Why is there so much coal, oil and natural gas on the earth? Now let's answer them one by one. The first talk is about how coal is formed. Coal is formed after a long period of geological action after the accumulation layer of plant remains in ancient times was buried underground. According to research, all plant remains can be converted into coal as long as they have the conditions to become coal. However, coal formed by lower plants has a small distribution range and a thin thickness, and is rarely used by people. Those coals that are widely distributed, large-scale and widely distributed are all formed by the remains of advanced plants (mainly the remains of ferns, conifers and some angiosperms in ancient times).
2. Formation of oil: Oil is mainly composed of hydrocarbons. It often exists in liquid or gas (natural gas) in the pores of rock formations; Sometimes it partially condenses into a solid state. Oil is the remains of ancient creatures, which are accumulated in lakes, seas or land and transformed by complex biological and chemical actions under the action of high temperature and high pressure. Oil is generated bit by bit in the stratum and floats in the stratum. Because of buoyancy, the oil point moves slowly up and down along the stratum or fault every year until it is stopped by the oil-tight closed stratum. When there are more and more oil points in this seal, an oil field is formed.
formation of natural gas: according to the formation mechanism, natural gas can be divided into two categories: organic gas and inorganic gas. Organic genetic gas refers to the dispersed sedimentary organic matter and combustible organic minerals (oil, coal and oil shale), which are mainly hydrocarbon gas formed by microbial degradation and pyrolysis during their diagenetic maturity. As far as the current research level is concerned, most of the natural gas found today belongs to organic genetic gas.
obviously, this is a very large type. According to the above description, according to the main factors of gas formation, organic gas can be further divided into biogenic gas (including diagenetic gas) and pyrolysis gas; The latter is the main body of organic gas, which can be further divided according to the different types of gas-forming organic matter: the natural gas formed by oil-forming organic matter (L ⅱ kerogen) and oil is called oil-type gas; The natural gas formed by type ⅲ kerogen and coal-forming organic matter in the process of coal-forming metamorphism is called coal-type gas.
This divides natural gas into four basic genetic types, namely biogenic gas, oil-based gas, coal-based gas and inorganic biogenic gas!
to sum up, the above are the main reasons for the production of coal, oil and natural gas. These three things are important strategic materials of our country, and we should pay special attention to protection so that our country can run unimpeded and freely to reach the other side of victory!