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A method for measuring gas-bearing porosity of shale

A measurement method and porosity technology, applied in the field of shale gas reserve prediction, can solve the problems of low shale porosity, small pore volume, system error, etc., and achieve accurate measurement results, accurate measurement of gas-bearing pore volume, and process The effect of step simplification

Active Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] The existing methods for indirectly measuring air-containing porosity have the following disadvantages. First, the existing methods are complicated and cannot directly measure air-containing porosity. It is necessary to measure porosity and water saturation first, and then calculate the air-containing porosity
Second, there are large errors in multiple measurements and numerical transfers; the heating distillation temperature and heating distillation time affect the water content test, and there are differences in the selection of porosity test methods. These experimental links have large systematic errors and accidental errors.
Third, shale has low porosity and small pore volume, and the appropriate test method and test conditions for shale porosity have not been optimized
Conventional porosity, water saturation measurement methods and test conditions are no longer suitable for shale gas reservoirs

Method used

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  • A method for measuring gas-bearing porosity of shale

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] Such as figure 1 Shown, a kind of shale gas-bearing porosity measuring method comprises the following steps:

[0024] 1) Sample preparation: Take shale without water soaking from the middle of the full-diameter core in time, cut it into a rectangle, specify the bedding direction according to the requirements, the mass is not less than 40g, and number the sample; prepare the formation salinity brine (density ρ), Or standard brine with a salinity of 50,000 for standby;

[0025] 2) Weigh the sample mass M on a one-ten-thousandth balance with the cut rectangular rock core 1 ; Vacuumize the rectangular rock core sample...

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Abstract

The invention discloses a method for measuring the gas-containing porosity of shale, which comprises the following steps: 1) sample preparation; timely take shale without water soaking from the middle of the full-diameter rock core, cut it into rectangles, and clarify the bedding direction and quality less than 40g, and carry out sample numbering; prepare stratum salinity brine, or standard brine of 50,000 salinity for standby; 2) weigh the sample quality with the cut rectangular core; vacuumize the rectangular core sample and fluid, and Absorb and saturate the fluid in the bedding direction, then completely soak in the liquid, and further absorb the liquid until the mass does not change; weigh the mass of the sample in the fluid, take out the completely saturated fluid core and suck the fluid on the rock surface, and then weigh it in the air Medium mass; calculate the air-containing pore volume and apparent volume; 3) measure the pore volume after dry distillation; 4) parameter calculation; calculate the air-containing porosity and total porosity. The invention can directly measure the gas-containing porosity, and the measurement result is accurate.

Description

technical field [0001] The invention relates to a shale gas reserve prediction technology, in particular to a method for measuring shale gas-containing porosity. Background technique [0002] The existing indirect methods for measuring air-containing porosity have the following disadvantages. First, the existing methods are complicated and cannot directly measure air-containing porosity. It is necessary to first measure porosity and water saturation, and then calculate the air-containing porosity. Second, there are large errors caused by multiple measurements and numerical transfers; the heating distillation temperature and heating distillation time affect the water content test, and there are differences in the selection of porosity test methods. These experimental links have large systematic errors and accidental errors. The third is that shale has low porosity and small pore volume, and the appropriate test methods and test conditions for shale porosity have not been opti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0893
Inventor 郭洪金杨文新郑爱维何建华周玉萍胡玫罗兵卢文涛黄志红
Owner CHINA PETROLEUM & CHEM CORP
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