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Shale gas reservoir pore structure quantitative calculation method based on nuclear magnetic resonance

A nuclear magnetic resonance and quantitative calculation technology, applied in the direction of analysis by nuclear magnetic resonance, material analysis by resonance, measurement device, etc. Accurate results

Inactive Publication Date: 2018-06-15
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, for complex rock components and pore types in shale gas reservoirs, this value should not be a fixed value, that is, the difference in surface relaxation rate in different wetted pore component types of shale is not considered

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  • Shale gas reservoir pore structure quantitative calculation method based on nuclear magnetic resonance
  • Shale gas reservoir pore structure quantitative calculation method based on nuclear magnetic resonance
  • Shale gas reservoir pore structure quantitative calculation method based on nuclear magnetic resonance

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[0053] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0054] A method for quantitatively calculating the pore structure of shale gas reservoirs based on nuclear magnetic resonance, comprising the following steps:

[0055] Step 1, rock core collection;

[0056] Step 2, drill parallel samples, and carry out self-absorption oil and water NMR experimental measurements;

[0057] Drill a cylindrical shale oil and gas reservoir core with a diameter of 2.54 cm (or 3.81 cm) and a length greater than 6 cm; cut the core from the middle, and prepare a group of parallel samples with flat ends and similar lengths (the numbers of the two cores are respectively a, b); select core a to self-absorb brine (40000ppm Nacl solution), and another core b to self-absorb oil (dodecane); the core self-absorption time is 48 hours. ...

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Abstract

The invention discloses a shale gas reservoir pore structure quantitative calculation method based on nuclear magnetic resonance. The shale gas reservoir pore structure quantitative calculation methodcomprises the following steps: collecting cores; drilling parallel samples, carrying out oil and water self-adsorption nuclear magnetic resonance experiment measurement; contrastively analyzing the difference of a parallel sample oil and water nuclear magnetic resonance T2 spectrum, and determining the distribution of different wetting pore types on the nuclear magnetic resonance T2 spectrum; obtaining a shale gas reservoir full-pore distribution curve according to high-pressure pressurized mercury, nitrogen adsorption and carbon dioxide adsorption; furthermore, obtaining an intersection plate of pore diameters and corresponding T2 time; and according to the intersection plate of different pore types of pore diameters and corresponding T2 time, establishing a quantitative calculation model of the pore diameters according to the pore types. The method has the advantages that a shale gas reservoir pore full-pore distribution curve can be quantitatively calculated through the technology;simultaneously, the nuclear magnetism measurement is quick, simple and loss-free, and is higher in practicability by compared with high-pressure pressurized mercury, nitrogen adsorption and carbon dioxide adsorption; and compared with a conventional method, the calculation result is more accurate.

Description

technical field [0001] The invention relates to the technical field of shale gas reservoir pore structure evaluation, in particular to a nuclear magnetic resonance-based quantitative calculation method for the pore structure of shale gas reservoirs. Background technique [0002] Shale gas mainly refers to natural gas that exists in the pores or fractures of shale matrix in the adsorbed or free state. Shale gas is another important unconventional oil and gas resource after tight sandstone gas and coalbed methane. At present, the experimental methods for evaluating the pore structure of shale gas reservoirs mainly include: scanning electron microscope, high pressure mercury intrusion, nitrogen adsorption, carbon dioxide adsorption, nuclear magnetic resonance and other experiments; [0003] (1) Scanning electron microscopy, mercury injection, nitrogen adsorption, carbon dioxide adsorption [0004] Scanning electron microscopy combined with argon ion polishing technology can q...

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Application Information

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IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/088G01N24/081
Inventor 王亮贾玉泽杨琴琴黄林林谢韦峰朱明月
Owner SOUTHWEST PETROLEUM UNIV
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