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Shale porosity measurement method

A technology of shale porosity and measurement method, which is applied in the field of shale porosity measurement and can solve problems such as inaccurate measurement of shale porosity

Pending Publication Date: 2017-01-11
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the shortcoming that conventional rock porosity measurement methods cannot accurately measure shale porosity, and aim at the porosity measurement method of shale with nanoscale pores

Method used

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  • Shale porosity measurement method

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Experimental program
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Embodiment 1

[0018] Follow the steps below to perform a shale porosity measurement:

[0019] Step (1): Select a certain amount of massive shale samples, put the shale samples in a vacuum environment at 150°C for 24 hours, and weigh the dry weight M 1 (33.4588g).

[0020] Step (2): Vacuumize the shale for 4 hours (vacuum degree reaches 0.1MPa), pressurize and saturate 3% KCl solution for 48 hours, the saturation pressure is 100MPa, measure the weight M after saturation 2 (33.6540g)

[0021] Step (3): measure the density ρ of 3% KCl solution, concrete measuring method is: measure the 3% solution of certain amount volume three times (2.1ml, 3.9ml, 3.4ml) with graduated cylinder, weigh its quality respectively with balance 2.2563g, 4.0709g, 3.6045g), using the formula Get the density measured 3 times, take the average value to get the density of 3% KCl solution is 1.06g / cm 3 .

[0022] Step (4): Through the formula The pore volume of the obtained shale is 0.18cm 3 .

[0023] Step (5)...

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Abstract

The invention discloses a shale porosity measurement method with an aim to solve problems that conventional shale porosity measurement is low in precision, long in time consumption and uneconomical. The shale porosity measurement method includes: selecting a whole-piece to-be-measured shale sample, subjecting shale to vacuum pumping for 4 hours, heating to 150DEG C under the vacuum condition, taking out after 24 hours and weighing dry weight M1; adopting 3% of a KCl solution to perform pressure saturation for 48 hours, and weighing the weight M2 with a scale after the shale is saturated; measuring 3% of the KCl solution to be p in density and calculating porosity volume V1 of the sample (as is shown in the following formula) on the premise of Archimedes principle, placing the shale sample in a container with nail polish, and measuring the volume V2 of the shale sample; calculating the porosity of the sample as is shown in the following formula. With the method, influence of clay-bound water and crystal water on measurement precision of the porosity can be removed, whether the shale sample is regular or not is not required, the method is economic and practical in measurement of the porosity and high in operability.

Description

technical field [0001] The invention belongs to the technical field of methods for indoor measuring shale porosity in the fields of petroleum, geology and mining, and in particular relates to a method for measuring shale porosity. Background technique [0002] Shale porosity is an important basic parameter for understanding and evaluating oil and gas reservoirs. Shale has a high content of clay minerals and is rich in organic matter, making the pore structure of shale more complex than that of sandstone. The porosity is generally less than 10%. Conventional porosity measurement methods cannot be directly applied to shale porosity measurement. [0003] At present, the measurement ideas for rock porosity mainly focus on measuring the pore volume of rocks, and then measuring the total volume of rocks. There are two commonly used methods for measuring the pore volume of rocks: ① Pulverize the massive shale sample, and calculate the volume difference of the powder sample before ...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N5/02
CPCG01N5/02G01N15/0893
Inventor 白佳佳康毅力游利军李相臣许成元闫霄鹏陈益滨
Owner SOUTHWEST PETROLEUM UNIV
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