Method and device for determining saturation exponent of tight sandstone

A technology of tight sandstone and saturation, applied in the fields of earthwork drilling, electrical digital data processing, special data processing applications, etc., can solve the problems of resistivity influence, long experiment period and difficulty

Active Publication Date: 2016-04-06
PETROCHINA CO LTD
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Problems solved by technology

However, the porosity and permeability of tight cores will be much lower than those of conventional cores, and rock properties and pore structures will affect the ...

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  • Method and device for determining saturation exponent of tight sandstone
  • Method and device for determining saturation exponent of tight sandstone
  • Method and device for determining saturation exponent of tight sandstone

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[0070] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0071] The inventor considers that in the field of logging technology, nuclear magnetic resonance is currently the only logging technology that can provide pore structure information. The rock NMR transverse relaxation time T2 spectrum contains a wealth of pore structure information. The NMR transverse relaxation time T2 spectrum of the rock saturated with water reflects the overall pore structure information of the rock. The NMR transverse relaxation time T2 of different water saturation states Spectra reflect pore structure information such as throats of different g...

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Abstract

The invention discloses a method and a device for determining saturation exponent of tight sandstone. The method comprises: according to nuclear magnetic resonance transverse relaxation time T2 spectrum of a core in a water saturation state and nuclear magnetic resonance transverse relaxation time T2 spectrum of cores in different water saturation states after different centrifugal forces are applied, determining geometric mean value of the nuclear magnetic resonance transverse relaxation time T2, the geometric mean value of the nuclear magnetic resonance transverse relaxation time T2 of the cores in different water saturation states after different centrifugal forces are applied on the cores, and water saturation of the cores after different centrifugal forces are applied; and according to the geometric mean value of the nuclear magnetic resonance transverse relaxation time T2 of the core in a water saturation state, and the geometric mean value of the nuclear magnetic resonance transverse relaxation time T2 of the cores in different water saturation states after different centrifugal forces are applied, and the water saturation of the cores after different centrifugal forces are applied, determining saturation exponent of the cores. The method and the device can accurately and efficiently determine the saturation exponent of tight sandstones.

Description

technical field [0001] The invention relates to the technical field of well logging in petroleum geological exploration, in particular to a method and a device for determining the tight sandstone saturation index. Background technique [0002] In well logging interpretation, the comprehensive analysis of oil, gas and water in the reservoir is usually performed on the basis of Archie's formula. Reasonable selection of interpretation parameters is the core content of the work. Archie's formula contains four important parameters a, b, m, and n. Usually, a and b are very close to 1, so they generally default to 1. Both m and n have their own physical meanings. m is called the pore structure index, which depends on the pore structure of the formation; n is called the saturation index, which mainly reflects the impact of the distribution of oil, gas and water in the rock pores on the rock resistance. The influence of saturation rate, and the distribution of oil, gas, and water in...

Claims

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Application Information

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IPC IPC(8): E21B49/00G01N24/08G06F19/00
CPCE21B49/00G01N24/08G16Z99/00
Inventor 徐红军周灿灿俞军李潮流胡法龙李长喜李霞刘忠华
Owner PETROCHINA CO LTD
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