular to a method and device for determining capillary pressure based on nuclear magnetic testing. Background technique [0002] Capillary pressure curve tests are often used in reservoir pore structure research, and the pore structure is evaluated by pore structure characteristic parameters. However, for relatively dense and low-permeability reservoirs, the mercury saturation of conventional mercury injection tests is generally low, and mercury injection curves cannot reflect mercury injection. Microscopic pore-throat features with high pressure. [0003] NMR is widely used to study the characteristics of pore structures. The current practice is to set the NMR relaxation time T 2 The spectrum is converted into a capillary pressure curve to study the pore structure. According to the NMR relax...

Claims

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Application Information

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IPC IPC(8): G01N24/08G01N15/08G06K9/62
CPCG01N24/081G01N15/088G01N15/08G06F18/241Y02A90/30
Inventor 张世铭张小军苟迎春王朴吴梁宇
Owner PETROCHINA CO LTD
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