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The intensities of the standardized vertical sections from Experiment 1 are plotted in Figure 4. On the other hand, there are many crystal nucleation processes that take place during this process. However, we should also note that the area imaged in a vertical slice is three times larger than the area imaged in a horizontal slice.

Therefore, since there is more water in the vertical section, the conversion of the small amount of water in the gap does not force a significant decrease in the intensity of the image, and the nucleation that occurs in the vertical section appears more uniform than that that occurs in the horizontal section. Obviously, in order to observe the spatial inhomogeneity of hydrate formation in a smaller slice area, we need to supervise or observe the hydrate formation process more precisely.

The ratio between the mass quantity of complete water and sand.

Saturated water bed (complete void filling.

grains of sand) were found to be milliliters of grams. Thus, the bed consists of 2 grams.

The initial water content of the sand is , , and milliliters.

Equivalent to initial water saturation, sw, i, 100, 75, 50 beds, 25.

The volume of water and the mass of sand are in proportion completely.

Water-saturated bed (the void between complete fills.

Sand particles) were found to be ml g. In this way, the bed is composed of 2 g and ml of initial water sand.

Equivalent to the initial oil-water saturation, software, a, 75, 100, 50, and hospital beds.

There are three main options for combustible ice mining.

The first is the pyrolysis method. Taking advantage of the decomposition of "combustible ice" when heated, it decomposes methane vapor from a solid state. But the difficulty with this method is that it is not easy to collect.

The porous media of the seafloor are not concentrated in a single "patch" or a large block of rock, but are more evenly distributed. How to lay the pipeline and collect it efficiently is a problem that needs to be solved urgently.

The second option is the antihypertensive method. Some scientists have proposed burying nuclear waste in the ground and using the radiation effect to decompose it. However, they all face the same problem of laying out pipes and collecting them efficiently as the pyrolysis method.

The third option is the "replacement method". Studies have shown that liquefaction of CO2 (which is easy to achieve) and inject it into the ocean below 1,500 meters (it doesn't have to be to the bottom of the ocean) produces carbon dioxide hydrates, which have a greater gravity than seawater and then sink to the bottom of the sea. If CO2 is injected into a methane hydrate reservoir on the seafloor, it is possible to "squeeze" the methane molecules in the methane hydrate and thus displace it, because CO2 is more prone to hydrate than methane.

The basic conditions for preservation: first of all, the temperature should not be too high, 0 10 is appropriate, the highest limit is about 20, and then it will be decomposed. More than 30 atmospheres at 20 degrees Celsius.

The term "combustible ice" is louder and more common in China than internationally. In fact, the term "combustible ice" is a relatively popular science, which means that it is rarely used in international professional literature. The reason why it is said is that its English name is natural gas hydrate or natural gas, because the pure natural gas hydrate is white in appearance, shaped like ice or snow, or large pieces of ice, or speckled spots scattered in the sediment, so it is very popular and figuratively called "combustible ice", so it is called because it is pure.

How is it structured? Natural gas hydrate is a molecule of natural gas, we know that natural gas is mainly methane, natural gas molecules and water molecules are formed under special temperature and pressure conditions, low temperature and high pressure, of course, there are specific places to form such a solid state, strictly speaking, it is a cage inclusion complex, and it is not a hydrate or a compound, it is a number of water molecules around a methane molecule under unique temperature and pressure conditions, we call it cage inclusion complex, which is the most standardized and scientific name.

This kind of thing is formed by natural gas, water, and medium, and they form hydrates in the pores of the medium, of course, the external conditions are low temperature and high pressure. Don't understand that gas hydrate is combustible ice and ice, which is basically invisible to the naked eye.

Combustible ice is a solid compound that combines flammable gas and water, and is called "combustible ice" because of its similar appearance to ice. There are two ways for this combustible ice to form: one is that the temperature of the ore layer drops due to the cold climate, and the high pressure of the formation makes the hydrocarbons originally dispersed in the earth's crust and the water in the earth's crust form a gas-water combined ore layer.

Second, because the remains left behind by the death of a large number of organisms and microorganisms in the ocean continue to be deposited on the seabed, they quickly decompose into organic gases such as methane and ethane, so that they drill into the micropores of sedimentary rocks with loose structures on the seabed and form compounds with water.

Combustible ice accumulates year after year, forming deposits that stretch thousands to tens of thousands of miles. It contains 200 cubic meters of combustible gas per cubic meter, and its proven reserves are hundreds of times larger than the reserves of coal, oil and gas combined.

The first thing that is certain is that combustible ice is a mixture.

Because combustible ice is composed of methane, ethane, propane, butane and other congeners and water.

Even the methane hydrate in combustible ice is a mixture. Because it is a non-stoichiometric substance.

If a part of combustible ice is determined to have a mass ratio of 1 8 to water, it is not certain that it is pure, because not all methane to water ratios are 1 8.

Combustible ice, theoretically pure, is chemically CH4, but there are very few pure substances under natural conditions, and it must contain some impurities.