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A device and method for distinguishing matrix pores and micro-fractures in shale reservoirs

A shale reservoir and micro-fracture technology, applied in the field of rock physics, can solve the problem of accurately distinguishing matrix pores and micro-fractures

Active Publication Date: 2019-09-06
INST OF MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no method that can accurately distinguish the characteristics of matrix pores and micro-fractures

Method used

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  • A device and method for distinguishing matrix pores and micro-fractures in shale reservoirs
  • A device and method for distinguishing matrix pores and micro-fractures in shale reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] combine figure 1 As shown, in one embodiment of the present invention, a device for distinguishing matrix pores and microfractures in shale reservoirs includes an analysis control unit, a temperature control unit, an ion measurement unit and a liquid level control unit. The temperature control unit is used to control the constant temperature of the experimental process, including a constant temperature chamber 1 , a constant temperature tank 5 and a temperature sensor 10 set in the constant temperature chamber 1 . The ion measuring unit includes an airtight container located in the constant temperature tank 5 and containing the sample mixture, and a conductivity meter 3 located in the constant temperature chamber 1 and measuring the conductivity of the sample mixture; the temperature sensor 10 is arranged in the airtight container. The liquid level control unit is arranged in the constant temperature tank 5, including the scale tube 2 connected to the lower end of the a...

Embodiment 2

[0046] A method for distinguishing matrix pores and micro-fractures in shale reservoirs using the device of Embodiment 1, comprising the following steps:

[0047] 1) pulverize the shale sample into particles, and then sieve the particles with a 6-mesh sieve to obtain sample particles with a particle size of 3350 μm;

[0048] 2) drying the sample particles at 105°C so that the quality does not change;

[0049] 3) Take 10g of dried sample particles and 200mL of distilled water and add them to a 250mL glass container respectively, the salt ions in the sample particles will be dispersed in the water to obtain a sample mixture; the lower end of the conductivity meter is inserted into the sample through the sealing cover and mixed liquid, and keep a distance of 4-6cm from the bottom of the glass container;

[0050] 4) Turn on the magnetic stirrer to stir for 2 minutes, and then measure the initial conductivity of the sample mixture; after the stirring, measure the initial conductiv...

Embodiment 3

[0053] The method for distinguishing matrix pores and micro-fractures in shale reservoirs is the same as that in Example 2, other steps remain unchanged, and only step 1) is changed, such as:

[0054] 1) pulverize the shale sample into particles, and then sieve the particles with an 8-mesh sieve to obtain sample particles with a particle size of 2360 μm;

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Abstract

The invention discloses a device for distinguishing matrix pores from microcracks of a shale reservoir. The device comprises an analysis control unit, a temperature control unit, an ion measuring unit and a liquid level control unit. The invention also discloses a method for distinguishing the characteristics of the matrix pores from those of the microcracks by using the device. According to the device disclosed by the invention, evaporation capacity of liquid in a closed container and the influence of the temperature on ionic diffusion can be efficiently controlled by adopting the liquid level control unit and the temperature control unit; in addition, the change of electrical conductivity of shale particles with different particle sizes in a mixed solution is measured by the ion measuring unit in real time; by use of the device and the method disclosed by the invention, the characteristics of the matrix pores and the microcracks of the shale can be effectively evaluated according to the change of the measured electrical conductivity along with time. The invention provides a novel experimental testing technique and method for porous structure analysis of the shale reservoir, and has potential application value in the fields of evaluation of the shale reservoir, production prediction, postfrac evaluation and the like.

Description

technical field [0001] The invention belongs to the technical field of petrophysics, and in particular relates to a device and a method for distinguishing matrix pores and micro-cracks in shale reservoirs. Background technique [0002] Shale gas is a kind of unconventional oil and gas resource with huge reserves and clean, and it has become one of the important strategic energy sources in my country. Shale reservoirs have the characteristics of dual pores and dual media, and matrix pores and micro-fractures are developed at the same time, and the pore structure is complex, which brings difficulties to the evaluation of shale reservoirs. At the same time, matrix pores and micro-fractures have significantly different effects on the occurrence and seepage of shale gas, and it is necessary to study them separately. However, there is no method that can accurately distinguish the characteristics of matrix pores and microfractures. The salinity of the return fluid after fracturin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N15/08
Inventor 杨柳张旭辉鲁晓兵葛洪魁江昀
Owner INST OF MECHANICS CHINESE ACAD OF SCI
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